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Prof. Dr. Manel Soria
The School of Industrial, Aerospace and Audiovisual Engineering of Terrassa (ESEIAAT), Department of Physics, Universitat Politècnica de Catalunya (UPC), C. Colom 11, 08222 Terrassa, Spain.

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Research Keywords & Expertise

0 Heat Transfer
0 Turbulence
0 Active flow control
0 Computational Fluid Dynamics
0 atmospheric dynamics

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Heat Transfer
Turbulence
Computational Fluid Dynamics
Synthetic jets

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Article
Published: 07 May 2021 in Flow, Turbulence and Combustion
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The interaction of turbulent flows with the external structure of ground vehicles generates uncomfortable noise and a lot of attention is devoted to find new mechanisms for its suppression. The present work is concerned with open cavity flows, very often found in the automotive industry. A three-dimensional rectangular very wide open cavity with aspect ratio \(L/D=4\) at Reynolds number \(Re_D=5000\) and Mach number \(M=0.1\) is considered. The passive control technique is based on eight different geometrical modifications: the length of the cavity, the radius of the trailing, leading and bottom edges and the difference in heights between the left and right wall of the cavity. Wall-resolved Large Eddy Simulations (LES) are used to obtain the flow fields and a post-process based on Curle’s analogy is applied to evaluate the acoustic radiation and the effectiveness of the control mechanisms. The results show that the modifications on the trailing edge are the most effective to control the flow. They allow to reduce the pressure fluctuations produced by the recirculation confined inside the cavity and the abrupt ejection of the flow at the trailing edge. As a consequence, the overall sound pressure level can be decreased up to 9 dB.

ACS Style

Rocio Martin; Manel Soria; Ivette Rodriguez; Oriol Lehmkuhl. On the Flow and Passive Noise Control of an Open Cavity at Re = 5000. Flow, Turbulence and Combustion 2021, 1 -26.

AMA Style

Rocio Martin, Manel Soria, Ivette Rodriguez, Oriol Lehmkuhl. On the Flow and Passive Noise Control of an Open Cavity at Re = 5000. Flow, Turbulence and Combustion. 2021; ():1-26.

Chicago/Turabian Style

Rocio Martin; Manel Soria; Ivette Rodriguez; Oriol Lehmkuhl. 2021. "On the Flow and Passive Noise Control of an Open Cavity at Re = 5000." Flow, Turbulence and Combustion , no. : 1-26.

Research letter
Published: 26 April 2021 in Geophysical Research Letters
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In March 2020, a convective storm erupted at planetographic latitude 76°N in the southern flank of Saturn’s long‐lived hexagonal wave. The storm reached a zonal size of 4,500 km and developed a tail extending zonally 33,000 km. Two new short‐lived storms erupted in May in the hexagon edge. These storms formed after the convective storms that took place in 2018 in nearby latitudes. There were no noticeable changes in the zonal profile of Saturn's polar winds in 2018–2020. Measurements of the longitude position of the vertices of the hexagon throughout this period yield a value for its period of rotation equal to that of System III of radio rotation measured at the time of Voyagers. We report changes in the hexagon clouds related to the activity of the storms. Our study reinforces the idea that Saturn’s hexagon is a well‐rooted structure with a possible direct relationship with the bulk rotation of the planet.

ACS Style

A. Sánchez‐Lavega; E. García‐Melendo; T. del Río‐Gaztelurrutia; R. Hueso; A. Simon; M. H. Wong; K. Ahrens‐Velásquez; M. Soria; T. Barry; C. Go; C. Foster. Interaction of Saturn’s Hexagon With Convective Storms. Geophysical Research Letters 2021, 48, 1 .

AMA Style

A. Sánchez‐Lavega, E. García‐Melendo, T. del Río‐Gaztelurrutia, R. Hueso, A. Simon, M. H. Wong, K. Ahrens‐Velásquez, M. Soria, T. Barry, C. Go, C. Foster. Interaction of Saturn’s Hexagon With Convective Storms. Geophysical Research Letters. 2021; 48 (8):1.

Chicago/Turabian Style

A. Sánchez‐Lavega; E. García‐Melendo; T. del Río‐Gaztelurrutia; R. Hueso; A. Simon; M. H. Wong; K. Ahrens‐Velásquez; M. Soria; T. Barry; C. Go; C. Foster. 2021. "Interaction of Saturn’s Hexagon With Convective Storms." Geophysical Research Letters 48, no. 8: 1.

