Prof. Bruno Souza Carmo
Universidade de São Paulo, São Paulo, Brazil
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Academic Career Length
23Years (2004-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications8 February 2013 in Journal of Fluid Mechanics
Journal Article
GAG. R. S. Assi
G. R. S. AssiPBP. W. Bearman
P. W. Bearman
Bruno Souza CarmoJMJ. R. Meneghini
J. R. MeneghiniSSSpencer Sherwin
Spencer SherwinRWR. H. J. Willden
R. H. J. Willden
When a pair of tandem cylinders is immersed in a flow the downstream cylinder can be excited into wake-induced vibrations (WIV) due to the interaction with vortices coming from the upstream cylinder. Assi, Bearman & Meneghini (J. Fluid Mech., vol. 661, 2010, pp. 365–401) concluded that the WIV excitation mechanism has its origin in the unsteady vortex–structure interaction encountered by the cylinder as it oscillates across the wake. In the present paper we investigate how the cylinder responds to that excitation, characterising the amplitude and frequency of response and its dependency on other parameters of the system. We introduce the concept ofwake stiffness, a fluid dynamic effect that can be associated, to a first approximation, with a linear spring with stiffness proportional to $\mathit{Re}$ and to the steady lift force occurring for staggered cylinders. By a series of experiments with a cylinder mounted on a base without springs we verify that such wake stiffness is not only strong enough to sustain oscillatory motion, but can also dominate over the structural stiffness of the system. We conclude that while unsteady vortex–structure interactions provide the energy input to sustain the vibrations, it is the wake stiffness phenomenon that defines the character of the WIV response.
1 May 2011 in Journal of Fluids and Structures
Journal Article
Bruno Souza CarmoSSSpencer Sherwin
Spencer SherwinPBP.W. Bearman
P.W. Bearman
RWR.H.J. Willden
R.H.J. Willden
1 August 2006 in Journal of Fluids and Structures
Journal Article
Bruno Souza CarmoJMJ.R. Meneghini
J.R. Meneghini10 February 2010 in Journal of Fluid Mechanics
Journal Article
Bruno Souza CarmoJMJulio R. Meneghini
Julio R. MeneghiniSSSpencer Sherwin
Spencer SherwinDirect stability analysis and numerical simulations have been employed to identify and characterize secondary instabilities in the wake of the flow around two identical circular cylinders in tandem arrangements. The centre-to-centre separation was varied from 1.2 to 10 cylinder diameters. Four distinct regimes were identified and salient cases chosen to represent the different scenarios observed, and for each configuration detailed results are presented and compared to those obtained for a flow around an isolated cylinder. It was observed that the early stages of the wake transition changes significantly if the separation is smaller than the drag inversion spacing. The onset of the three-dimensional instabilities were calculated and the unstable modes are fully described. In addition, we assessed the nonlinear character of the bifurcations and physical mechanisms are proposed to explain the instabilities. The dependence of the critical Reynolds number on the centre-to-centre separation is also discussed.
1 May 2010 in Physics of Fluids
Journal Article
The possible states in the flow around two identical circular cylinders in tandem arrangements are investigated for configurations in the vicinity of the drag inversion separation. By means of numerical simulations, the hysteresis in the transition between the shedding regimes is studied and the relationship between (three-dimensional) secondary instabilities and shedding regime determination is addressed. The differences observed in the behavior of two- and three-dimensional flows are analyzed, and the regions of bistable flow are delimited. Very good agreement is found between the proposed scenario and results available in the literature.
1 February 2008 in Journal of Fluid Mechanics
Journal Article
Bruno Souza CarmoSSSpencer Sherwin
Spencer SherwinPBPeter W. Bearman
Peter W. Bearman
RWRichard H. J. Willden
Richard H. J. Willden
The wake transition of the flow around two circular cylinders placed in staggered arrangements with fixed streamwise separation of 5Dand cross-stream separation varying from 0 to 3Dhas been studied. The wake transition is compared to that of a single isolated cylinder. Linear stability analysis utilizing Floquet theory and direct numerical simulations using a spectral/hp element spatial discretization were carried out. The unstable modes that first appear in the wake transition of the flow around a single cylinder, which are the long-spanwise-wavelength mode A and the short-spanwise-wavelength mode B, are also found in the flow around the staggered arrangements. However, a third mode, referred to as mode C, is also present in the wake transition of the flow around staggered arrangements, depending on the relative positioning of the cylinders. This mode has an intermediate spanwise wavelength and period-doubling character. The structure and onset characteristics of mode C are analysed and the nonlinear character of the bifurcation for this mode is investigated.
About Me
Dr Bruno Souza Carmo obtained a degree in Mechatronics from the University of São Paulo (2002), completed an MSc in Mechanical Engineering at the University of São Paulo (2005), did his PhD in Aeronautics at Imperial College London (2009) and got the habilitation degree in Mechanical Engineering, specialization in Fluid Mechanics, from the Department of Mechanical Engineering of Escola Politécnica, University of São Paulo (2020). He joined the Department of Mechanical Engineering at the University of São Paulo, São Paulo campus, in July 2010 and has been carrying out research as a member of the Centre For Dynamic and Fluids (NDF) since then. He has also been part of the Research Centre for Greenhouse Gas Innovation (RCGI) since its origination, working as deputy scientific director and coordinating two projects in the Engineering programme, one project in the CO2 abatement programme and one project in the Geophysics programme. He was promoted to Associate Professor in March 2021. His areas of expertise are fluid mechanics and energy, and he is currently working on projects and supervising students in the following research lines: hydrodynamic stability, fluid-structure interaction, CFD-based optimization, high-order finite element methods, renewable energy (wind, tidal and biomass), biological flows, hybrid power systems, fuel cells, gas purification and computational geophysics.