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Total pressure compressible flow

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Old   October 31, 2017, 07:18
Default Total pressure compressible flow
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cyril dsouza
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hello all,
I am working on scramjet inlet
i want total pressure recovery
so when we calculated total pressure results from fluent and OpenFoam are very different.
rest pressure(static),density,MachNO.velocity matches well.

fluent uses formula
Pt = Po *(1+ (kappa-1)*M^2 /2)^(kappa/kappa-1)

for openFoam i used postProcess utility totalPressureCompressible
results are not matching up
can u guys help
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Old   November 1, 2017, 04:47
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Tom Fahner
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That is because OpenFOAM uses:

p_t=p_{ref}+p+0.5*\rho*U^2
which should equal the Fluent value only in isentropic flow conditions.

You can find some explanation on the funtionObjects in the cpp source guide

I would suggest to use a ParaView calculator to use the same formulation as Fluent.

Regards,
Tom

Last edited by tomf; November 1, 2017 at 04:48. Reason: messed up the order
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compressible flow, hypersonic flow, postprocess, total pressure

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