Journal article
Published: 09 April 2021 in Journal of Geophysical Research: Planets
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Jupiter’s Great Red Spot (GRS), a giant anticyclone, is the largest and longest‐lived of all the vortices observed in planetary atmospheres. During its history, the GRS has shrunk to half its size since 1879, and encountered many smaller anticyclones and other dynamical features that interacted in a complex way. In 2018‐2020, while having a historically small size, its structure and even its survival appeared to be threatened when a series of anticyclones moving in from the east tore off large fragments of the red area and distorted its shape. In this work we report observations of the dynamics of these interactions and show that as a result the GRS increased its internal rotation velocity, maintaining its vorticity but decreasing its visible area, and suffering a transient change in its otherwise steady 90‐day oscillation in longitude. From a radiative transfer analysis and numerical simulations of the dynamics we show that the interactions affected the upper cloud tops of the GRS. We argue that the intense vorticity of the GRS, together with its larger size and depth compared to the interacting vortices, guarantees its long lifetime.

ACS Style

A. Sánchez‐Lavega; A. Anguiano‐Arteaga; P. Iñurrigarro; E. Garcia‐Melendo; J. Legarreta; R. Hueso; J. F. Sanz‐Requena; S. Pérez‐Hoyos; I. Mendikoa; M. Soria; J. F. Rojas; M. Andrés‐Carcasona; A. Prat‐Gasull; I. Ordoñez‐Extebarria; J. H. Rogers; C. Foster; S. Mizumoto; A. Casely; C. J. Hansen; G. S. Orton; T. Momary; G. Eichstädt. Jupiter’s Great Red Spot: Strong Interactions With Incoming Anticyclones in 2019. Journal of Geophysical Research: Planets 2021, 126, 1 .

AMA Style

A. Sánchez‐Lavega, A. Anguiano‐Arteaga, P. Iñurrigarro, E. Garcia‐Melendo, J. Legarreta, R. Hueso, J. F. Sanz‐Requena, S. Pérez‐Hoyos, I. Mendikoa, M. Soria, J. F. Rojas, M. Andrés‐Carcasona, A. Prat‐Gasull, I. Ordoñez‐Extebarria, J. H. Rogers, C. Foster, S. Mizumoto, A. Casely, C. J. Hansen, G. S. Orton, T. Momary, G. Eichstädt. Jupiter’s Great Red Spot: Strong Interactions With Incoming Anticyclones in 2019. Journal of Geophysical Research: Planets. 2021; 126 (4):1.

Chicago/Turabian Style

A. Sánchez‐Lavega; A. Anguiano‐Arteaga; P. Iñurrigarro; E. Garcia‐Melendo; J. Legarreta; R. Hueso; J. F. Sanz‐Requena; S. Pérez‐Hoyos; I. Mendikoa; M. Soria; J. F. Rojas; M. Andrés‐Carcasona; A. Prat‐Gasull; I. Ordoñez‐Extebarria; J. H. Rogers; C. Foster; S. Mizumoto; A. Casely; C. J. Hansen; G. S. Orton; T. Momary; G. Eichstädt. 2021. "Jupiter’s Great Red Spot: Strong Interactions With Incoming Anticyclones in 2019." Journal of Geophysical Research: Planets 126, no. 4: 1.

Journal article
Published: 24 February 2021 in Acta Astronautica
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Space missions need software in order to be aware of the occurrence of geometric events in different phases of their project lifecycle. However, current software packages that provide capabilities to search for geometric events might lack desirable software qualities such as extensibility and reusability, and some conflate the definition of events with the search for the same. In order to improve the state of the art, we propose a framework named Tychonis that, via metamodeling techniques and conscious use of object-oriented design best practices, (i) can integrate with current and future mission software, (ii) enables end-users to extend opportunities and search algorithms without modifying the tools that use the framework, and (iii) promotes the cross-mission reusability of the framework and its extensions. These attributes make it less costly for projects to develop software to search for geometric events. Tychonis is provided as a software library that allows missions to add their own data structures and constructs to the framework, including geometric event types and search algorithms. This is accomplished with Tychonis’ use of the Eclipse Modeling Framework (EMF) to capture its metamodel, which enables the generation of Java classes that represent built-in or user-developed Tychonis constructs. In the present paper, we elaborate on the impetus for the development of Tychonis, show its proposed design and use, and discuss growth opportunities for future consideration.

ACS Style

M. Llopis; M. Soria; X. Franch. Tychonis: A model-based approach to define and search for geometric events in space. Acta Astronautica 2021, 183, 319 -329.

AMA Style

M. Llopis, M. Soria, X. Franch. Tychonis: A model-based approach to define and search for geometric events in space. Acta Astronautica. 2021; 183 ():319-329.

