I am using Hex-Dominant Automatic (CFD Only) meshing and the result is an external mesh rather than internal. I have using this for several weeks and it always created an internal mesh. Starting yesterday, it is now creating an external mesh which is clearly not correct. I don’t believe I am doing anything different this time.
Here is the project.
Unfortunately, I have now used up a lot of core hours trying to figure out what has gone wrong.
Update - If I choose parametric CFD, I notice that the default material point is outside of the geometry. I think the issue with the Automatic is that the default material point is not inside the object which it always should be for that type of mesh.
OK so I was able to create the mesh with the parametric option but there was one odd thing about the results. Last week, when the automatic option was working, I set the fineness to level 3 - Moderate. Now when I used the parametric option, I created a refinement for all surfaces for level 3. However, the parametric mesh is much much finer than the automatic mesh. Does the fineness level mean different things for the two options?
Here is the mesh properties for the automatic option:
Nodes 919271
1D elements (edges) 0
2D elements (faces) 2519901
3D elements (volumes) 804417
And here it is for the parametric option (with same fineness):
Nodes 4269830
1D elements (edges) 0
2D elements (faces) 11804329
3D elements (volumes) 3775290
Thanks, I had read that before but it really doesn’t explain the relationship between that option and the automatic option. In other words, I would like to know how the parametric setup would have to be in order to match the automatic setup.
some feedback about your question: So it is a bit complicated to get the exact same parametric and automatic meshes, since the base mesh box of the mesh is determined based on the fineness settings.
I will tag my colleague @jprobst here. He might give you some useful information and maybe something like a rule of thumb that you can work with.
Thanks for the response. It isn’t terribly important but it would be nice just to get a high level view of how the automatic settings are determined. Clearly, the resolution numbers between the two do not appear linked (i.e. 3<>3 for both). But any clarification would help.
Regarding my original post regarding the problem of the automatic meshing, I am now experiencing the same problem with the Parametric Mesh. Even though the surface is water tight and the mesh point is inside the solid body, the mesh is created on the outside of the body.
The new project has two geometries. The first meshed fine but the second which had a slight modification to the geometry, meshed outside the object even though the settings were identical.
