# overPimpleDyMFoam no Pressure calculated

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March 31, 2021, 08:28
DILUBiCGStab Solving for Pressure always zero
#1
New Member

Dominik Mütter
Join Date: Mar 2021
Location: Europe
Posts: 4
Rep Power: 5

I would kindly like to ask for your help with an openfoam simulation for my bachelor thesis. I am trying to simulate an oloid stirrerı, using the overPimpleDyMFoam solver with a tabulated six-degree-of-freedom motion. Please be lenient with any stupid mistakes in my setup, I am using Openfoam for roughly half a year now, and CFD in general for only a little bit longer.

More detailed description:
The case setup is derived from the examples for the overPimpleDyMFoam and pimpleFoam solvers (although I have consulted numerous other sources). The spherical refinement zone together with the oloid is the moving overset part (please note attached images). I have no in- or outflow and no free surface.

Problem:
Openfoam calculates the flow field U for the oloid, but there is no pressure gradient, and the impulse does not propagate through the whole fluid (as you can see in the image). I have the feeling there is a very simple but stupid mistake in my setup.

Code:
```Overset analysis : nCells : 2281489
calculated   : 343000
interpolated : 0 (interpolated from local:0  mixed local/remote:0  remote:0)
hole         : 1938489

Overset analysis : nCells : 2281489
calculated   : 343000
interpolated : 0 (interpolated from local:0  mixed local/remote:0  remote:0)
hole         : 1938489

DICPCG:  Solving for pcorr, Initial residual = 1, Final residual = 0.00833108, No Iterations 115
PIMPLE: iteration 1
DILUPBiCGStab:  Solving for p, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 0, global = 0, cumulative = 0
DILUPBiCGStab:  Solving for p, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 0, global = 0, cumulative = 0
DICPCG:  Solving for pcorr, Initial residual = 1, Final residual = 0.00833108, No Iterations 115
PIMPLE: iteration 1
DILUPBiCGStab:  Solving for p, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 0, global = 0, cumulative = 0
PIMPLE: iteration 2
DILUPBiCGStab:  Solving for p, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 0, global = 0, cumulative = 0
DILUPBiCGStab:  Solving for p, Initial residual = 0, Final residual = 0, No Iterations 0
DILUPBiCGStab:  Solving for p, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 0, global = 0, cumulative = 0
time step continuity errors : sum local = 0, global = 0, cumulative = 0
DILUPBiCGStab:  Solving for p, Initial residual = 0, Final residual = 0, No Iterations 0
DILUPBiCGStab:  Solving for p, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 0, global = 0, cumulative = 0
time step continuity errors : sum local = 0, global = 0, cumulative = 0
PIMPLE: iteration 2
DILUPBiCGStab:  Solving for p, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 0, global = 0, cumulative = 0
DILUPBiCGStab:  Solving for p, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 0, global = 0, cumulative = 0
smoothSolver:  Solving for epsilon, Initial residual = 0.000967702, Final residual = 3.061e-07, No Iterations 5
DILUPBiCGStab:  Solving for p, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 0, global = 0, cumulative = 0
smoothSolver:  Solving for k, Initial residual = 0.0570797, Final residual = 5.73559e-07, No Iterations 9
ExecutionTime = 1373.21 s  ClockTime = 1377 s

Courant Number mean: 0 max: 0
deltaT = 0.0159594
Time = 0.0987593

DILUPBiCGStab:  Solving for p, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 0, global = 0, cumulative = 0
smoothSolver:  Solving for epsilon, Initial residual = 0.000967702, Final residual = 3.061e-07, No Iterations 5
smoothSolver:  Solving for k, Initial residual = 0.0570797, Final residual = 5.73559e-07, No Iterations 9
ExecutionTime = 1375.99 s  ClockTime = 1381 s

Courant Number mean: 0 max: 0
deltaT = 0.0159594
Time = 0.0987593```

I created this case with openfoam 2006/2012. I attached all dictionaries (except for the overset), because I have no idea where the error may lie. Any pointers would be highly appreciated.

I wish everyone a pleasant Wednesday,
Dominik Mütter

1: Looks like this

Attached Images
 Mesh.jpg (132.9 KB, 12 views) p.jpg (30.2 KB, 13 views) U.jpg (29.7 KB, 13 views)
Attached Files
 background.zip (16.9 KB, 4 views)

Last edited by DominikMuetter; April 2, 2021 at 03:19. Reason: More information, updated Dictionaries

 April 4, 2024, 05:38 #2 New Member   tomas lopez olocco Join Date: Dec 2020 Posts: 4 Rep Power: 5 I have the same problem, could you find a solution for it?

 Tags 6dof, overpimpledymfoam, problem, question