Chicago/Turabian Style

M. Llopis; M. Soria; X. Franch. 2021. "Tychonis: A model-based approach to define and search for geometric events in space." Acta Astronautica 183, no. : 319-329.

Journal article
Published: 30 October 2020 in International Journal of Heat and Mass Transfer
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Free-stream turbulence is present in many engineering applications and is known to affect both bluff body aerodynamics and heat transfer. In this work, its effects on the heat transfer and the near wake behind a sphere are studied. To do this, direct and large-eddy simulations of the flow at the moderate Reynolds numbers of Re=1000and Re=104,with levels of incoming turbulence up to 10%and a length scale of O(D),Dbeing the sphere diameter, are performed. At the Reynolds numbers under consideration, significant changes are observed. Incoming turbulence delays the separation of the laminar boundary layer from the sphere, while at the same time the drag coefficient and the Nusselt number are increased. The incoming level of turbulence also increases the momentum transfer from the surrounding fluid and energises the separated shear-layer. As a consequence, there is a shrinking of the recirculation zone which intensifies the heat transfer from the sphere and thus, the Nusselt number and its fluctuations, especially in the rear zone of the sphere. It is shown that free-stream turbulence increases the turbulent heat flux in the wake, with a larger entrainment of colder fluid from the surroundings, thus producing a faster decay of the temperature at larger levels of turbulence intensity.

ACS Style

I. Rodriguez; O. Lehmkuhl; M. Soria. On the effects of the free-stream turbulence on the heat transfer from a sphere. International Journal of Heat and Mass Transfer 2020, 164, 120579 .

AMA Style

I. Rodriguez, O. Lehmkuhl, M. Soria. On the effects of the free-stream turbulence on the heat transfer from a sphere. International Journal of Heat and Mass Transfer. 2020; 164 ():120579.

Chicago/Turabian Style

I. Rodriguez; O. Lehmkuhl; M. Soria. 2020. "On the effects of the free-stream turbulence on the heat transfer from a sphere." International Journal of Heat and Mass Transfer 164, no. : 120579.

Journal article
Published: 20 October 2020 in Sensors
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This paper analyzes the behavior of a miniature 3D wind sensor designed for Mars atmosphere. The sensor is a spherical structure of 10 mm diameter divided in four sectors. By setting all the sectors to constant temperature, above that of the air, the 3D wind velocity vector can be measured. Two sets of experiments have been performed. First, an experimental campaign made under typical Mars conditions at the Aarhus Wind Tunnel Simulator is presented. The results demonstrate that both wind speed and angle can be efficiently measured, using a simple inverse algorithm. The effect of sudden wind changes is also analyzed and fast response times in the range of 0.7 s are obtained. The second set of experiments is focused on analyzing the performance of the sensor under extreme Martian wind conditions, reaching and going beyond the Dust Devil scale. To this purpose, both high-fidelity numerical simulations of fluid dynamics and heat transfer and experiments with the sensor have been performed. The results of the experiments, made for winds in the Reynolds number 1000–2000 range, which represent 65–130 m/s of wind speed under typical Mars conditions, further confirm the simulation predictions and show that it will be possible to successfully measure wind speed and direction even under these extreme regimes.

ACS Style

Manuel Domínguez-Pumar; Lukasz Kowalski; Vicente Jiménez; Ivette Rodríguez; Manel Soria; Sandra Bermejo; Joan Pons-Nin. Analyzing the Performance of a Miniature 3D Wind Sensor for Mars. Sensors 2020, 20, 5912 .

AMA Style

Manuel Domínguez-Pumar, Lukasz Kowalski, Vicente Jiménez, Ivette Rodríguez, Manel Soria, Sandra Bermejo, Joan Pons-Nin. Analyzing the Performance of a Miniature 3D Wind Sensor for Mars. Sensors. 2020; 20 (20):5912.

Chicago/Turabian Style

Manuel Domínguez-Pumar; Lukasz Kowalski; Vicente Jiménez; Ivette Rodríguez; Manel Soria; Sandra Bermejo; Joan Pons-Nin. 2020. "Analyzing the Performance of a Miniature 3D Wind Sensor for Mars." Sensors 20, no. 20: 5912.

Review article
Published: 17 September 2019 in International Journal of Aeroacoustics
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The present work focuses on the study of noise generation and radiation of an infinite open three-dimensional cavity at low Mach number with laminar upstream conditions that is of interest to understand noise generation mechanisms in wall-bounded separated flows. A particular feature of this configuration is the oscillatory mode: shear layer mode or wake mode. For the parameters considered in the present study it is seen that while in shear layer mode the flow shows a two-dimensional behavior, in the wake mode the flow is three-dimensional, resulting in significantly different sound sources. The influence of the acoustic feedback mechanism in the shear layer mode has also been investigated comparing the results between different momentum thickness values at the cavity inlet. This paper presents results of sound radiated by a three-dimensional infinite open cavity with aspect ratio L/D = 4 at Reynolds number based on the cavity depth of ReD = 1500 and Mach number of M = 0.15, both for shear layer (L/θ = 67) and wake (L/θ = 84) oscillation modes. To do so, Curle integral evaluated as a post-process of an incompressible solution will be used. The results are compared with the resulting Curle post-process of a two-dimensional incompressible simulation.

