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griff02 March 18, 2010 20:15

Meshing
 
Hi
I am trying to describe why distorted elements give bad results in FEA and CFD programs for my final year project and cannot find an explanation anywhere. Can anyone help???
Thanks
Oli

jchawner March 20, 2010 13:57

Oliver:

Here's a place to start: distortion may reduce numerical accuracy because numerical approximations are no longer centered (or symmetric) about the centroid of the volume element. (from http://www.flow3d.com/cfd101/cfd101_grid.html)

Ahmed March 20, 2010 14:25

no matter what discretisation scheme is used, you end up with a matrix that has to be solved.
see what causes the solution of a matrix difficult/inaccurate then trace it back to the distorted mesh elements

julien.decharentenay March 22, 2010 08:30

You may be interesting in reading through http://powerlab.fsb.hr/ped/kturbo/Op...jeJasakPhD.pdf

The section on discretisation contains a discussion on orthogonality and others things to pay attention to in the meshing process.

griff02 March 23, 2010 08:06

Thanks guys, this is really helpful


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