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Chao Wang
College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China

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Preprint content
Published: 16 July 2021
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ACS Style

Yuan Zhang; Longbin Tao; Chao Wang; Chunyu Guo. Peridynamic Analysis of Fragmentation of Ice Plate Under Explosive Loading With Thermal Effects. 2021, 1 .

AMA Style

Yuan Zhang, Longbin Tao, Chao Wang, Chunyu Guo. Peridynamic Analysis of Fragmentation of Ice Plate Under Explosive Loading With Thermal Effects. . 2021; ():1.

Chicago/Turabian Style

Yuan Zhang; Longbin Tao; Chao Wang; Chunyu Guo. 2021. "Peridynamic Analysis of Fragmentation of Ice Plate Under Explosive Loading With Thermal Effects." , no. : 1.

Journal article
Published: 09 July 2021 in Applied Ocean Research
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The bow shape is the most critical factor to determine the icebreaking performance of an icebreaker. Mechanism study on the icebreaking process for different bow types is necessary for the initial design of the icebreaker hull form. This paper proposed an ice-ship interaction model based on the meshfree method, Peridynamics, in which the geometric mathematics concept is embedded to detect the contact between material points and ship hull. Furthermore, a fast contact detection algorithm based on Massage Passing Interface (MPI) solver is built to improve the computational efficiency of the developed numerical method. Two typical icebreaker bows, the conventional bow and the unconventional bow, breaking the level ice with constant speed is numerically studied by the above model. The results of the conventional icebreaker bow are compared with the experimental results, which verifies the simulation accuracy of the model developed in the present work. Afterwards, the icebreaking modes and icebreaking loads of two different shapes of icebreaker bows are compared and analysed. The results show that the developed ice-ship interaction model effectively predicts differences of icebreaking processes between different icebreakers, such as ice damage pattern, ice loads, and channel, despite their common point in domain bending failure mode. Moreover, this research significantly improves computational efficiency and provides theoretical guidance for designing the icebreaker bow.

ACS Style

Yuan Zhang; Longbin Tao; Chao Wang; Liyu Ye; Shuai Sun. Numerical study of icebreaking process with two different bow shapes based on developed particle method in parallel scheme. Applied Ocean Research 2021, 114, 102777 .

AMA Style

Yuan Zhang, Longbin Tao, Chao Wang, Liyu Ye, Shuai Sun. Numerical study of icebreaking process with two different bow shapes based on developed particle method in parallel scheme. Applied Ocean Research. 2021; 114 ():102777.

Chicago/Turabian Style

Yuan Zhang; Longbin Tao; Chao Wang; Liyu Ye; Shuai Sun. 2021. "Numerical study of icebreaking process with two different bow shapes based on developed particle method in parallel scheme." Applied Ocean Research 114, no. : 102777.

Journal article
Published: 26 June 2021 in Ocean Engineering
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Ice-class propellers often bear substantial loads during their life cycle, and their strength must therefore be analysed and evaluated during the design phase. In this study, a blade strength evaluation method was established and the influences of various propeller parameters on the strength were analysed considering the Unified Polar Class Rules (URI3) specifications. Further, a primary optimisation method was proposed based on the strength assessment approximation model. Both the hydrodynamic load and ice load were considered in the strength assessment process, and in-house code was developed based on the panel and finite element methods (FEM) to combine the fluid and structural calculation models. The entire analysis process was performed for an R-class propeller and, considering the strength assessment and analysis results, the reverse-rotating scenario (denoted as case 5) was deemed the most dangerous working condition for the R-class propeller. It was found that the thickness, rotation speed, chord, and mutual interactions significantly impact the blade strength.

ACS Style

Chunyu Guo; Kang Han; Chao Wang; Liyu Ye; Chunhui Wang. Evaluation and analysis of the static strength of ice-class propellers. Ocean Engineering 2021, 235, 109336 .

AMA Style

Chunyu Guo, Kang Han, Chao Wang, Liyu Ye, Chunhui Wang. Evaluation and analysis of the static strength of ice-class propellers. Ocean Engineering. 2021; 235 ():109336.

Chicago/Turabian Style

Chunyu Guo; Kang Han; Chao Wang; Liyu Ye; Chunhui Wang. 2021. "Evaluation and analysis of the static strength of ice-class propellers." Ocean Engineering 235, no. : 109336.