ACS Style

Rocio Martin; Manel Soria; Oriol Lehmkuhl; Andrey Gorobets; Alexey Duben. Noise radiated by an open cavity at low Mach number: Effect of the cavity oscillation mode. International Journal of Aeroacoustics 2019, 18, 647 -668.

AMA Style

Rocio Martin, Manel Soria, Oriol Lehmkuhl, Andrey Gorobets, Alexey Duben. Noise radiated by an open cavity at low Mach number: Effect of the cavity oscillation mode. International Journal of Aeroacoustics. 2019; 18 (6-7):647-668.

Chicago/Turabian Style

Rocio Martin; Manel Soria; Oriol Lehmkuhl; Andrey Gorobets; Alexey Duben. 2019. "Noise radiated by an open cavity at low Mach number: Effect of the cavity oscillation mode." International Journal of Aeroacoustics 18, no. 6-7: 647-668.

Journal article
Published: 13 February 2019 in International Journal of Heat and Fluid Flow
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Direct numerical simulation and large-eddy simulation have been performed for a heated sphere at Reynolds numbers of Re=1000 and Re=104, respectively. The Prandtl number for both simulations has been Pr=0.7. Measurements of the local and average Nusselt number are performed and compared with literature available experimental results. Average and front stagnation point Nusselt numbers increase with the Reynolds number, while the minimum value moves towards the sphere apex as the flow enters the sub-critical regime. Differences in both viscous and thermal boundary layers are observed, while the shape factor at Reynolds number Re=104 behaves similarly to that observed in circular cylinders at comparable Reynolds numbers. It is shown that as the Reynolds number increases, the increase in turbulent kinetic energy promotes the entrainment of irrotational flow thus enhancing the temperature mixing in the zone. The near wake, between 5 ≤ x/D ≤ 15, spreads at a faster rate at Re=1000 with a slope close to x/D1/2, while at Re=104 it follows a trend close to x/D1/3.

ACS Style

I. Rodriguez; O. Lehmkuhl; M. Soria; S. Gómez; M. Domínguez-Pumar; L. Kowalski. Fluid dynamics and heat transfer in the wake of a sphere. International Journal of Heat and Fluid Flow 2019, 76, 141 -153.

AMA Style

I. Rodriguez, O. Lehmkuhl, M. Soria, S. Gómez, M. Domínguez-Pumar, L. Kowalski. Fluid dynamics and heat transfer in the wake of a sphere. International Journal of Heat and Fluid Flow. 2019; 76 ():141-153.

Chicago/Turabian Style

I. Rodriguez; O. Lehmkuhl; M. Soria; S. Gómez; M. Domínguez-Pumar; L. Kowalski. 2019. "Fluid dynamics and heat transfer in the wake of a sphere." International Journal of Heat and Fluid Flow 76, no. : 141-153.

Journal article
Published: 02 November 2018 in International Journal of Thermal Sciences
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Synthetic jets are produced by the oscillatory movement of a membrane inside a cavity, causing the fluid to enter and leave through a small orifice. The present study is focused on investigating the cooling capabilities of a synthetic jet enclosed between two parallel isothermal plates with an imposed temperature difference. The unsteady three-dimensional Navier-Stokes equations have been solved for a range of Reynolds numbers from 50 to 1000 using time-accurate numerical simulations. A detailed model based on an Arbitrary Lagrangian-Eulerian (ALE) formulation is used to account for the movement of the actuator membrane. All the resulting flows are inherently three-dimensional and dominated by two major vortices, which find their counterparts inside the actuator cavity. A new structure, which is not found in open cavities, appears as an interaction of the synthetic jet flow with the bottom wall and results in a change on the jet's heat transfer mechanisms. Analysis of the outlet temperature has shown that assuming a uniform profile is reasonable if the Reynolds number is high enough, however, the outlet jet temperature is significantly higher than the cold plate temperature. Finally, this study proposes correlations for the heat transfer at the hot wall and the outlet temperature with the Reynolds number, which can be used to account for the cavity effects without the computationally expensive ALE model.

