Meshing Error for Tank Geometry

[Akin3rd]

I have a tank geometry which I intend to use for a CFD study in OF though I have generated a satisfactory mesh using tet elements, I am trying to have a hex-dominant mesh instead; to ease the solution convergence.

I divided the geometry faces in such a way that all faces have more than 3 sides for the 2D Quadrangle:Mapping algorithm and used Hexahedron (i,j,k) algorithm for the 3D mesh and yet I still get this error: “Invalid input mesh. 2D mesh is not suitable for i,j,k hexa meshing”

Here is an attached image of the mesh :

Is there any way to resolve this?

I’m afraid the tutorials I see online are not of much help

thanks

[fred]

As you said, it is important to prepare the geometry when you want to have hexahedron mesh.
You said you take care of the faces, but don’t forget the 3D part also.

In your case I would say the issue is on the top of the tank where you have small meshes. In the 2d mesh with quadrangle, did you check the parameters to use quadrangle preference?

Other than this, it is difficult to see the issue, can you share a script of the geometry and the mesh definition?

[fred]

Here is an example:

tank_mesh.py (15,3 Ko)

[cnoyer]

Hi,

Is the geometry divided along the sewing of the cylinder ? Otherwise it might cause issues when trying to generate a 3D hexa mesh.

Could you send the study or a dump script to better help you ?

Corentin