[Other] Fluent mesh: prism layer error

Fabio88 · August 12, 2015, 05:28

Hi all,

I receive the following error when I try to create prisms in fluent mesh:
Prism Meshing is not supported for face zones of mesh objects

Below the procedure I applied in fluent meshing:
- Create geometry in cad
- import cad as mesh object and correct free nodes
- create size function for the surfaces of the body
- remesh it
- create boundary box using the construction size tool (as well as BOI, for which I un-ticked the option create object) and material point
- wrap my objects (not the box)
- group the 3 objects and the external box in one object called total
- when I go to auto mesh select the prism layer I want, fluent give me the error above.

I think it does not like that I meshed the faces, but it sounds strange for me that this cannot be possible, therefore I think I missed some steps in my workflow or I made some mistakes.

Thanks for any help you can provide me.

Fabio

Fabio88 · August 24, 2015, 08:52

Sorry to update this thread but I still did not solve this problem.

Thanks for any help you can provide me.

obscureed · September 27, 2017, 05:17

This might be too late for you, Fabio, but for the record:

I have seen the error in Fluent Meshing "Error: Prism Meshing is not supported for face zones of objects." -- but this was when I tried to add prisms to an existing volume mesh. This is a valid (and useful!) feature of Fluent Meshing, but for some reason it is incompatible with mesh objects. The answer here is to save a copy of the .msh (as always), then right-click on the object in the tree and delete the object *only* (keeping the faces etc). Then you can add prisms, morphing the existing mesh inwards.

As for the workflow that Fabio mentioned, where prisms are specified during volume-meshing in Automesh: it should work. (It helps if you have specified the boundary types of all face zones, so you can use the default scoping of prism layers on wall zones only.) It sounds possible that Fabio had created a mesh already, and then Fluent Meshing objected to adding prisms layers where there was already a mesh. In this case, the answer would be to delete the previous volume mesh (in Mesh...Manage) before Mesh...Automesh.

Fabio88 · October 4, 2017, 05:36

Hi Obscured,

never to late and thanks for your reply!

About my previous mesh error, I was not applying the prism layer to a volume mesh, but as you said, I was applying them to the faces of an object directly in the boundary layer mesh window (pushing the button create).
If I delete the object and create the boundary layer on the unreferenced faces, it works. Thanks!

What I previously did is:
- select the faces where I wanted to apply the bl in boundary layer mesh window and chose the settings
- push apply in the zone specific growth window
- push apply in the main window of the boundary layer window
- closed this window and push the button mesh in the automesh window

This workflow worked

Thanks again for your suggestion about the object deleting, I did not know this other procedure which indeed makes sense.

Cheers,

Fabio

Fabio88 · April 28, 2020, 06:18

Quick update.
You receive this error also when you set (by mistake) two prism layers growing from the same face.

For example I have control-1 acting on all the walls of my domain and control-2 acting on the ground, which is also a wall face.
Then Fluent gives the error "is trying to reset settings applied on zones. Please fix this problem before proceeding". Just have only one prism layer growing from a face.

August 12, 2015, 05:28	Fluent mesh: prism layer error	#1
Fabio88 Member Fabio Malizia Join Date: May 2010 Location: Leuven (Belgium) Posts: 51 Rep Power: 15	Hi all, I receive the following error when I try to create prisms in fluent mesh: Prism Meshing is not supported for face zones of mesh objects Below the procedure I applied in fluent meshing: - Create geometry in cad - import cad as mesh object and correct free nodes - create size function for the surfaces of the body - remesh it - create boundary box using the construction size tool (as well as BOI, for which I un-ticked the option create object) and material point - wrap my objects (not the box) - group the 3 objects and the external box in one object called total - when I go to auto mesh select the prism layer I want, fluent give me the error above. I think it does not like that I meshed the faces, but it sounds strange for me that this cannot be possible, therefore I think I missed some steps in my workflow or I made some mistakes. Thanks for any help you can provide me. Fabio

September 27, 2017, 05:17		#3
obscureed Senior Member Join Date: Sep 2017 Posts: 246 Rep Power: 11	This might be too late for you, Fabio, but for the record: I have seen the error in Fluent Meshing "Error: Prism Meshing is not supported for face zones of objects." -- but this was when I tried to add prisms to an existing volume mesh. This is a valid (and useful!) feature of Fluent Meshing, but for some reason it is incompatible with mesh objects. The answer here is to save a copy of the .msh (as always), then right-click on the object in the tree and delete the object only (keeping the faces etc). Then you can add prisms, morphing the existing mesh inwards. As for the workflow that Fabio mentioned, where prisms are specified during volume-meshing in Automesh: it should work. (It helps if you have specified the boundary types of all face zones, so you can use the default scoping of prism layers on wall zones only.) It sounds possible that Fabio had created a mesh already, and then Fluent Meshing objected to adding prisms layers where there was already a mesh. In this case, the answer would be to delete the previous volume mesh (in Mesh...Manage) before Mesh...Automesh. Fabio88 and CFDger like this.

October 4, 2017, 05:36		#4
Fabio88 Member Fabio Malizia Join Date: May 2010 Location: Leuven (Belgium) Posts: 51 Rep Power: 15	Hi Obscured, never to late and thanks for your reply! About my previous mesh error, I was not applying the prism layer to a volume mesh, but as you said, I was applying them to the faces of an object directly in the boundary layer mesh window (pushing the button create). If I delete the object and create the boundary layer on the unreferenced faces, it works. Thanks! What I previously did is: - select the faces where I wanted to apply the bl in boundary layer mesh window and chose the settings - push apply in the zone specific growth window - push apply in the main window of the boundary layer window - closed this window and push the button mesh in the automesh window This workflow worked Thanks again for your suggestion about the object deleting, I did not know this other procedure which indeed makes sense. Cheers, Fabio CFDger and maxzhou like this.

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August 24, 2015, 08:52		#2
Fabio88 Member Fabio Malizia Join Date: May 2010 Location: Leuven (Belgium) Posts: 51 Rep Power: 15	Sorry to update this thread but I still did not solve this problem. Thanks for any help you can provide me.

April 28, 2020, 06:18		#5
Fabio88 Member Fabio Malizia Join Date: May 2010 Location: Leuven (Belgium) Posts: 51 Rep Power: 15	Quick update. You receive this error also when you set (by mistake) two prism layers growing from the same face. For example I have control-1 acting on all the walls of my domain and control-2 acting on the ground, which is also a wall face. Then Fluent gives the error "is trying to reset settings applied on zones. Please fix this problem before proceeding". Just have only one prism layer growing from a face.