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-   -   Error in compressible flow (http://www.cfd-online.com/Forums/cd-adapco/56404-error-compressible-flow.html)

krish December 27, 2007 00:19

Error in compressible flow
 
Hi all,

I am doing compressible flow(air) analysis.

Inlet boundary condition = velocity = 39 m/s( constant mass flux) Outlet pressure boundary = 1 bar.

After some time i am getting this error

*** WARNING #060 *** DENSITY OUT OF BOUND DUE TO PRESSURE CORRECTION AT CELL 1 DENSITY= -1.8867E+00 LIMITER APPLIED

Finally it says

"Negative densities found at more than 100 cells" RUN STOPPED.

Please give me some suggestions to sort this problem.

Regards Krish

Balduin Bankerotti December 27, 2007 09:43

Re: Error in compressible flow
 
1) search in the forum for "Negative densities found at more than 100 cells"

2) reduce the unterrelaxation for density


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