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Difficulty in simulating pressure driven flow using pimpleFoam |
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March 2, 2021, 01:47 |
Difficulty in simulating pressure driven flow using pimpleFoam
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New Member
parth
Join Date: Feb 2020
Posts: 23
Rep Power: 6 |
Dear community,
I am very new to OpenFOAM as well as to CFD. I am trying to simulate pressure-driven flow (geometry is similar to an inverted L shape, where the inlet is at the bottom), where we apply time-dependent pressure at the inlet and measuring the mass flow rate at the outlet. While I am able to run the simulation without any error. However, the outlet mass flow rate is 2 orders lower than lumped simulation. Here, I have taken sodium as working fluid (however I assume that wont make any difference, since I have divided the pressure with the sodium density, and provided appropriate viscocity in transport properties.) I would be grateful if any of you can point out where I am doing wrong. My velocity and pressure boundary is as follows: Velocity boundary conditions: Code:
dimensions [0 1 -1 0 0 0 0]; internalField uniform (0 0 0); boundaryField { inlet { type pressureDirectedInletOutletVelocity; inletDirection uniform (0 0 1); value uniform (0 0 0); } walls { type noSlip; } wedge1 { type symmetry; } wedge2 { type symmetry; } top_walls { type noSlip; } outlet { type pressureInletOutletVelocity; value uniform (0 0 0); } interface3 { type empty; } interface4 { type empty; } } Code:
dimensions [0 2 -2 0 0 0 0]; internalField uniform 0; boundaryField { inlet { type uniformTotalPressure; p0 table ( ); } outlet { type totalPressure; p0 uniform 0; value uniform 0; } walls { type zeroGradient; // type fixedFluxPressure; // value uniform 0; } top_walls { type zeroGradient; // type fixedFluxPressure; // value uniform 0; } wedge1 { type symmetry; } wedge2 { type symmetry; } defaultFaces { type empty; } interface3 { type empty; } interface4 { type empty; } } Code:
transportModel Newtonian; // Laminar viscosity nu 2.16e-04; // Thermal expansion coefficient beta 3.0164e-4; // Reference temperature TRef 873; // Laminar Prandtl number Pr 0.0044; // Turbulent Prandtl number Prt 0.85; |
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mass flow rate, pimplefoam, pressure driven flow |
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