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谐波平衡法是一种有效的周期性非定常流的计算方法.采用基于可压缩流的谐波平衡方程在计算低速不可压流动时,会由于对流通量计算格式中的数值粘性污染,降低解的精度和收敛性.采用预处理技术,使得基于可压缩流的谐波平衡方程可以直接用于低速周期性非定常流的计算中.选取典型的不可压方腔驱动流和低雷诺数圆柱绕流为例进行了时间推进法和谐波平衡法的计算对比.计算结果表明预处理后的谐波平衡方程适合于低速流的计算,在谐波平衡法中采用较少阶数的谐波计算就可以还原出几乎准确的非定常流场.
Harmonic balance method is an effective periodic unsteady flow calculation method.Using the harmonic balance equation based on compressible flow in the calculation of low-speed incompressible flow, due to the numerical value of the flow flux calculation format sticky pollution, reduce The accuracy and convergence of the solution.Using preprocessing technology, the harmonic balance equation based on compressible flow can be directly used in the calculation of low-speed periodic unsteady flow.Selecting typical incompressible square cavity driving flow and low Reynolds number cylinder Taking the flow as an example, the time advance method and the harmonic balance method are compared and calculated.The results show that the pre-processed harmonic balance equation is suitable for the low-speed flow calculation, and the harmonics balance method uses less order harmonics Calculations can restore almost accurate unsteady flow fields.