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BC for an "artificial outlet" which is inside the fluid domain in reality |
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Join Date: Aug 2020
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Hello everyone,
I am simulating a decanter centrifuge with MRF method. In reality it is two-phase flow for solid-liquid but I am simlulation single phase (water) with pimpleFoam for now. The actual geometry has one inlet and two outlets (one for clarified liquid, one for discharged solid particles) Because I wasn't interested in the whole geometry I cutted the geometry along its length (x-Axis). So I don't have the outlet patch for particles anymore but instead I have an outlet patch which was actually inside the geometry before. In reality, through this patch my suspension should continue flowing to the actual outlet patch for particles. I don't know which BC I should use for that outlet patch, as it is not a real outlet patch where the fluid would flow out of the domain. I made my first simulations using fixedPressure for p and giving a small random fixedValue for U (1e-5 0 0). You can see the pressure field in attached image. (Cylindrical end is where the clarified fluid goes out and the conical end is the outlet I am asking for help) But as it is a random given value I am not sure if it is the right approach or not. I thought I could use zeroGradient for velocity but then I am not sure what I should use for pressure as I can't set the pressure to zeroGradient as well. The patch is also rotating. For my other patches I used: U Code:
inlet_feedPipe { type flowRateInletVelocity; volumetricFlowRate 2.78e-5; value $internalField; } outlet_liquid { type zeroGradient; } outlet_liquidConus { type fixedValue; value (1e-5 0 0); } Code:
inlet_feedPipe { type zeroGradient; } outlet_liquid { type fixedValue; value 0; } outlet_liquidConus { type zeroGradient; } I would really appreciate if you could help me as I am stuck on my master thesis now. Best regards, Ayca Last edited by decanter; December 16, 2020 at 04:04. |
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Tags |
boundary conditons, mrf, totalpressure bc |
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