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使用Roe格式计算低马赫数流动,需采用预处理技术.在预处理技术中,需要选择适合的预处理参数,但有时很难找到,因而得不到合理的计算结果.通过数值实验,发现使用预处理方法时,格式的数值粘性对低速流动的模拟有显著的影响.提出了在预处理Roe格式中加入可调参数,用以控制数值粘性对计算结果的影响.带有可调节数值粘性参数的预处理Roe格式的数值粘性更接近低速流动的真实耗散,反映了低速流动的真实物理现象.对方腔流动和圆柱绕流的低雷诺数定常流动所做的数值实验,得到了比较满意的结果,表明这一改进是有效的.对同一低雷诺数不同低马赫数的定常圆柱绕流所做的数值实验,均得到了满意的结果,表明了方法的适用性.
Roe format to calculate low Mach number flow, the need to use pretreatment technology.In pretreatment technology, you need to select the appropriate pretreatment parameters, but sometimes difficult to find, and thus can not be a reasonable calculation results.From numerical experiments, we found that the use of Pretreatment method, the numerical viscosity of the format has a significant impact on low-speed flow simulation.It is proposed to add adjustable parameters in the preprocessed Roe format to control the numerical viscosity of the calculation results.Adjustable numerical viscosity parameters The numerical viscosity of the preprocessed Roe format is closer to the true dissipation of low velocity flow and reflects the real physical phenomenon of low velocity flow.Numerical experiments on steady flow at low Reynolds number of the flow in the cavity and the circular flow around the cylinder are satisfactory The results show that this improvement is effective.Numerical experiments on the same low Reynolds number with different low Mach numbers of steady circular flow around a cylinder have been satisfactorily achieved, which shows the applicability of the method.