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Forum: Main CFD Forum

February 19, 2013, 02:40

Replies: 9

BC for compressible flows

Views: 1,274

Posted By nickna

I am solving the NS equations, using the explicit...

I am solving the NS equations, using the explicit MacCormack scheme. Time step is from the stability criterion and much smaller time step was also tried, but still diverge.
Because flow is...

Forum: Main CFD Forum

February 18, 2013, 19:15

Replies: 9

BC for compressible flows

Views: 1,274

Posted By nickna

Dear Duri, Thanks. I tried different BC,...

Dear Duri,
Thanks. I tried different BC, including yours (let pressure gradient =0 and the wall temperature is fixed.) But always failed. One observation may be helpful: I reduced the inlet velocity...

Forum: Main CFD Forum

February 18, 2013, 19:09

Replies: 9

BC for compressible flows

Views: 1,274

Posted By nickna

Dear Andy, Thanks. The outlet is given static...

Dear Andy,
Thanks. The outlet is given static pressure and the inlet is from extrapolation of two interior points' pressure, because I specify the inlet velocity (both direction and magnitude). From...

Forum: Main CFD Forum

February 17, 2013, 08:17

Replies: 9

BC for compressible flows

Views: 1,274

Posted By nickna

BC for compressible flows

Dear all,
A basic problem, which I thought should be quite simple, puzzles me a long time...
For compressible simulations (still subsonic, Mach is about 0.7) of flow passing a square block, the...

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