Fluent Meshing for CFX opinions

siw · April 25, 2022, 04:47

I'm posting this in the CFX board instead on the Ansys Geom/Mesh board as it's for comments from CFX Users.

Read this PADT blog article (https://www.padtinc.com/2021/05/11/c...s-meshing-cfd/) and it got me thinking as a long time CFX and Ansys Meshing User.

Assumption: geometries are too complex to be split up into sweepable blocks (as I have) and make multiblock structured meshes. So, does anyone use Fluent Meshing for their CFX mesh generation, with the Hex-Core method (with the transition between octree level option)? Or do most CFX Users stay with Ansys Meshing with tetra-prism meshes? Unfortunately, the poly-hexcore meshes are invalid with CFX, which would be the best (IMO) non-multiblock, unstructured method.

I would like to 'jump ship' from CFX to Fluent, mostly on the basis of using the poly-hexcore meshes for my complex internal flow geometries, for higher mesh quality and reduced node/element quantities. Ans Ansys is putting more development into Fluent over CFX - just see the release highlights documents. Yet, Fluent lacks some features that CFX has, and then needs UDFs. And I find the CFX file management easier, as I try to run in Standalone mode as much as possible. However, Fluent does have a larger range of boundary conditions, which is useful in some instances.

I've mostly ignored ICEM tetra-prism over the years (Ansys are putting ICEM out to pasture) and I have never really tried SpaceClaim Interactive Meshing (the lack of Ansys tutorials etc. make me doubt how serious they are pushing SCIM).

Gert-Jan · April 25, 2022, 07:55

I only use fluent if my customer asks me to. Or if physics are only available in Fluent, e.g. a wavy ocean with a ship, or where I consider the modelling features better, like VOF and surface tension.

I never touched fluent meshing. Mostly, I use the ANSYS meshing. If surfaces of the 3D model are really crap such that even spaceclaim doesn't eat them (e.g. a ship hull from Rhino) I use ICEM.

April 25, 2022, 04:47	Fluent Meshing for CFX opinions	#1
siw Senior Member Stuart Join Date: Jul 2009 Location: Portsmouth, England Posts: 742 Rep Power: 26	I'm posting this in the CFX board instead on the Ansys Geom/Mesh board as it's for comments from CFX Users. Read this PADT blog article (https://www.padtinc.com/2021/05/11/c...s-meshing-cfd/) and it got me thinking as a long time CFX and Ansys Meshing User. Assumption: geometries are too complex to be split up into sweepable blocks (as I have) and make multiblock structured meshes. So, does anyone use Fluent Meshing for their CFX mesh generation, with the Hex-Core method (with the transition between octree level option)? Or do most CFX Users stay with Ansys Meshing with tetra-prism meshes? Unfortunately, the poly-hexcore meshes are invalid with CFX, which would be the best (IMO) non-multiblock, unstructured method. I would like to 'jump ship' from CFX to Fluent, mostly on the basis of using the poly-hexcore meshes for my complex internal flow geometries, for higher mesh quality and reduced node/element quantities. Ans Ansys is putting more development into Fluent over CFX - just see the release highlights documents. Yet, Fluent lacks some features that CFX has, and then needs UDFs. And I find the CFX file management easier, as I try to run in Standalone mode as much as possible. However, Fluent does have a larger range of boundary conditions, which is useful in some instances. I've mostly ignored ICEM tetra-prism over the years (Ansys are putting ICEM out to pasture) and I have never really tried SpaceClaim Interactive Meshing (the lack of Ansys tutorials etc. make me doubt how serious they are pushing SCIM).

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April 25, 2022, 07:55		#2
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,928 Rep Power: 28	I only use fluent if my customer asks me to. Or if physics are only available in Fluent, e.g. a wavy ocean with a ship, or where I consider the modelling features better, like VOF and surface tension. I never touched fluent meshing. Mostly, I use the ANSYS meshing. If surfaces of the 3D model are really crap such that even spaceclaim doesn't eat them (e.g. a ship hull from Rhino) I use ICEM.