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-   -   High aspect ratio problem.... (http://www.cfd-online.com/Forums/main/93662-high-aspect-ratio-problem.html)

smjl October 22, 2011 23:10

High aspect ratio problem....
 
I am currently solving Euler eqn from my compressible SIMPLE algorithm using structured grids. On some high-aspect ratio grids, convergence is slow and it sometimes fails. I found that happened when the gradient of variable( u v p ...) is large where the aspect ratio of grid is also large. It's just a small region, but make the convergence slow. then i changed second order upwind scheme to first upwind , everything became ok. I don't known why? Does second order scheme makes that happened? and how should i do to solve this problem if i want to get second order accuracy?:(

Far October 23, 2011 05:48

reduce the CLF number


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