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April 28, 2018, 02:57 |
Inflow moving in wrong direction
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#1 |
New Member
Kahlil Fredrick Cui
Join Date: Apr 2018
Posts: 29
Rep Power: 8 |
Greetings!
I am simulating a very simple scenario of fluid entering through an inflow patch, overcoming a static boundary and exiting through an outflow. Very similar to the weir overflow in interfoam. My problem is that, instead of flowing in the x-direction, the flow goes up! I tried my boundary conditions on the blockMesh of the dambreak example, and it seemed to work fine, indicating that the problem is with my geometry. Here is my blockMesh Code:
convertToMeters 1; vertices ( (0 0 0)//0 (2 0 0)//1 (3 0 0)//2 (5 0 0)//3 (0 1 0)//4 (2 1 0)//5 (3 1 0)//6 (5 1 0)//7 (0 1.5 0)//8 (2 1.5 0)//9 (3 1.5 0)//10 (5 1.5 0)//11 (0 5 0)//12 (2 5 0)//13 (3 5 0)//14 (5 5 0)//15 (0 0 0.5)//16 (2 0 0.5)//17 (3 0 0.5)//18 (5 0 0.5)//19 (0 1 0.5)//20 (2 1 0.5)//21 (3 1 0.5)//22 (5 1 0.5)//23 (0 1.5 0.5)//24 (2 1.5 0.5)//25 (3 1.5 0.5)//26 (5 1.5 0.5)//27 (0 5 0.5)//28 (2 5 0.5)//29 (3 5 0.5)//30 (5 5 0.5)//31 ); blocks ( hex (0 1 5 4 16 17 21 20) (30 30 15) simpleGrading (1 1 1) hex (2 3 7 6 18 19 23 22) (30 30 15) simpleGrading (1 1 1) hex (4 5 9 8 20 21 25 24) (30 15 15) simpleGrading (1 1 1) hex (6 7 11 10 22 23 27 26) (30 15 15) simpleGrading (1 1 1) hex (8 9 13 12 24 25 29 28) (30 60 15) simpleGrading (1 1 1) hex (9 10 14 13 25 26 30 29) (30 60 15) simpleGrading (1 1 1) hex (10 11 15 14 26 27 31 30) (30 60 15) simpleGrading (1 1 1) ); edges ( ); boundary ( inlet { type patch; faces ( (0 16 20 4) ); } outlet { type patch; faces ( (7 23 19 3) ); } leftWall { type wall; faces ( (4 20 24 8) (8 24 28 12) ); } rightWall { type wall; faces ( (11 27 23 7) (15 31 27 11) ); } lowerWall { type wall; faces ( (0 1 17 16) (1 5 21 17) (9 10 26 25) (10 6 22 26) (6 2 18 22) (2 3 19 18) ); } atmosphere { type patch; faces ( (12 28 29 13) (14 13 29 30) (14 30 31 15) ); } ); To further clarify my U: Code:
dimensions [0 1 -1 0 0 0 0]; internalField uniform (0 0 0); boundaryField { inlet { type fixedValue; value uniform (1 0 0); } outlet { type zeroGradient; } leftWall { type fixedValue; value uniform (0 0 0); } rightWall { type fixedValue; value uniform (0 0 0); } lowerWall { type fixedValue; value uniform (0 0 0); } atmosphere { type pressureInletOutletVelocity; value uniform (0 0 0); } defaultFaces { type empty; } } Code:
dimensions [1 -1 -2 0 0 0 0]; internalField uniform 0; boundaryField { inlet { type zeroGradient; } outlet { type totalPressure; p0 uniform 0; U U; phi phi; rho rho; psi none; gamma 1; value uniform 0; } leftWall { type fixedFluxPressure; value uniform 0; } rightWall { type fixedFluxPressure; value uniform 0; } lowerWall { type fixedFluxPressure; value uniform 0; } atmosphere { type totalPressure; p0 uniform 0; U U; phi phi; rho rho; psi none; gamma 1; value uniform 0; } defaultFaces { type empty; } } The simulation results are attached as an image. The error might be very simple. If you could just point me in the right direction, i'd be really grateful! |
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May 1, 2018, 15:21 |
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#2 |
Senior Member
Marco A. Turcios
Join Date: Mar 2009
Location: Vancouver, BC, Canada
Posts: 740
Rep Power: 28 |
Hi there,
Could you upload a stripped version of your case with all the BC's. I'm thinking perhaps your alpha field might have issues? If you suspect your geometry, does checkmesh work? |
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May 1, 2018, 22:22 |
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#3 |
New Member
Kahlil Fredrick Cui
Join Date: Apr 2018
Posts: 29
Rep Power: 8 |
Hello!
Thanks for the response, but I already figured out the error. I should've updated this question then. I apologize. I actually found out that one of my floor faces was undefined. Weird thing was it didn't turn up during checkMesh. When I re-created the whole mesh, I found out I neglected one face. I also didn't expect the fluid to behave that way as a reaction to a missing face. Hope my error becomes a lesson for someone else. |
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dambreak, inflow bc, outflow bc |
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