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Old   November 12, 2018, 07:10
Default Choosing a solver.
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I am a complete beginner. I am trying so simulate water flow in a simple y pipe whose branches are 90 apart. I have already drawn the geometry in Salome and exported it to Openfoam in unv format. I used ideasUnvToFoam to make it openFoam compatible. I tried using icoFoam but I got errors. I suspect it's the boundary conditions in the u and p files. Anyone with a tip on how to go about this? Thanks
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Old   November 12, 2018, 08:59
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Originally Posted by DANIEL NDIRANGU View Post
Anyone with a tip on how to go about this? Thanks
Hey Daniel,
as in most cases when you want a helpful answer, provide more details. We know you tried icoFoam but failed, but what did the error message say? Do you try to simulate a transient flow or a steady one? Which boundary conditions do you use? Which fvSolution settings and which fvSchemes settings?

If you provide at least these infos you might get a more detailed answer and in a less amout of time. Either upload your files as an attachment or post their content in [code*][*/code] brackets (without the *).
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Old   November 16, 2018, 04:53
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Thanks Robert.

I have attached a screenshot of the error message. I tried to simulate a transient flow. My boundary conditions were; Pressure Boundary Conditions(Inlet- fixedValue, Outlet-fixedValue, walls-zeroGradient) and Velocity Boundary Conditions(Inlet-pressureInletVelocity, Outlet-zeroGradient, Walls-fixedValue). As for the fvsolution and fvSchemes settings, what settings are appropriate for my case? I run my simulation with the fvsolution and fvschemes as copied directly from the cavity case in icoFoam.

Any help or correction will be appreciated. I am an undergrad doing my final year project and I need to use openfoam
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Old   November 16, 2018, 07:01
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Your screenshot is not shown here. You can use command icoFoam > log.Error and this will create a file named as log.Error. You can post that error in here then we can see your problem. I suspect that your problem is related to the boundary file located in the constant/polyMesh directory. After you converged your mesh into the OpenFOAM format, you should look into your boundary file. Name of your boundaries in 0/U and 0/p must be same with the boundary file in the constant directory.


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Last edited by BM_CFD; November 16, 2018 at 07:01. Reason: -
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Old   November 16, 2018, 07:03
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Quote:
Originally Posted by DANIEL NDIRANGU View Post
Thanks Robert.

I have attached a screenshot of the error message. I tried to simulate a transient flow. My boundary conditions were; Pressure Boundary Conditions(Inlet- fixedValue, Outlet-fixedValue, walls-zeroGradient) and Velocity Boundary Conditions(Inlet-pressureInletVelocity, Outlet-zeroGradient, Walls-fixedValue). As for the fvsolution and fvSchemes settings, what settings are appropriate for my case? I run my simulation with the fvsolution and fvschemes as copied directly from the cavity case in icoFoam.

Any help or correction will be appreciated. I am an undergrad doing my final year project and I need to use openfoam
Hi Daniel,
i can't see you screenshot, but we can start with the the more obvious parts:
Pressure boundary condition: Inlet shoud be zeroGradient, while the outlet ist fixedValue.
Velocity: For your outlet try:

Code:
    outlet
    {
        type            inletOutlet;
        inletValue      uniform (0 0 0);
        value           uniform (0 0 0);
    }
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Old   November 24, 2018, 03:32
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Hello guys,
Sorry for not getting back earlier but Robert's solution worked. I had edited the boundary file incorrectly.
Thanks a lot
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