我在流场计算中出现了如下错误提示:
1. Coefficient matrix has a negative diagonal. Probably indicates
divergent solution.
VX Node= 370
2.Negative or zero temperatures may be avoided by either mesh refinement
or modified inertial relaxation especially if Petrov-Galerkin
formulation is used for the energy equation(FLDA,ENRG,SUPG,T). 但网格已经很细化了,还是不行
3. CG methods(这是共轭梯度法的意思吗)严重不对称求解终止,但是我检查加载基本是对称的啊
想问一下,上面三种错误提示出现的可能原因和经验解决方法一般是什么?