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[ANSYS Meshing] Meshing a long and narrow tube

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Old   June 26, 2014, 03:33
Default Meshing a long and narrow tube
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Zaid
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Hi

I'm new to CFD and I'm trying to mesh a tube geometry with a cross section of 500 square micrometres and a length of 30 cm.

I started with a tube of only 0.1cm length just to test the settings with and with the physics preference set to CFD and the automatic method, the mesh generated was quite nice:

http://i.imgur.com/YJ9cEMB.jpg

I then tried the full 30cm length tube using the same settings, but the mesh is much lower quality:

http://i.imgur.com/o6RJsy9.jpg

I have only a limited understanding of ANSYS of meshing techniques but I assumed that increasing the length of the model wouldn't reduce the quality so much.

I'd love to know which settings I need to change in order to get a mesh similar to that of the smaller length tube. If any more information is needed please let me know.

Thanks
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Old   December 7, 2016, 02:50
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Joyce
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Hi!
Have you solved this problem? I have the same one as your.
THX
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Old   December 7, 2016, 05:17
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Quote:
Originally Posted by Joyce View Post
Hi!
Have you solved this problem? I have the same one as your.
THX
What's the problem?
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Old   December 7, 2016, 18:31
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Zaid
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It's been a while but I believe I solved it by applying a sweep mesh as well as face sizing with an appropriate element size. In this case of it was 50 micro meters.
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Old   December 8, 2016, 02:08
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Hi, thanks for response.
I used the sweep method in ANSYS Meshing, and I can get the mesh like this:

Now I want to reduce the element number, that I increase the element size along the length direction, but the element quality reduced and it becomes too low to use.

So do you know how to deal with it? or should I change to use other meshing software like ICEM?
Thank you.
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Old   December 8, 2016, 12:16
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Define a sweep method on that body keep your element size as before (where you were getting a good mesh) and increase the number of sweep divisions to what you want. This will help your mesh quality.
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Old   December 8, 2016, 12:42
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Quote:
Originally Posted by Joyce View Post
Hi, thanks for response.
I used the sweep method in ANSYS Meshing, and I can get the mesh like this:

Now I want to reduce the element number, that I increase the element size along the length direction, but the element quality reduced and it becomes too low to use.

So do you know how to deal with it? or should I change to use other meshing software like ICEM?
Thank you.
What quality metric are you talking about?
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Old   December 8, 2016, 20:43
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Quote:
Originally Posted by Antanas View Post
What quality metric are you talking about?
I used the 'element quality'.
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Old   December 9, 2016, 00:30
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Quote:
Originally Posted by Joyce View Post
I used the 'element quality'.
Not relevant for CFD. You should check Aspect Ratio, Skewness, Ortho. Quality.
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