[ANSYS Meshing] Inlfation not working when using 'Patch Conforming' method

arhabib · September 13, 2013, 19:33

Hi;

I am creating a CFD mesh and the inflation option does not work at all when using 'Patch Conforming'.
I have tried any combination of settings but still activating or de-activating
inflation has absolutely no effect on the resulting mesh. No error messages are displayed at all!

When switched to 'Patch Independent', inflation appears but an error message shows up: 'The mesh on the following entities might be valid but too coarse.' And no entity is listed!

The geometry is a thin 3D domain.
Has anyone else had a similar problem?

Thanks

jrunsten · September 16, 2013, 04:50

Should work, if you set it up correctly. Meshing isn't always easy and automatic, regardless of software...

Can you share the geometry? If it's a thin geometry then maybe your settings for inflation are invalid - ie your inflation layers doesn't fit within the thin structure

arhabib · September 16, 2013, 12:39

Thanks for your response Josef;

I am modeling an open channel flow. I'd like to simulate part of the flume in the presence of an obstacle (block) which is located at x=0.19 m.
The dimensions of the domain in different directions are:
x: 3 m, y: 0.5 m, z: 0.045 m
The obstacle is 0.038 tall (in the y direction) and 0.0225 m wide (in the z direction).
Inflation is applied to the bed (3 m x 0.045 m) and all surfaces of the obstacle.
The two sides of the domain (x-y planes) are symmetry planes.
Here is a close-up image of the domain:

arhabib · September 16, 2013, 18:27

I should also mention that the inflation is shown in 'Preview Inflation'.
But in 'Preview Surface Mesh' or when mesh is generated, no inflation exists!

siw · September 19, 2013, 09:30

ANSYS Meshing does not make the prisms until after it has made the surface mesh when using the Patch Conformal method, so that is why you only see a surface mesh when you select "Preview Surface Mesh".

Have you changed any of the inflation layer options from their defaults, are you using pre or post inflation? Are you getting any warning or error messages? Have you made the inflation layers so small you just cannot see them? Try making the entire volume mesh and view a mesh metric to see want element types it reports.

Vidyanand Kesti · September 20, 2013, 09:02

It should work if you see in the volume mesh,please check the inflation values,if its quite easy you can go with edge bias also

September 13, 2013, 19:33	Inlfation not working when using 'Patch Conforming' method	#1
arhabib New Member Ali Habibzadeh Join Date: Apr 2009 Location: Vancouver, Canada Posts: 15 Rep Power: 17	Hi; I am creating a CFD mesh and the inflation option does not work at all when using 'Patch Conforming'. I have tried any combination of settings but still activating or de-activating inflation has absolutely no effect on the resulting mesh. No error messages are displayed at all! When switched to 'Patch Independent', inflation appears but an error message shows up: 'The mesh on the following entities might be valid but too coarse.' And no entity is listed! The geometry is a thin 3D domain. Has anyone else had a similar problem? Thanks

September 16, 2013, 04:50		#2
jrunsten Senior Member Josef Runsten Join Date: Jul 2010 Location: Gothenburg, Sweden Posts: 188 Rep Power: 24	Should work, if you set it up correctly. Meshing isn't always easy and automatic, regardless of software... Can you share the geometry? If it's a thin geometry then maybe your settings for inflation are invalid - ie your inflation layers doesn't fit within the thin structure sircorp likes this.

September 16, 2013, 12:39		#3
arhabib New Member Ali Habibzadeh Join Date: Apr 2009 Location: Vancouver, Canada Posts: 15 Rep Power: 17	Thanks for your response Josef; I am modeling an open channel flow. I'd like to simulate part of the flume in the presence of an obstacle (block) which is located at x=0.19 m. The dimensions of the domain in different directions are: x: 3 m, y: 0.5 m, z: 0.045 m The obstacle is 0.038 tall (in the y direction) and 0.0225 m wide (in the z direction). Inflation is applied to the bed (3 m x 0.045 m) and all surfaces of the obstacle. The two sides of the domain (x-y planes) are symmetry planes. Here is a close-up image of the domain: Last edited by arhabib; September 16, 2013 at 14:24.

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September 16, 2013, 18:27		#4
arhabib New Member Ali Habibzadeh Join Date: Apr 2009 Location: Vancouver, Canada Posts: 15 Rep Power: 17	I should also mention that the inflation is shown in 'Preview Inflation'. But in 'Preview Surface Mesh' or when mesh is generated, no inflation exists!

September 19, 2013, 09:30		#5
siw Senior Member Stuart Join Date: Jul 2009 Location: Portsmouth, England Posts: 739 Rep Power: 26	ANSYS Meshing does not make the prisms until after it has made the surface mesh when using the Patch Conformal method, so that is why you only see a surface mesh when you select "Preview Surface Mesh". Have you changed any of the inflation layer options from their defaults, are you using pre or post inflation? Are you getting any warning or error messages? Have you made the inflation layers so small you just cannot see them? Try making the entire volume mesh and view a mesh metric to see want element types it reports.

September 20, 2013, 09:02		#6
Vidyanand Kesti Member vidyanand Join Date: Nov 2011 Location: bangalore,india Posts: 66 Rep Power: 17	It should work if you see in the volume mesh,please check the inflation values,if its quite easy you can go with edge bias also