基于改进的浸没边界-格子Boltzmann方法的圆柱绕流仿真计算

Simulation of Flow past a Cylinder Based on an Improved Immersed Boundary-Lattice Boltzmann Method

基于Suzuki等人提出的浸没边界-格子Boltzmann方法,采用作用力格子Boltzmann模型,提出了一种改进的浸没格子Boltzmann算法。对比相同计算循环次数的圆柱绕流仿真结果发现,改进算法通过提高流场速度分布函数的计算精度来简化流固边界表面作用力计算方法,避免了使用迭代计算,简化了计算流程,使得在低雷诺数定常流动圆柱绕流仿真时,圆柱绕流流线的对称性得到了保证,计算更为稳定,且计算效率得到了显著提高。在定常流与非定常流的圆柱绕流仿真应用中,论文计算结果与其他文献中的结果吻合较好,表明了改进算法的有效性。

An improved immersed boundary-lattice Boltzmann method is introduced. The results are compared with the original approach with the same numbers of iteration. With the improved method the accuracy of velocity distribution of the fluid field is enhanced, which can simplify forces acting on the fluid-solid boundary. Calculation progress is stable and calculation efficiency is improved for the flow past a cylinder at low Reynolds, and the results are close to analytical solutions.