# Non-Reflecting B.C. in NSC2KE

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 May 27, 1999, 07:53 Non-Reflecting B.C. in NSC2KE #1 Zou Chu Guest   Posts: n/a Sponsored Links Hi, I has used unstructured FVM public code NSC2KE to simulate a traveling shock of Ms=1.5 (actually I used 2D grid to simulate 1D shock ),the outflow B.C. used NSC2KE's Steger-Warming method . So this problem is a subsonic problem and post-shock mach number < 1 . Before the shock went out of outflow B.C. the result is very good , but when the shock went out my result is very poor because the B.C. reflecting was so big that there was a density and pressure down. Then I used Thompson's non-reflecting B.C. , but the result is also poor .Could anyone help me to deal with the outgoing boundary conditions ? Thanks.

 May 27, 1999, 09:45 Re: Non-Reflecting B.C. in NSC2KE #2 Patrick Godon Guest   Posts: n/a Hi, May I suggest you to read the discussion Oleg and I had yesterday on 'BC problem'. It treats boundary conditions through the method of Characteristics. Let me know if you need more details and/or references to the litterature. Cheers, PG.

 May 27, 1999, 21:26 Re: Non-Reflecting B.C. in NSC2KE #3 ZouChu Guest   Posts: n/a Hi, Thanks for your help ! The problem has been solved by Thompson's non-reflecting B.C. (J.C.P 68,1-24,1987) using a characteristic method . I made a foolish mistake so the result is poor because I didn't convert the primitive form to conservative form . Now everything is good for subsonic and supersonic , although there is a little reflection about the most one persent and I should put this B.C. to un-regular geometry .

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