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#1 |
New Member
Join Date: Mar 2018
Posts: 14
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I am trying to conduct fluid analysis on a screw compressor.
The design is something like in this video. https://www.youtube.com/watch?v=Pu5YX_qIPVo The video employed a TwinMesh meshing software and CFX solver to efficiently run the analysis. Apparently, I do not have the TwinMesh Grid software, so I am stuck with ANSYS Meshing. How would one mesh something like this in ANSYS so it will work for CFX. I understand fluent has dynamic meshing, but what about CFX? |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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That simulation was likely done using immersed solids, not dynamic remeshing. There is a tutorial example of a screw compressor with immersed solids on the CFX tutorials (available from the ANSYS Customer webpage).
You can do this with dynamic remeshing. CFX supports this through an interface with ICEM. Again, examples are on the ANSYS Customer webpage.
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#3 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,816
Rep Power: 144 ![]() ![]() ![]() ![]() |
That simulation was likely done using immersed solids, not dynamic remeshing. There is a tutorial example of a screw compressor with immersed solids on the CFX tutorials (available from the ANSYS Customer webpage).
You can do this with dynamic remeshing. CFX supports this through an interface with ICEM. Again, examples are on the ANSYS Customer webpage.
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Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum. |
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#4 | |
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Join Date: Mar 2018
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Quote:
Regarding dynamic remeshing, my problem is a super charger where the screws are rotating and compressing the gas. Can I get by sliding mesh? or am I stuck with dynamic remeshing? |
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#5 |
Senior Member
Gert-Jan
Join Date: Oct 2012
Location: Europe
Posts: 1,885
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This is Twin Mesh. For sure.
With Twin Meshing tool from Berlin, you have to make a mesh for every degree of rotation and read these meshes in for each time step. So there is quite some meshing to be done for one rotation of the twin screw. And a lot of bookkeeping. :-) But at least you can get it done. Immersed solids is also a possibility but by far not as accurate as the twin mesh method. But if accuracy is not really necessary, you can get an idea of the flow using immersed solids. Not sure if you can combine it with compressible gas. But I think it will do. Forget Dynamic meshing for this application. Not suitable. Not even in Fluent. Your gap is way too small. Sliding meshing is completely out of the question, since there is no sliding interface. So, if you want this to be solved accurately, buy a license. Period. Or hire someone with a license. I don't sell it, nor have it. |
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#6 |
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Cemal
Join Date: Apr 2018
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did you solve this problem? How? I have same problem now.
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#7 |
New Member
Join Date: Mar 2018
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I did not. I lost the project, because I could not do it. If you come up with an answer, would appreciate sharing some tips
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#8 |
Senior Member
Gert-Jan
Join Date: Oct 2012
Location: Europe
Posts: 1,885
Rep Power: 27 ![]() |
Twin Mesh is the only succesfull solution I have seen so far.
Ánd I don't have it nor sell it. |
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Tags |
compressible, dynamic mesh, rotating bodies |
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