[Thyme]

Hi ,

I am trying to create a porous zone as a part of my geometry. I set all the setting in the topoSetDict and fvOptions file. When I run topoSet in the terminal I get "cellSet porousCellset now size 0" and "cellZoneSet porousCells now size 0". I need to mention this is a 2D simulation so in the blockMeshDict file I set the Z-axis size to 1. I will attach these folders to this message. I would appreciate if anyone can help me on why the size of my porouszone is 0.

Thanks in advance

[crubio.abujas]

Hi Thyme,

If you're getting a set of size 0 the most probable cause is that your box is outside the domain of the mesh. To check the domain you can use the command checkMesh, inside the checking geometry you will get the bounding box of your domain.

Checking geometry...
    Overall domain bounding box (-0.0206 -0.0254 -0.0005) (0.29 0.0254 0.0005)
    Mesh has 2 geometric (non-empty/wedge) directions (1 1 0)
    Mesh has 2 solution (non-empty) directions (1 1 0)
    All edges aligned with or perpendicular to non-empty directions.
    Boundary openness (-1.74458e-19 3.10465e-18 2.11178e-15) OK.
    Max cell openness = 2.21044e-16 OK.
    Max aspect ratio = 8.1407 OK.
    Minimum face area = 1.68589e-07. Maximum face area = 5.14451e-06.  Face area magnitudes OK.
    Min volume = 1.6902e-10. Max volume = 3.83579e-09.  Total volume = 1.4516e-05.  Cell volumes OK.
    Mesh non-orthogonality Max: 5.95045 average: 1.63034
    Non-orthogonality check OK.
    Face pyramids OK.
    Max skewness = 0.260575 OK.
    Coupled point location match (average 0) OK.

Ensure that the box on the topoSetDict is inside the domain. To discard other problems you may change the boundaries of the box to your entire domain, just to ensure you get a different output.

[Thyme]

Thanks a lot for your help
The problem was that I did not convert the size to meter when I introduced the porous box.