【摘要】 应用格子Boltzmann方法和D2Q9格子模型,结合剪切速率的局部计算方法以及非平衡外推边界处理格式,数值模拟了幂律流体在3:1扩展流道(2D)中的流动行为.获得了不同雷诺数Re和幂律指数n下扩展流动的流线分布,计算出了漩涡的涡心位置和大小,分析了Re和n对扩展流动特点的影响.模拟结果表明本模型和处理方法具有良好的精度和稳定性.更多还原

【Abstract】 Based on the lattice Boltzmann method and the D2Q9 lattice model,the plane 1:3 sudden expansion flow of power-law fluid was studied numerically with the local calculation method for the shear rate and the non-equilibrium extrapolation method for the conditions.The streamline patterns for sudden expansion flow of the power-law with different Reynolds numbers R_e and power-law indices n were obtained,and the positions of the vortex center and length of the vortex were also listed.The influences of/?,and n on sudden expansion flow of power-law fluid were discussed.The results also confirmed that this method present a fine accuracy and stability.更多还原