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A GPU-accelerated two-phase flow model for fluid-solid interaction using the sharp interface immersed boundary method

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A GPU-accelerated two-phase flow model for fluid-solid interaction using the sharp interface immersed boundary method
A two-phase flow model accelerated by graphical processing unit(GPU)is developed to solve fluid-solid interaction(FSI)using the sharp interface immersed boundary method(IBM).This model solves the incompressible Navier-Stokes equations using the projection-based fractional step method in a fixed staggered Cartesian grid system.A volume of fluid(VOF)method with second-order accuracy is employed to trace the free surface.To represent the intricate surface geometry,the structure is discretized using the unstructured triangle mesh.Additionally,a ray tracing method is employed to classify fluid and solid points.A high-order stable scheme has been introduced to reconstruct the local velocity at interface points.Three FSI problems,including wave evolution around a breakwater,interaction between a periodic wave train and a moving float,and a 3-D moving object interacting with the free surface,were investigated to validate the accuracy and stability of the proposed model.The numerical results are in good agreement with the experimental data.Additionally,we evaluated the computational performance of the proposed GPU-based model.The GPU-based model achieved a 42.29 times speedup compared with the single-core CPU-based model in the three-dimensional test.Additionally,the results regarding the time cost of each code section indicate that achieving more significant acceleration is associated with solving the turbulence,advection,and diffusion terms,while solving the pressure Poisson equation(PPE)saves the most time.Furthermore,the impact of grid number on computational efficiency indicates that as the number of grids increases,the GPU-based model outperforms the multi-core CPU-based model.

Fluid-solid interaction(FSI)immersed boundary method(IBM)graphical processing unit(GPU)two-phase flowmoving rigid body

Li-ping Ma、Ji-jian Lian、Dong-ming Liu

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State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation,Tianjin University,Tianjin 300072,China

School of Civil Engineering,Tianjin University,Tianjin 300072,China

State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610065,China

Fluid-solid interaction(FSI) immersed boundary method(IBM) graphical processing unit(GPU) two-phase flow moving rigid body

2024

10.1007/s42241-024-0065-z

水动力学研究与进展B辑
中国船舶科学研究中心

水动力学研究与进展B辑

CSTPCDEI
影响因子：0.596
ISSN：1001-6058
年,卷(期)：2024.36(5)