Abstract：A meshless approach based on the LBM (Lattice?Boltzmann Method) was employed for simulating a cross-flow heat exchanger. The calculated hydrodynamics was compared with the CFD for discussion. The results showed that the LBM combined with LES predicted the turbulent hydrodynamics of the heat exchanger reasonably. The simulated fluid velocity distributions agreed with the referenced experimental data. The calculation deviations on key physical quantities were also acceptable for engineering purpose. The subsequent comparison indicated that the LBM and CFD had almost the same calculation results and cost. There was no apparent difference in the computational efficiency between the two models. Nevertheless, the CFD simulation required more effort in the pre-process for mesh generation. This problem was especially serious for simulating the heat exchangers with complex internals. In contrast, the LBM was a particle based method. It predicted the hydrodynamics by tracking the probability distribution function to an equilibrium state. The concept of discrete grids was replaced by the lattice. It only needed to specify the lattice size regardless of the geometrical adaption. Hence, the LBM modeling was considered to be more efficient and it was suggested highly for the simulation design of complex geometrical structures.
袁梦霞 乔秀臣. LBM和CFD数值模拟错流列管流体力学的效率比较[J]. 过程工程学报, 2018, 18(1): 35-40.
Mengxia YUAN Xiuchen QIAO. Comparison of LBM and CFD for Hydrodynamic Simulation of Cross-flow Tube Bundle. Chin. J. Process Eng., 2018, 18(1): 35-40.
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2018, Vol. 18 
