Smooth Particle Hydrodynamics (SPH) and Lattice Boltzmann Method (LBM) can accurately capture the violent deformation of free surface as novel numerical simulation methods. SPH and LBM methods are applied to simulate the 2-D dam-break flow, the 3-D dam-break flow striking fixed and transportable obstacles. Compared with previous flume data, SPH method can get smoother and clearer free surface, but some particles adhere to the boundary wall and the predicted pressure values fluctuate at times. The viscous term of momentum equation and boundary conditions need to be improved further. Coupled with the discrete element method (DEM), SPH method can resolve solid-fluid interactions. The free surface obtained by LBM method is splashing and broken at large deformation, and the prediction of water depth and pressure is more precise, but the simulation of rigid body motion needs to be strengthened. In addition, the computational efficiency of the two methods is also compared. Under the same CPU scenario, the computational efficiency of LBM is higher than that of SPH method. GPU parallelism can greatly reduce computing time.
Key words
dam-break flow /
SPH method /
LBM method /
free surface /
numerical simulation
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Funding
The National Natural Science Foundation of China
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