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3D Reactor PitzDaily [simpleFoam]

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Old   June 3, 2021, 11:26
Question 3D Reactor PitzDaily [simpleFoam]
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troth
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Hello everyone. I'm new in openFoam and I'm trying to model flows in a 3D reactor. My idea was to do it with simpleFoam and I decided to use the tutorial PitzDaily. I did the geometry with sketchup and the mesh with Gmsh. Afterwards I used GmshToFoam and I edit the 0 folder files following the instructions of this video: https://www.youtube.com/watch?v=CMchl-1d-zI&t=218s

I run it and nothing happens. It "runs" until time =23 but actually nothing happens (see screenshot).

I attach the folders, but I had to eliminate files in the polymesh folder since it was too heavy but I left the boundary file. I tried to upload the mesh as well but I think it is not possible. If someone knows how, I could do it. I atached also a screenshot of my geometry with the mesh and the console.

I would appreciate so much any orientation on what am I doing wrong or missing.

Thank you very much in advance!
Attached Images
File Type: jpg reactor.jpg (49.2 KB, 7 views)
File Type: png code.PNG (53.9 KB, 9 views)
Attached Files
File Type: zip my_pitz.zip (34.8 KB, 3 views)
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Old   June 3, 2021, 14:23
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Domenico Lahaye
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Are you sure that inlet velocity is in negative z-direction?

What happens at (slightly) higher inlet velocities?

Have you considered monitoring velocity components by e.g. printing them to screen using a limited at high values.

(https://www.openfoam.com/documentati...-velocity.html) using settings in fvOptions dictionary
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Old   June 4, 2021, 10:42
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Quote:
Originally Posted by dlahaye View Post
Are you sure that inlet velocity is in negative z-direction?

What happens at (slightly) higher inlet velocities?

Have you considered monitoring velocity components by e.g. printing them to screen using a limited at high values.

(https://www.openfoam.com/documentati...-velocity.html) using settings in fvOptions dictionary
Hi dlahaye,

thank you so much for taking the time to answer, I really appreciate it. You were right! I added in the system folder one fvOptions file from another tutorial and I include the "limitU" as follow:

Code:
limitU
{
    type            limitVelocity;
    active          yes;

    selectionMode   all;
    max             10;
}

I run it again and now it works!! thank so much.

Nevertheless I'm not sure if my result is ok (screenshot) as it seems that the velocity throughout the reactor is higher than at the inlet. Any idea of what can be wrong?. I set inlet velocity 1 m/s and in the -z (I thinks that is the correct direction but you can check it in the screenshot).

Thank you!
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File Type: jpg reactor.jpg (23.1 KB, 3 views)
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