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boundary conditions in compressible flow

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Old   February 26, 2007, 01:50
Default boundary conditions in compressible flow
  #1
mohnish
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I m studying supersonic flow behaviour through nozzles.I m unable to identify the boundary condition at outlet of diverging part of nozzle which always behaves like diffuser instaed of nozzle.

so anyone who can help is welcome.
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Old   March 1, 2007, 05:35
Default Re: boundary conditions in compressible flow
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ravindra
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hi whether at inlet the flow is subsonic or supersonic? if at inlet of nozzle the flow is subsonic then divergent acts as not diffuser, rather it will increase velocity.

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Old   March 1, 2007, 07:23
Default Re: boundary conditions in compressible flow
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mohnish
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Actually,I m using convergent-divergent nozzle to get supersonic conditions at outlet(divergent part)from subsonic inlet conditions at convergent part of nozzle.But i m not able to identify boundary conditions(i m giving pressure inlet & outlet BC)which can yield the result.
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Old   March 9, 2007, 04:58
Default Re: boundary conditions in compressible flow
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ravindra
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hi first of all before the convergent portion, u should give some area of 3 or four times the convergent diameter and then prescribe the pr inlet boundary at that end and at divergent portion u give pr outlet boundary condition. initially while solving u decrease the urf and try to gradually increase it, such that at convergence the urf should come to default. ok

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