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July 23, 2018, 05:26 |
overpressure room
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#1 |
New Member
Aurélien Mingot
Join Date: Jun 2018
Location: London
Posts: 6
Rep Power: 7 |
Hi
I have a little question with the buoyantBoussinesqSimplefoam solver. I run a simulation for a room with supply and extract system air. But It works only when supply flow=extract flow otherwise I have continuity error message. I would like to know if we can simulate an overpressure room even if buoyantBoussinesq is for incompressible flow. I would like to know if it possible without using potentialfoam. I have for p zeroGradient ( supply qnd extract) for U flowRateInletVelocity ( supply) flowRateOutletVelocity ( extract) for p-rgh fixedFluxPressure uniform 0 (supply and extract ) Thanks a lot Aurélien Have a nice day |
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July 23, 2018, 06:45 |
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#2 |
Senior Member
Peter Baskovich
Join Date: Jul 2014
Posts: 127
Rep Power: 11 |
Hello,
You are going to have numerical issues because the problem is constrained. Typically we setup cases with Dirichlet-Neumann partitioning, this means if you specify the value at one patch, you must specify the gradient at the alternate patch. See: BC common combinations Typically we would used a "fixed" velocity inlet and a "fixed" pressure outlet. The alternate patches get a zeroGradient condition to avoid over constraint. Try: Inlet U flowRateInletVelocity p fixedFluxPressure Outlet U fluxCorrectedVelocity p fixedMean (or just fixedValue 0, if it's unstable) These should work if there is no circulation across the patches (no inflow on an outlet etc) |
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July 23, 2018, 09:57 |
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#3 | ||
New Member
Aurélien Mingot
Join Date: Jun 2018
Location: London
Posts: 6
Rep Power: 7 |
Thanks for your answer !
So I understand now that I have to use a fixed velocity inlet with fixed pressure outlet or a fixed velocity outlet and a fixed pressure inlet, that's it ? I tried with your parameters but I have continuity errors again. I probably made mistake in my files. Quote:
and here my U file Quote:
Thanks for your link I will have a look now |
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