Journal article
Published: 28 May 2021 in Ocean Engineering
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The existence of ice and its interaction with structure greatly threaten the navigation of the icebreaker. Due to the damage characteristics of ice, the traditional numerical ways based on mesh method are challenging to solve ice-structure interaction. The nonlocal particle methods have increasingly gained popularity as an essential tool for calculating large deformation problems. In the present work, a meshfree particle-based computational model is developed to investigate the icebreaking process and dynamic icebreaking resistance. The model employs ordinary state-based Peridynamics theory to establish the constitutive relation for ice which is modelled as an isotropic homogeneous elastic material. Furthermore, a continuous contact detection algorithm is proposed, which can be applied to detect the contact process between irregular structures and particles, to study the process of ice-ship interaction. Two dimensional (2D) three-points bending of ice beam and 3D ice sphere impact are studied numerically to validate the method specifically in modelling ice failure. Then, the investigation on the continuous-mode icebreaking process is carried out. The comparison of the present numerical results with existing experimental data demonstrated the validity and accuracy of the present numerical model for analysing the icebreaking process and predicting the icebreaking resistance.

ACS Style

Zhang Yuan; Tao Longbin; Wang Chao; Ye Liyu; Guo Chunyu. Numerical study on dynamic icebreaking process of an icebreaker by ordinary state-based peridynamics and continuous contact detection algorithm. Ocean Engineering 2021, 233, 109148 .

AMA Style

Zhang Yuan, Tao Longbin, Wang Chao, Ye Liyu, Guo Chunyu. Numerical study on dynamic icebreaking process of an icebreaker by ordinary state-based peridynamics and continuous contact detection algorithm. Ocean Engineering. 2021; 233 ():109148.

Chicago/Turabian Style

Zhang Yuan; Tao Longbin; Wang Chao; Ye Liyu; Guo Chunyu. 2021. "Numerical study on dynamic icebreaking process of an icebreaker by ordinary state-based peridynamics and continuous contact detection algorithm." Ocean Engineering 233, no. : 109148.

Journal article
Published: 28 May 2021 in Ocean Engineering
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There is a strong gap flow exists between the pump rotor tip and the inside of the duct of the pump jet propulsor. To predict the hydrodynamic performance of a pump jet propulsor more accurately, considering the influence of fluid viscosity in the gap area, a gap flow model suitable for a pump jet propulsor is proposed. Through an analysis of the hydrodynamic performance of the pump jet propulsor, it is determined that it is optimal for the gap height to be 0.98–1.0 times of the complete gap height, Additionally, it is verified that the flux coefficient (CQ) range of 0.8–0.84, which can accurately simulate the energy loss of the fluid at the gap flow, is reasonable. Moreover, through a comparative analysis of the hydrodynamic performance, pressure, and circulation distribution of the pump jet propulsor, it is found that, when the influence of the gap flow model is considered, the wall pressure and circulation distribution of the rotor blade and duct are more consistent with the calculation results of viscous flow. In addition, the introduction of the gap flow model only improves the prediction accuracy of the hydrodynamic performance of the pump jet propulsor.

ACS Style

Hu Jian; Weng Kaiqiang; Wang Chao; Gu Lang; Guo Chunyu. Prediction of hydrodynamic performance of pump jet propulsor considering the effect of gap flow model. Ocean Engineering 2021, 233, 109162 .

AMA Style

Hu Jian, Weng Kaiqiang, Wang Chao, Gu Lang, Guo Chunyu. Prediction of hydrodynamic performance of pump jet propulsor considering the effect of gap flow model. Ocean Engineering. 2021; 233 ():109162.

Chicago/Turabian Style

Hu Jian; Weng Kaiqiang; Wang Chao; Gu Lang; Guo Chunyu. 2021. "Prediction of hydrodynamic performance of pump jet propulsor considering the effect of gap flow model." Ocean Engineering 233, no. : 109162.

Journal article
Published: 18 April 2021 in Ocean Engineering
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In case of a four-screw ship, the propellers show different hydrodynamics performance due to the asymmetric distribution of the wake. And the particularity of the scale effect on wake field for this type of ship would make a more complicated characteristics on propeller bearing force. In this paper, a numerical simulation study of scale effect on propeller unsteady bearing force of a four-screw ship was performed by employing RANS method. The load variation of the single-blade is analyzed to understand the fluid mechanism of the interaction between the propeller blade and wake flow. The larger wake field difference between inside and outside propeller disk aggravates the unbalanced load distribution for the full-scale ship. The results of propeller bearing force highlight that the fluctuation values of full-scale ship are smaller than those of model one. Moreover, the scale effect of outside propeller is strong with respect to the inside one. The above findings can provide theoretical guidance for load balancing and vibration reduction of the four-screw ships.

