Error in compressible flow

December 26, 2007, 23:19

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

December 27, 2007, 08:43

1) search in the forum for "Negative densities found at more than 100 cells"

2) reduce the unterrelaxation for density

December 26, 2007, 23:19	Error in compressible flow	#1
krish Guest Posts: n/a	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

December 27, 2007, 08:43	Re: Error in compressible flow	#2
Balduin Bankerotti Guest Posts: n/a	1) search in the forum for "Negative densities found at more than 100 cells" 2) reduce the unterrelaxation for density

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