ACS Style

Arnau Miró; M. Soria; J.C. Cajas; I. Rodríguez. Numerical study of heat transfer from a synthetic impinging jet with a detailed model of the actuator membrane. International Journal of Thermal Sciences 2018, 136, 287 -298.

AMA Style

Arnau Miró, M. Soria, J.C. Cajas, I. Rodríguez. Numerical study of heat transfer from a synthetic impinging jet with a detailed model of the actuator membrane. International Journal of Thermal Sciences. 2018; 136 ():287-298.

Chicago/Turabian Style

Arnau Miró; M. Soria; J.C. Cajas; I. Rodríguez. 2018. "Numerical study of heat transfer from a synthetic impinging jet with a detailed model of the actuator membrane." International Journal of Thermal Sciences 136, no. : 287-298.

Journal article
Published: 01 August 2017 in Chinese Journal of Aeronautics
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The world airport network (WAN) is one of the networked infrastructures that shape today's economic and social activity, so its resilience against incidents affecting the WAN is an important problem. In this paper, the robustness of air route networks is extended by defining and testing several heuristics to define selection criteria to detect the critical nodes of the WAN. In addition to heuristics based on genetic algorithms and simulated annealing, custom heuristics based on node damage and node betweenness are defined. The most effective heuristic is a multi-attack heuristic combining both custom heuristics. Results obtained are of importance not only for advance in the understanding of the structure of complex networks, but also for critical node detection.Peer ReviewedPostprint (author's final draft

ACS Style

Manel Soria; Oriol Lordan; José María Sallan. Heuristics of node selection criteria to assess robustness of world airport network. Chinese Journal of Aeronautics 2017, 30, 1473 -1480.

AMA Style

Manel Soria, Oriol Lordan, José María Sallan. Heuristics of node selection criteria to assess robustness of world airport network. Chinese Journal of Aeronautics. 2017; 30 (4):1473-1480.

Chicago/Turabian Style

Manel Soria; Oriol Lordan; José María Sallan. 2017. "Heuristics of node selection criteria to assess robustness of world airport network." Chinese Journal of Aeronautics 30, no. 4: 1473-1480.

Journal article
Published: 01 December 2010 in Computers & Fluids
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ACS Style

F. Xavier Trias; R.W.C.P. Verstappen; Andrey Gorobets; Manuel Soria; Assensi Oliva. Parameter-free symmetry-preserving regularization modeling of a turbulent differentially heated cavity. Computers & Fluids 2010, 39, 1815 -1831.

AMA Style

F. Xavier Trias, R.W.C.P. Verstappen, Andrey Gorobets, Manuel Soria, Assensi Oliva. Parameter-free symmetry-preserving regularization modeling of a turbulent differentially heated cavity. Computers & Fluids. 2010; 39 (10):1815-1831.

Chicago/Turabian Style

F. Xavier Trias; R.W.C.P. Verstappen; Andrey Gorobets; Manuel Soria; Assensi Oliva. 2010. "Parameter-free symmetry-preserving regularization modeling of a turbulent differentially heated cavity." Computers & Fluids 39, no. 10: 1815-1831.

Book chapter
Published: 09 August 2010 in Lecture Notes in Computational Science and Engineering
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Direct numerical simulation (DNS) of incompressible flows is an essential tool for improving the understanding of the physics of turbulence and for the development of better turbulence models. The Poisson equation, the main bottleneck from a parallel point of view, usually also limits its applicability for complex geometries. In this context, efficient and scalable Poisson solvers on fully-3D geometries are of high interest.In our previous work, a scalable algorithm for Poisson equation was proposed. It performed well on both small clusters with poor network performance and supercomputers using efficiently up to a thousand of CPUs. This algorithm named Krylov-Schur-Fourier Decomposition (KSFD) can be used for problems in parallelepipedic 3D domains with structured meshes and obstacles can be placed inside the flow. However, since a FFT decomposition is applied in one direction, mesh is restricted to be uniform and obstacles to be 2D shapes extruded along this direction.The present work is devoted to extend the previous KSFD algorithm to eliminate these limitations. The extension is based on a two-level Multigrid (MG) method that uses KSFD as a solver for second level. The algorithm is applied for a DNS of a turbulent flow in a channel with wall-mounted cube. Illustrative results at Re τ = 590 (based on the cube height and the bulk velocity Re h = 7235) are shown.

ACS Style

Andrey Gorobets; F. Xavier Trias; Manuel Soria; Carlos-David Perez-Segarra; Assensi Oliva. From extruded-2D to fully-3D geometries for DNS: a Multigrid-based extension of the Poisson solver. Lecture Notes in Computational Science and Engineering 2010, 74, 219 -226.

