| Summary: | 碩士 === 國立清華大學 === 動力機械工程學系 === 106 === In this work, turbulent channel flows over 3D periodic hills were simulated using the D3Q19 multiple-relaxation-time lattice Boltzmann method (MRT-LBM) at Reynolds numbers Re = 700, 1400, 2800, 5600, 10595. The BFL bounce-back rule for curved boundaries was implemented on hill surfaces, and Guo et al.’s body force model was added to drive the flow. Several observations and investigations were made that showed good agreement with Breuer et al.’s findings of with different Re numbers and streamwise locations. In brief, the LBM scheme for flows over periodic hills was well constructed. Additionally, the simulations were conducted on a multi-GPU cluster with both CUDA and MPI implemented, and some optimizations were applied for higher efficiency.
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