Accuracy, Convergence and Mesh Quality

Here’s a good blog post for all those CFD modelling experts out there 😉

Another Fine Mesh - A Pointwise Blog

[This article was first published in the May/June 2012 issue of The Connector. It was so popular there it’s reposted here to reach a broader audience.]

“We know embarrassingly little about how the mesh affects the CFD solution,” said Prof. Carl Ollivier-Gooch of the University of British Columbia.

That statement is counter to what we all know to be true in practice, that a good mesh helps the computational fluid dynamics (CFD) solver converge to the correct answer while minimizing the computer resources expended. Stated differently, most every decent solver will yield an accurate answer with a good mesh, but it takes the most robust of solvers to get an answer on a bad mesh.

The crux of the issue is what precisely is meant by “a good mesh.” Syracuse University’s Prof. John Dannenhoffer points out that we are much better at identifying a bad mesh than we…

View original post 2,459 more words

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