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Unrealistic supersonic pockets at pressure inlet |
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March 7, 2015, 16:52 |
Unrealistic supersonic pockets at pressure inlet
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Join Date: Aug 2013
Location: Italy/UK
Posts: 24
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Hi!
For my undergrad project I am trying to simulate an airfoil in a wind tunnel using the sonicFoam solver. I run the case on a big domain with fixed velocity inlet and worked fine. When moved to pressure inlet I am struggling. As you can see from the picture with the bent duct, there are pockets of insanely high speeds (up to Mach 9). The boundary conditions are fixed value (1.6 bar and 1 bar wave trasmissive) at both the inlet and outlet and the velocity BC are fixedGradient. I am trying to achieve inlet velocity of Ma 0.4 and this should be done by having constant pressure inlet. I have been trying everything and pretty desperate right now. When testing the pressure conditions with the big domain, i dont get the pockets but the strange flow pattern near the outlet. What am I getting wrong?! U dimensions [ 0 1 -1 0 0 0 0 ]; internalField uniform (0 0 0); boundaryField { back { type zeroGradient; } front { type zeroGradient; } top { type fixedValue; value uniform ( 0 0 0); } right { type zeroGradient; } bottom { type fixedValue; value uniform ( 0 0 0); } left { type pressureInletVelocity; value uniform (0 0 0); } foil { type fixedValue; value uniform ( 0 0 0); } } P dimensions [ 1 -1 -2 0 0 0 0 ]; internalField uniform 100000.0; boundaryField { back { type zeroGradient; } front { type zeroGradient; } top { type zeroGradient; } right { type waveTransmissive; field p; phi phi; rho rho; psi thermosi; gamma 1.3; fieldInf 100000; lInf 1; value uniform 100000;; } bottom { type zeroGradient; } left { type fixedValue; value uniform 160000.0; } foil { type zeroGradient; } } Thank you so much |
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