@浪迹天大 是这样的,我最近也在读OpenFOAM中LES模型,发现Lund提到
The nearly universal approach is to simply write down the filtered Navier-Stokes equations together with an assumed model for the subgrid-scale stresses and then apply the desired spatial discretization to this “filtered” system. Although it is rarely mentioned, what one is doing by adopting this procedure is to imagine that the finite support of the computational mesh together with the low-pass characteristics of the discrete differentiating operators act as an effective filter. One then directly associates the computed velocity field with the filtered velocity. This procedure will be referred to as implicit filtering since an explicit filtering operation never appears in the solution procedure.
也就是说OpenFOAM程序除了动态模型外都没有对N-S方程进行显式的滤波操作,那么我们在方程植入中只要修改$\nu_{sgs}$就OK了,我在后面会做几个滤波函数的选择的对比,看看最后结果一样不一样
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内存频率提高对电脑性能几乎没有什么影响的
反而会因为加重CPU负担,影响CPU超频,对电脑稳定性产生影响
所以一般建议都是买频率低一点的,2133的频率就可以了
LES和RANS在代码中实现过程是怎样的?
高频内存对CFD的计算速度有帮助吗?