ACS Style

Shuai Sun; Zhiqiang Hu; Chao Wang; Zeqing Guo; Xiang Li. Numerical prediction of scale effect on propeller bearing force of a four-screw ship. Ocean Engineering 2021, 229, 108974 .

AMA Style

Shuai Sun, Zhiqiang Hu, Chao Wang, Zeqing Guo, Xiang Li. Numerical prediction of scale effect on propeller bearing force of a four-screw ship. Ocean Engineering. 2021; 229 ():108974.

Chicago/Turabian Style

Shuai Sun; Zhiqiang Hu; Chao Wang; Zeqing Guo; Xiang Li. 2021. "Numerical prediction of scale effect on propeller bearing force of a four-screw ship." Ocean Engineering 229, no. : 108974.

Journal article
Published: 01 December 2020 in Journal of Marine Science and Engineering
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The interactions between the main hull and demi-hull of trimarans have been arousing increasing attention, and detailed circumferential flow fields greatly influence trimaran research. In this research, the unsteady wake flow field of a trimaran was obtained by Reynolds-Averaged Navier-Stokes (RANS) equations on the basis of the viscous flow principles with consideration of the heaving and pitching of the trimaran. Then, we designed an experimental method based on particle-image velocimetry (PIV) and obtained a detailed flow field between the main hull and demi-hull of the trimaran. A trimaran model with one demi-hull made of polycarbonate material with 90% light transmission rate and a refractive index 1.58 (close to that of water 1.33) was manufactured as the experiment sample. Using polycarbonate material, the laser-sheet light-source transmission and high-speed camera recording problems were effectively rectified. Moreover, a nonstandard calibration was added into the PIV flow field measurement system. Then, we established an inverse three-dimensional (3D) distortion coordinate system and obtained the corresponding coordinates by using optics calculations. Further, the PIV system spatial mapping was corrected, and the real flow field was obtained. The simulation results were highly consistent with the experimental data, which showed the methods established in this study provided a strong reference for obtaining the detailed flow field information between the main hull and demi-hull of trimarans.

ACS Style

Cong Sun; Chunyu Guo; Chao Wang; Lianzhou Wang; Jianfeng Lin. Numerical and Experimental Study of Flow Field between the Main Hull and Demi-Hull of a Trimaran. Journal of Marine Science and Engineering 2020, 8, 975 .

AMA Style

Cong Sun, Chunyu Guo, Chao Wang, Lianzhou Wang, Jianfeng Lin. Numerical and Experimental Study of Flow Field between the Main Hull and Demi-Hull of a Trimaran. Journal of Marine Science and Engineering. 2020; 8 (12):975.

Chicago/Turabian Style

Cong Sun; Chunyu Guo; Chao Wang; Lianzhou Wang; Jianfeng Lin. 2020. "Numerical and Experimental Study of Flow Field between the Main Hull and Demi-Hull of a Trimaran." Journal of Marine Science and Engineering 8, no. 12: 975.

Journal article
Published: 04 October 2020 in Journal of Marine Science and Engineering
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In marine environments, ships are bound to be disturbed by several external factors, which can cause stochastic fluctuations and strong nonlinearity in the ship motion. Predicting ship motion is pivotal to ensuring ship safety and providing early warning of risks. This report proposes a real-time ship vertical acceleration prediction algorithm based on the long short-term memory (LSTM) and gated recurrent units (GRU) models of a recurrent neural network. The vertical acceleration time history data at the bow, middle, and stern of a large-scale ship model were obtained by performing a self-propulsion test at sea, and the original data were pre-processed by resampling and normalisation via Python. The prediction results revealed that the proposed algorithm could accurately predict the acceleration time history data of the large-scale ship model, and the root mean square error between the predicted and real values was no greater than 0.1. The optimised multivariate time series prediction program could reduce the calculation time by approximately 55% compared to that of a univariate time series prediction program, and the run time of the GRU model was better than that of the LSTM model.

ACS Style

Yumin Su; Jianfeng Lin; Dagang Zhao; Chunyu Guo; Chao Wang; Hang Guo. Real-Time Prediction of Large-Scale Ship Model Vertical Acceleration Based on Recurrent Neural Network. Journal of Marine Science and Engineering 2020, 8, 777 .

AMA Style

Yumin Su, Jianfeng Lin, Dagang Zhao, Chunyu Guo, Chao Wang, Hang Guo. Real-Time Prediction of Large-Scale Ship Model Vertical Acceleration Based on Recurrent Neural Network. Journal of Marine Science and Engineering. 2020; 8 (10):777.

