Analysis of reflective and non-reflective boundary conditions in LBM simulations of flow past an obstacle in a channel

作者：Puig Aranega Albert; Burgos Javier; Cito Salvatore; Cuesta Ildefonso; Saluena Clara^*

来源：International Journal of Computational Fluid Dynamics, 2015, 29(9-10): 434-446.

DOI：10.1080/10618562.2015.1111341

• lattice Boltzmann method
• boundary conditions
• incidence angle
• low Reynolds
• characteristic boundary conditions
• vortex shedding
• square obstacle

This paper analyses the effects of considering non-reflective (characteristic boundary conditions) versus reflective boundary conditions (BCs) on the flow past a square object. We observe a clear dependence of the force exerted over the obstacle on the choice of BCs. Recirculation lengths, lift and drag coefficients, phase diagrams and streamlines for several angles of incidence are compared for a range of low Reynolds numbers (50-150) and two different values of the ratio of the object cross section to the channel width, 1/8 and 1/16. We remark distinct effects depending on the combination of BCs used at the inlet and at the outlet.

• 出版日期2015-10-21