CFX vs. FLUENT
This topic never stops showing up in the forum. Let me help you make it clear.
1. By CFD Code
- Continuity, momentum and energy equations are solved sequentially.
- Conservative vector forms in time and space3. CFX is kind of unique
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Thanks for that.
So Fluent uses the FVM and CFX uses the FVM with Finite elements? I've heard it described that way. I also posted on whether this has anything to do with Fluent being able to handle 3D meshes but CFX not being able to? |
CFX and Fluent can both handle 3d meshes just fine.
You are probably getting confused with 2d meshes: Fluent has a pure 2D solver, but CFX does not have a 2d solver and you need to make a 1 element thick model and ignore the third dimension. This is messier to set up, much slower to solve and uses more memory. This was done simply because CFX did not want to do the development effort to make and validate a 2d solver, they thought the market was going to full 3d so a 2d solver was not worth the effort in their opinion. I have always disagreed with this logic and think this is one of CFX's greatest weaknesses. |
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In fact, if CFX converts a tet mesh in the background, it converts this into a polyhedra mesh. Therefore, a solution with a tet mesh in CFX is somewhat comparable to a solution with a polyhedra mesh in Fluent. Solutions with tet-meshes are uncomparable. So, what you see is that Fluent can read almost every mesh like hex, tets, pyramids, prisms, polyhedra and Hex meshes with hanging nodes (cutcell-technology). CFX can only handle hex, tet, pyramids, and prisms. It cannot read polyhedra and hex-meshes with hanging nodes, because CFX cannot convert them in its background process to a polyhedra mesh. |
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Otherwise, the description is spot on. |
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