AMA Style

Andrey Gorobets, F. Xavier Trias, Manuel Soria, Carlos-David Perez-Segarra, Assensi Oliva. From extruded-2D to fully-3D geometries for DNS: a Multigrid-based extension of the Poisson solver. Lecture Notes in Computational Science and Engineering. 2010; 74 ():219-226.

Chicago/Turabian Style

Andrey Gorobets; F. Xavier Trias; Manuel Soria; Carlos-David Perez-Segarra; Assensi Oliva. 2010. "From extruded-2D to fully-3D geometries for DNS: a Multigrid-based extension of the Poisson solver." Lecture Notes in Computational Science and Engineering 74, no. : 219-226.

Book chapter
Published: 09 August 2010 in Lecture Notes in Computational Science and Engineering
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In this paper a parallel direct Poisson solver for DNS simulation of turbulent flows statistically homogeneous in one spatial direction is presented. It is based on a Fourier diagonalization and a Schur decomposition on the spanwise and streamwise directions respectively. Numerical experiments carried out in order to test the robustness and efficiency of the algorithm are presented. This solver is being used for a DNS of a turbulent flow around a circular cylinder at Re = 1 ×104, the size of the required mesh is about 104 M elements and the discrete Poisson equation derived is solved in less than one second of CPU time using 720 CPUs of Marenostrum supercomputer.

ACS Style

Ricard Borrell; Oriol Lehmkuhl; F. Xavier Trias; Manuel Soria; Assensi Oliva. Parallel direct Poisson solver for DNS of complex turbulent flows using Unstructured Meshes. Lecture Notes in Computational Science and Engineering 2010, 74, 227 -234.

AMA Style

Ricard Borrell, Oriol Lehmkuhl, F. Xavier Trias, Manuel Soria, Assensi Oliva. Parallel direct Poisson solver for DNS of complex turbulent flows using Unstructured Meshes. Lecture Notes in Computational Science and Engineering. 2010; 74 ():227-234.

Chicago/Turabian Style

Ricard Borrell; Oriol Lehmkuhl; F. Xavier Trias; Manuel Soria; Assensi Oliva. 2010. "Parallel direct Poisson solver for DNS of complex turbulent flows using Unstructured Meshes." Lecture Notes in Computational Science and Engineering 74, no. : 227-234.

Journal article
Published: 01 March 2010 in Computers & Fluids
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ACS Style

Andrey Gorobets; F. Xavier Trias; Manuel Soria; Assensi Oliva. A scalable parallel Poisson solver for three-dimensional problems with one periodic direction. Computers & Fluids 2010, 39, 525 -538.

AMA Style

Andrey Gorobets, F. Xavier Trias, Manuel Soria, Assensi Oliva. A scalable parallel Poisson solver for three-dimensional problems with one periodic direction. Computers & Fluids. 2010; 39 (3):525-538.

Chicago/Turabian Style

Andrey Gorobets; F. Xavier Trias; Manuel Soria; Assensi Oliva. 2010. "A scalable parallel Poisson solver for three-dimensional problems with one periodic direction." Computers & Fluids 39, no. 3: 525-538.

Journal article
Published: 31 January 2010 in International Journal of Heat and Mass Transfer
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A set of direct numerical simulations of a differentially heated cavity of aspect ratio 4 with adiabatic horizontal walls is presented. The five configurations selected here (Rayleigh numbers based on the cavity height Ra=6.4×108,2×109,1010,3×1010 and 1011,Pr=0.71) cover a relatively wide range of Ra from weak to fully developed turbulence. A short overview of the numerical methods and the methodology used to verify the code and the simulations is presented. The time-averaged flow results are presented and discussed in this first part. Significant changes are observed for the two highest Ra for which the transition point at the boundary layers clearly moves upstream. Such displacement increases the top and bottom regions of disorganisation shrinking the area in the cavity core where the flow is stratified. Consequently, thermal stratification values are significantly greater than unity (1.25 and 1.41, respectively).

ACS Style

F.X. Trias; A. Gorobets; M. Soria; A. Oliva. Direct numerical simulation of a differentially heated cavity of aspect ratio 4 with Rayleigh numbers up to 1011 – Part I: Numerical methods and time-averaged flow. International Journal of Heat and Mass Transfer 2010, 53, 665 -673.

AMA Style

F.X. Trias, A. Gorobets, M. Soria, A. Oliva. Direct numerical simulation of a differentially heated cavity of aspect ratio 4 with Rayleigh numbers up to 1011 – Part I: Numerical methods and time-averaged flow. International Journal of Heat and Mass Transfer. 2010; 53 (4):665-673.

