# convergence

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 September 11, 2001, 03:33 convergence #1 sreekanth Guest   Posts: n/a What is the efect of cell size on convergence rate, using unstructured grid.

 September 11, 2001, 05:14 Re: convergence #2 Jin-Wook LEE Guest   Posts: n/a Ingeneral, cell size itself has not the major effect on the convergence. But, in general, coarse grid has better convergence. Mesh skewness, edge ratio(dx_i/dx_(i-1) ...) and aspect ratio have critical effect on the convergence. Sincerely, Jinwook

 September 11, 2001, 22:13 Re: convergence #3 Dan Williams Guest   Posts: n/a What type of convergence do you mean in this case? Convergence to a mesh independent solution, which is somewhat tricky to guage on an unstructured grid. Or, convergence of residuals of algebraic equations? Dan.

 September 12, 2001, 03:38 Re: convergence #4 sreekanth Guest   Posts: n/a The convergence in FEM used to unstructured grids is of the order of cube of h(cell size parameter,less than 1.0). What is the trend in FVM used to unstructured grid?

 September 12, 2001, 05:12 Re: convergence #5 Kang, Seok Koo Guest   Posts: n/a The convergence always depends on the CFL number when we use explicit scheme. CFL number on unstructured grid generally depend on the volume/area of a control volume. When the mesh size is very small, the time step must be reduced to get the converged solution. In my experience, if a mesh is not highly stretched, geometry of a mesh is not an important factor.

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