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-   -   Why does the errors oscillate strongly in my multigrid method? (http://www.cfd-online.com/Forums/main/69291-why-does-errors-oscillate-strongly-my-multigrid-method.html)

hadesmajesty October 19, 2009 03:29

Why does the errors oscillate strongly in my multigrid method?
 
I am solving a two-dimensional Poisson equation with two-level V-cycle.
However, I observe that my errors and residuals decrease with oscillation. In addition, the convergence is slower than single grid. Can anybody tell me how to detect what is wrong?

Thank you.


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