How do you think CFX-Build?
CFX-Build almost kill me the desire to be an engineer. I tried to build a drill hole with stell case in it. The hole is 1000m long and the diameter is 9''. In order to save computer resource, I tried to build a cylinder then cut it into quaters. But I got error message when I try to mesh it. Anybody know better mthod to build a model.
Thanks! |
Re: How do you think CFX-Build?
Hi David,
What error message did you get? Glenn |
Re: How do you think CFX-Build?
Hi, Glenn,
Thank you for your prompt response. The error message is as follows: Error: ------ Problem: Topology error detected in CAD model. CAD edge referenced 4 times by faces. Result: Model invalid for meshing. Cause: Invalid model. Action: Please refer to the user documentation "Using CFX-Build, Section 5 Meshing" for topological limitations, and modify the model accordingly. Solid 3.3.3 Thanks |
Re: How do you think CFX-Build?
You have big diference in dimensions (1000m to 9"). Try to use hexa cells in some other mesh package or in CFX-Build if it is possible.
REgards, gg |
Re: How do you think CFX-Build?
Hi David,
As gg said, your hole is very long and thin so the default tetrahedral mesh will not be very good. You should create a hexahedral mesh of the geometry - if you are using CFX 5.6 you can switch that on by changing the meshing mode. It is covered by the documentation. If you are still on CFX 5.5.1, it is a lot tricker but still possible to make a hexahedral mesh. There have been postings about doing this on this forum previously. Glenn |
Re: How do you think CFX-Build?
Hi David!, you have to separate the case in diferents sections (1000m is too large!), at the same time you need to locate de hole in a ring which belong to the tube. I had the same trouble !.
Take Care Carola |
Re: How do you think CFX-Build?
I really appreciate your help.
I tried to use Patran (in CFX 5.6) to descretize the geometry. Finally I got four domains in the problem. This time errors comed up in Solver. It says: </n> ERROR #004100018 has occurred in subroutine INMES. | Fatal overflow in linear solver. </n> I know the aspect ratio for the element is 0.05/10=0.005. Can anybody tell me whether large aspect ratio cause overflow? Thanks! David |
Re: How do you think CFX-Build?
Not likely, as this is not that large an aspect ratio. Check your boundary conditions and verify that the mesh is in the right units (check dimensions in Post).
Robin |
Re: How do you think CFX-Build?
Hi,Carola,
Thank you! Did you mean that I can divide the whole geometry along the center of the drill hole into several sections, for example, every 100 m/section. Regards! David |
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