Chicago/Turabian Style

F.X. Trias; A. Gorobets; M. Soria; A. Oliva. 2010. "Direct numerical simulation of a differentially heated cavity of aspect ratio 4 with Rayleigh numbers up to 1011 – Part I: Numerical methods and time-averaged flow." International Journal of Heat and Mass Transfer 53, no. 4: 665-673.

Journal article
Published: 31 January 2010 in International Journal of Heat and Mass Transfer
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This is the second of a two-part paper on five direct numerical simulations of a differentially heated cavity of aspect ratio 4 with adiabatic horizontal walls (Rayleigh numbers based on the cavity height Ra=6.4×108,2×109,1010,3×1010 and 1011,Pr=0.71). The numerical methods and the time-averaged flow results were presented in the Part I. The heat transfer and the flow dynamics, including the turbulent statistics, the global kinetic energy balances and the internal waves motion phenomenon, are herewith described and discussed. The power-law scalings of the total kinetic dissipation rate and the Nusselt number suggest that a state of transition to a new scaling regime has been reached for the highest Ra.

ACS Style

F.X. Trias; A. Gorobets; M. Soria; A. Oliva. Direct numerical simulation of a differentially heated cavity of aspect ratio 4 with Rayleigh numbers up to 1011 – Part II: Heat transfer and flow dynamics. International Journal of Heat and Mass Transfer 2010, 53, 674 -683.

AMA Style

F.X. Trias, A. Gorobets, M. Soria, A. Oliva. Direct numerical simulation of a differentially heated cavity of aspect ratio 4 with Rayleigh numbers up to 1011 – Part II: Heat transfer and flow dynamics. International Journal of Heat and Mass Transfer. 2010; 53 (4):674-683.

Chicago/Turabian Style

F.X. Trias; A. Gorobets; M. Soria; A. Oliva. 2010. "Direct numerical simulation of a differentially heated cavity of aspect ratio 4 with Rayleigh numbers up to 1011 – Part II: Heat transfer and flow dynamics." International Journal of Heat and Mass Transfer 53, no. 4: 674-683.

Conference paper
Published: 01 January 2010 in Notes on Numerical Fluid Mechanics and Multidisciplinary Design
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Since direct numerical simulations of natural convection flows cannot be performed at high Ra-numbers, a dynamically less complex mathematical formulation is sought. In the quest for such a formulation, we consider regularizations (smooth approximations) of the nonlinearity. The regularization method basically alters the convective terms to reduce the production of small scales of motion by means of vortex stretching. In doing so, we propose to preserve the symmetry and conservation properties of the convective terms exactly. This requirement yields a novel class of regularizations that restrain the convective production of smaller and smaller scales of motion by means of vortex stretching in an unconditional stable manner, meaning that the velocity cannot blow up in the energy-norm (in 2D also: enstrophy-norm). The numerical algorithm used to solve the governing equations preserves the symmetry and conservation properties too. The regularization model is successfully tested for a 3D natural convection flow in air-filled (Pr = 0.71) differentially heated cavity of height aspect ratio 4 at Ra = 1010 and 1011. Moreover, a method to dynamically determine the regularization parameter (local filter length) is also proposed and tested.

ACS Style

F. Xavier Trias; R. W. C. P. Verstappen; Manuel Soria; Assensi Oliva. Parameter-Free Symmetry-Preserving Regularization Modelling of Turbulent Natural Convection Flows. Notes on Numerical Fluid Mechanics and Multidisciplinary Design 2010, 369 -375.

AMA Style

F. Xavier Trias, R. W. C. P. Verstappen, Manuel Soria, Assensi Oliva. Parameter-Free Symmetry-Preserving Regularization Modelling of Turbulent Natural Convection Flows. Notes on Numerical Fluid Mechanics and Multidisciplinary Design. 2010; ():369-375.

Chicago/Turabian Style

F. Xavier Trias; R. W. C. P. Verstappen; Manuel Soria; Assensi Oliva. 2010. "Parameter-Free Symmetry-Preserving Regularization Modelling of Turbulent Natural Convection Flows." Notes on Numerical Fluid Mechanics and Multidisciplinary Design , no. : 369-375.

