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-   -   Why doesn't coarsening occur during grid adapting? (http://www.cfd-online.com/Forums/fluent/43688-why-doesnt-coarsening-occur-during-grid-adapting.html)

A. S. February 9, 2007 11:13

Why doesn't coarsening occur during grid adapting?
 
Hi all,

I am running a complicated geometry with turbulence and trying to adapt my grid so that wall Y+ will fall into an acceptable range. To do this, I am using the Adapt menu feature to adapt by Wall Y+.

When I click Mark, the feature shows me that 0 cells need refinement and that a lot of cells need coarsening. When I click Adapt, however, nothing happens-- the same grid wrong grid is given as the output (0 change in cells, faces, etc).

I am working in a 3D geometry with tetrahedral cells (T Grid). I think that Fluent will only let me refine and not coarsen-- why is this?

Thanks in advance, AS

HSeldon February 9, 2007 12:22

Re: Why doesn't coarsening occur during grid adapt
 
Hi, I think that coarsening only ocurrs with conformal adaption. Make sure that you have enabled that option in "Controls" menu. And also, I think that if the node/s you want to coarse is on a boundary Fluent won´t adapt it.

Hope this help!

John July 11, 2011 17:00

Quote:

Originally Posted by HSeldon
;139011
Hi, I think that coarsening only ocurrs with conformal adaption. Make sure that you have enabled that option in "Controls" menu. And also, I think that if the node/s you want to coarse is on a boundary Fluent won´t adapt it.

Hope this help!

Hi all,

It is true that refined mesh on boundary can not coarsen?

Thanks,
John


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