Chicago/Turabian Style

Yumin Su; Jianfeng Lin; Dagang Zhao; Chunyu Guo; Chao Wang; Hang Guo. 2020. "Real-Time Prediction of Large-Scale Ship Model Vertical Acceleration Based on Recurrent Neural Network." Journal of Marine Science and Engineering 8, no. 10: 777.

Reference work
Published: 02 March 2020 in Encyclopedia of Ocean Engineering
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V Velocity of ship n Propeller rotational speed D Propeller diameter r Radius of the section t Time ϕ r Pitch angle of the section F Force M Moment F x Force in the direction of x-axis F y Force in...

ACS Style

Chao Wang. Polar Propulsion. Encyclopedia of Ocean Engineering 2020, 1 -9.

AMA Style

Chao Wang. Polar Propulsion. Encyclopedia of Ocean Engineering. 2020; ():1-9.

Chicago/Turabian Style

Chao Wang. 2020. "Polar Propulsion." Encyclopedia of Ocean Engineering , no. : 1-9.

Articles
Published: 25 November 2019 in Ships and Offshore Structures
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A novel energy saving device, namely a rudder bulb-turbine device (RBTD), is proposed, which consists of turbine blades, a rudder bulb, a transmission shaft, a generator, and a variable-frequency drive. The propeller wake affects the turbine blade and causes it to rotate together with the head of the rudder bulb and to drive the generator inside the rudder to produce electricity, thereby recovering the rotational energy of the propeller wake. Computations are conducted in towing, propeller open-water, and self-propulsion conditions for a 9200TEU containership to explore the effect of the RBTD. The results show that the RBTD has a positive effect on the powering characteristics and the extractable power of the RBTD generator is approximately equal to that of a small generator installed in a large containership. It can also significantly suppress the tangential motion in the wake of the propeller and has favorable interference to the hull.

ACS Style

Chunhui Wang; Chunyu Guo; Chao Wang; Fenglei Han. A case study on the effect of an energy recovering rudder bulb-turbine device on ship powering characteristics. Ships and Offshore Structures 2019, 15, 878 -894.

AMA Style

Chunhui Wang, Chunyu Guo, Chao Wang, Fenglei Han. A case study on the effect of an energy recovering rudder bulb-turbine device on ship powering characteristics. Ships and Offshore Structures. 2019; 15 (8):878-894.

Chicago/Turabian Style

Chunhui Wang; Chunyu Guo; Chao Wang; Fenglei Han. 2019. "A case study on the effect of an energy recovering rudder bulb-turbine device on ship powering characteristics." Ships and Offshore Structures 15, no. 8: 878-894.

Journal article
Published: 23 September 2019 in Journal of Marine Science and Engineering
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The numerical calculation was performed for the KRISO Container Ship (KCS) hull-propeller-rudder system with different freedom hull motion by employing the Reynolds-Averaged Navier-Stokes (RANS) method and adopting the overset grid. Firstly, the numerical simulation of hydrodynamics for a bare hull with the heave and pitch motion is carried out. The results show that the space non-uniformity of a nominal wake in the disk plane with motion is comparable to the case without motion. However, the time non-uniformity increases sharply and it has a significant positive relationship with the motion amplitude. Then, the propeller exciting force is calculated in the case including single heave, single pitch and their couple motion. It was found that both the ship and propeller hydrodynamic performance deteriorated dramatically due to the hull motion. Furthermore, the spectrum peak at the motion frequency is dominant in all the peak values and the larger the amplitude is, the higher the motion frequency peak is expected to be. For the propeller bearing force, the effect of the different hull motions appears as linear superimposition. However, the superimposition of different hull motions enlarges the propeller-induced fluctuating pressure in a single motion.

ACS Style

Liang Li; Bin Zhou; Dengcheng Liu; Chao Wang; Li; Zhou; Liu; Wang. Numerical Analysis of Influence of the Hull Couple Motion on the Propeller Exciting Force Characteristics. Journal of Marine Science and Engineering 2019, 7, 330 .

AMA Style

Liang Li, Bin Zhou, Dengcheng Liu, Chao Wang, Li, Zhou, Liu, Wang. Numerical Analysis of Influence of the Hull Couple Motion on the Propeller Exciting Force Characteristics. Journal of Marine Science and Engineering. 2019; 7 (10):330.

Chicago/Turabian Style

Liang Li; Bin Zhou; Dengcheng Liu; Chao Wang; Li; Zhou; Liu; Wang. 2019. "Numerical Analysis of Influence of the Hull Couple Motion on the Propeller Exciting Force Characteristics." Journal of Marine Science and Engineering 7, no. 10: 330.

