Reply To: ICFD Mesh error: Surface Collapse not possible to locate

[Reno Genest]

Hello Arnaud,

I did not find any information on this error message in our knowledge database. I will ask the developer.

In the meantime, could you post a screenshot of your surface mesh?

Maybe your geometry is "thin" and the surface mesh is not fine enough to get a volume mesh? Try refining the surface mesh and use a similar volume mesh size using *MESH_SIZE and *ICFD_CONTROL_MESH.

Also, do you have boundary layers? Adaptive meshing? Or other features in your mesh? I would try to simplify the mesh controls as much as possible and see if you can get a successful mesh. Then, add complexitties one-by-one. 

As a workaround, you could use your own volume (tet) mesh. Here is more information from the ICFD training course:

"Usermesh
•
First modification: Since the volume is now directly built by the user, the fluid nodes
and elements no longer correspond to surfaces but are directly linked to the fluid
volume
•
Consequently, The *MESH_SURFACE_ELEMENT and *MESH_SURFACE_NODE cards are
now replaced by respectfully the *MESH_VOLUME_ELEMENT card which works in a
similar way as *ELEMENT_SOLID in 3D cases and as *ELEMENT_SHELL in 2D cases, and
the *MESH_VOLUME_NODE card.
•
The *MESH_VOLUME keyword is no longer needed.
•
The Part ID associated to the *MESH_VOLUME_ELEMENT keyword is associated to a
*ICFD_PART

In order to define boundary conditions *ICFD_SET_NODE_LISTs have to be defined and
associated to the *ICFD_PARTs. The format of this keyword is similar to SET_NODE_LIST
*ICFD_SET_NODE_LIST
SID
: Node Set
PID
: *ICFD_PART ID associated to the Node

"

 

Reno.