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July 28, 2014, 18:36 |
BC for MRF simpleFoam
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#1 |
Senior Member
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Hi all,
I have the following case to simulate with OF 2.3.0. https://www.dropbox.com/s/19eranpb56...WHOLE_CASE.png It's about a radial fan inside a complex geometry, where you can see on following picture that: red are patches for inlet, while blue are patches for outlet, other are wall. plus there's a rotating frame (cellZone) for the fan. Considering no turbulent model at all I set up following BC: U: Code:
boundaryField { inlet { type pressureInletVelocity; phi phi; value uniform (0 0 0); } outlet { type inletOutlet; phi phi; inletValue uniform (0 0 0); value uniform (0 0 0); } wallComp { type fixedValue; value uniform (0 0 0); } boccaglio { type fixedValue; value uniform (0 0 0); } blade { type fixedValue; value uniform (0 0 0); } wallAsp { type fixedValue; value uniform (0 0 0); } wallMan { type fixedValue; value uniform (0 0 0); } tubi { type fixedValue; value uniform (0 0 0); } wallExt { type fixedValue; value uniform (0 0 0); } } Code:
boundaryField { inlet { type totalPressure; p0 uniform 0; phi phi; U U; rho none; psi none; gamma 1.4; } outlet { type fixedValue; value $internalField; } wallComp { type zeroGradient; } boccaglio { type zeroGradient; } blade { type zeroGradient; } wallAsp { type zeroGradient; } wallMan { type zeroGradient; } tubi { type zeroGradient; } wallExt { type zeroGradient; } } Just below the fan there's the suction chamber for the fan. I would expected a (-p) value on this volume, but the pressure plotted is equal to 0; while on discharge line I would expected a (+p) value. https://www.dropbox.com/s/8ea57zltlyrd8kk/SLICE_P.png Experimentally if I perform a measure with a differential pressure gauge between suction and discharge, I'm able to measure the overall static pressure for the fan: so the total Dp. Are results consistent with the BC I set up at inlet & outlet, so pressure shall reach zero value according to the mathematical model? or should I change my BC because effectively, as there's no physical meaning for this solution? Last edited by student666; July 29, 2014 at 03:24. |
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July 29, 2014, 11:12 |
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#2 |
Senior Member
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is there anybody who can help me, please?
To ask in other way, I would like to understand, after setting rotational speed for the fan, how much is the pressure loss on air channel due to several bends, ecc... My doubt is to understand if the BC I applied are consinstent with the solution, and which are the excpected BC to obtain what the total static pressure for the fan inside this particular channel. Thanks a lot. |
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