Journal article
Published: 20 November 2018 in Ocean Engineering
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There is a strong gap flow in the pump jet propulsor, in order to predict the hydrodynamic performance of the pump jet propulsor, the steady-state hydrodynamic disturbance model was established by the panel method. The pump jet propulsor was divided into two systems, rotor-hub and stator-duct, and inter-system interference was considered by induced velocity. Aiming at the geometric shape of stator, a method of leaf meshes based on circular cone was proposed. Based on the actual situation of the internal flow of the pump, a tip leakage vortex model suitable for the flat-topped blade was proposed. Comparing the results of pressure, circulation, and propulsion performance, it was found that when the influence of tip vortex is considered, the overall annular distribution of rotor blade and tip load are closer to the actual situation, and the performance curve is in good agreement with the viscous flow, which shows that this method can effectively predict the steady hydrodynamic performance of the pump jet propulsor.

ACS Style

Chao Wang; Kaiqiang Weng; Chunyu Guo; Lang Gu. Prediction of hydrodynamic performance of pump propeller considering the effect of tip vortex. Ocean Engineering 2018, 171, 259 -272.

AMA Style

Chao Wang, Kaiqiang Weng, Chunyu Guo, Lang Gu. Prediction of hydrodynamic performance of pump propeller considering the effect of tip vortex. Ocean Engineering. 2018; 171 ():259-272.

Chicago/Turabian Style

Chao Wang; Kaiqiang Weng; Chunyu Guo; Lang Gu. 2018. "Prediction of hydrodynamic performance of pump propeller considering the effect of tip vortex." Ocean Engineering 171, no. : 259-272.

Journal article
Published: 29 January 2013 in Journal of Marine Science and Application
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In order to study cavitation characteristics of a 2-D hydrofoil, the method that combines nonlinear cavitation model and mixed-iteration is used to predict and analyze the cavitation performance of hydrofoils. The cavitation elements are nonlinearly disposed based on the Green formula and perturbation potential panel method. At the same time, the method that combines cavity shape for fixed cavity length (CSCL) iteration and cavity shape for fixed cavitation number (CSCN) iteration is used to work out the thickness and length of hydrofoil cavitations. Through analysis of calculation results, it can be concluded that the jump of pressure and velocity potentially exist between cavitation end area and non-cavitations area on suction surface when cavitation occurs on hydrofoil. In certain angles of attack, the cavitation number has a negative impact on the length of cavitations. And under the same angle of attack and cavitation number, the bigger the thickness of the hydrofoil, the shorter the cavitations length.

ACS Style

Chao Wang; Chunyu Guo; Xin Chang; Sheng Huang; Pusun Cao. Analysis of cavitation performance of a 2-D hydrofoil based on mixed-iterative method. Journal of Marine Science and Application 2013, 12, 52 -57.

AMA Style

Chao Wang, Chunyu Guo, Xin Chang, Sheng Huang, Pusun Cao. Analysis of cavitation performance of a 2-D hydrofoil based on mixed-iterative method. Journal of Marine Science and Application. 2013; 12 (1):52-57.

Chicago/Turabian Style

Chao Wang; Chunyu Guo; Xin Chang; Sheng Huang; Pusun Cao. 2013. "Analysis of cavitation performance of a 2-D hydrofoil based on mixed-iterative method." Journal of Marine Science and Application 12, no. 1: 52-57.

Research papers
Published: 20 July 2010 in Journal of Marine Science and Application
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Mathematical models of propellers were created that investigate the influence of periodic boundary conditions on predictions of a propeller’s performance. Thrust and torque coefficients corresponding to different advance coefficients of DTMB 4119, 4382, and 4384 propellers were calculated. The pressure coefficient distribution of the DTMB 4119 propeller at different sections was also physically tested. Comparisons indicated good agreement between the results of experiments and the simulation. It showed that the periodic boundary condition can be used to rationally predict the open water performance of a propeller. By analyzing the three established modes for the computation, it was shown that using the spline curve method to divide the grids can meet the calculation’s demands for precision better than using the rake cutting method.

ACS Style

Chao Wang; Sheng Huang; Xin Chang; Miao He. Applying periodic boundary conditions to predict open water propeller performance. Journal of Marine Science and Application 2010, 9, 262 -267.

AMA Style

Chao Wang, Sheng Huang, Xin Chang, Miao He. Applying periodic boundary conditions to predict open water propeller performance. Journal of Marine Science and Application. 2010; 9 (3):262-267.

Chicago/Turabian Style

Chao Wang; Sheng Huang; Xin Chang; Miao He. 2010. "Applying periodic boundary conditions to predict open water propeller performance." Journal of Marine Science and Application 9, no. 3: 262-267.