Book chapter
Published: 04 February 2008 in Lecture Notes in Computational Science and Engineering
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A code for the direct numerical simulation (DNS) of incompressible turbulent flows that provides a fairly good scalability for a wide range of computer architectures has been developed. The spatial discretization of the incompressible Navier-Stokes equations is carried out using a fourth-order symmetry-preserving discretization. Since the code is fully explicit, from a parallel point of view, the main bottleneck is the Poisson equation. In the previous version of the code, that was conceived for low cost PC clusters with poor network performance, a Direct Schur-Fourier Decomposition (DSFD) algorithm was used to solve the Poisson equation. Such method, that was very efficient for PC clusters, can not be efficiently used with an arbitrarily large number of processors, mainly due to the RAM requirements [5] (that grows with the number of processors). To do so, a new version of the solver, named Krylov-Schur-Fourier Decomposition (KSFD), is presented here. Basically, it is based on the Direct Schur Decomposition (DSD) algorithm [7] that is used as a preconditioner for a Krylov method (CG) after Fourier decomposition. Benchmark results illustrating the robustness and scalability of the method on the MareNostrum supercomputer are presented and discussed. Finally, illustrative DNS simulations of wall-bounded turbulent flows are also presented.

ACS Style

F. Xavier Trias; Andrey Gorobets; Manuel Soria; A. Oliva. DNS of Turbulent Natural Convection Flows on the MareNostrum supercomputer. Lecture Notes in Computational Science and Engineering 2008, 267 -274.

AMA Style

F. Xavier Trias, Andrey Gorobets, Manuel Soria, A. Oliva. DNS of Turbulent Natural Convection Flows on the MareNostrum supercomputer. Lecture Notes in Computational Science and Engineering. 2008; ():267-274.

Chicago/Turabian Style

F. Xavier Trias; Andrey Gorobets; Manuel Soria; A. Oliva. 2008. "DNS of Turbulent Natural Convection Flows on the MareNostrum supercomputer." Lecture Notes in Computational Science and Engineering , no. : 267-274.

Book chapter
Published: 04 February 2008 in Lecture Notes in Computational Science and Engineering
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Some variants of the Schur Decomposition algorithm [1] to solve the Poisson equation on complex geometries with unstructured meshes are presented. This algorithms have been designed to be applied to Large Eddy Simulations with low cost parallel computers, in the context of the new CFD code TermoFluids [2]. Numerical experiments carried out in order to test the robustness and efficiency of the algorithms are presented. Preliminary tests show that in general Schur Complement techniques accelerate the convergence and are significantly faster than others approaches such as Krylov methods with sparse approximate inverse preconditioners [7].

ACS Style

Ricard Borrell; Oriol Lehmkuhl; Manuel Soria; Assensi Oliva. Schur Complement Methods for the solution of Poisson equation with unstructured meshes. Lecture Notes in Computational Science and Engineering 2008, 283 -290.

AMA Style

Ricard Borrell, Oriol Lehmkuhl, Manuel Soria, Assensi Oliva. Schur Complement Methods for the solution of Poisson equation with unstructured meshes. Lecture Notes in Computational Science and Engineering. 2008; ():283-290.

Chicago/Turabian Style

Ricard Borrell; Oriol Lehmkuhl; Manuel Soria; Assensi Oliva. 2008. "Schur Complement Methods for the solution of Poisson equation with unstructured meshes." Lecture Notes in Computational Science and Engineering , no. : 283-290.

Book chapter
Published: 04 February 2008 in Lecture Notes in Computational Science and Engineering
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The main features of TermoFluids are presented. It is a new unstructured and parallel objectoriented CFD code for accurate and reliable solving of industrial flows. The more relevant aspects from a parallel computing point of view, such as communication between CPUs and parallel direct and iterative algebraic solvers that allow TermoFluids to run efficiently on looselycoupled parallel computers are presented. Also, the different approaches for turbulence modelling implemented in TermoFluids (RANS, LES and hybrid LES/RANS models) are pointed out. Illustrative results of numerical simulation of industrial problems, as the thermal optimisation of the nacelle of a wind turbine, are also presented.

ACS Style

O. Lehmkuhl; Carlos-David Perez-Segarra; Ricard Borrell; Manuel Soria; A. Oliva. TermoFluids: A new Parallel unstructured CFD code for the simulation of turbulent industrial problems on low cost PC Cluster. Lecture Notes in Computational Science and Engineering 2008, 275 -282.

AMA Style

O. Lehmkuhl, Carlos-David Perez-Segarra, Ricard Borrell, Manuel Soria, A. Oliva. TermoFluids: A new Parallel unstructured CFD code for the simulation of turbulent industrial problems on low cost PC Cluster. Lecture Notes in Computational Science and Engineering. 2008; ():275-282.

Chicago/Turabian Style

O. Lehmkuhl; Carlos-David Perez-Segarra; Ricard Borrell; Manuel Soria; A. Oliva. 2008. "TermoFluids: A new Parallel unstructured CFD code for the simulation of turbulent industrial problems on low cost PC Cluster." Lecture Notes in Computational Science and Engineering , no. : 275-282.