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-   -   Continuity residual (http://www.cfd-online.com/Forums/fluent/29545-continuity-residual.html)

Ferraris March 21, 2002 16:55

Continuity residual
 
hi every one :

I have a little problem with the conticuity residual. I m modelling a 3d natural convection problem and it seems not easy reduce this residual in particular. I am using linear aproximation of the density like force source in the momentum equation, and i m not sure what this continuity residual means.

I could not find this explanation in the manuals .

Thank you in advance.

Sergio

Jin-Wook LEE March 22, 2002 02:03

Re: Continuity residual
 
You can be advised by the Fluent's 'HELP' option.

Help --> Index --> Definition of residuals.

Sincerely, Jinwook


Greg Perkins March 22, 2002 06:21

Re: Continuity residual
 
I've found that often problems with continuity stem from a poor mesh. Making a better mesh often helps the continuity equation residuals.

(though I've done very little natural convection..)

An easy way to check is to use grid adaption on your existing grid in regions where residuals are high. If this works, you can then go back and create a better starting grid. I also suggest using hexas or quads if possible in preference to tets and tris.

Greg


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