Issue in Mesher

[jomidi]

Hello
I am modeling a geometry including two cylinders that are connected together with a box.
Enclosed is my model.
My model will be the CFD-DEM model.
I have no inlet or outlet in this system.
I have created this model, but I have one main problem:
In Mesh, I have this error:

FATAL Error: There are no standard fluid cells in the computation
Please verify geometry and mesh settings.
If using an STL file to define the geometry, this may be due to
normal vectors pointing in the wrong direction.
Model.mfx (7.3 KB)

I really appreciate your help if you could help me model this simple geometry.
This is my first model in MFiX and I am a little bit confused with this environment.

[cgw]

Hi Javad.
The error message is telling you what the problem is. Your normal vectors are pointing the wrong direction.

You can check the normals by clicking “Show normals” in the Geometry view, you may need to reduce the scale of the normal arrows to make the view uncluttered:

Then after unchecking ‘Flip normals’ I was able to run your case:

[jomidi]

Hi, many many thanks for your time and your help, I will try it!