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[ANSYS Meshing] Meshing problems

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Old   April 7, 2014, 21:08
Default Meshing problems
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Alexander
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Hello everyone. Sorry for a bad english, but i try to explain my problem.

I am meshing journal bearing with oil inlet, and all of my attemps unsuccessful.
I had to slice the geometry because of poor mesh quality.
1-thin film
2-inlet pipe
and now i have a problem with connection of 2 fluid zones

I tryed recomendations from this thead but it doesn't help

http://www.cfd-online.com/Forums/flu...tml#post278469

Could you tell me what i should to do. Maybe i have missed something important.
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File Type: jpg 2.JPG (57.2 KB, 25 views)
File Type: jpg 4.JPG (21.5 KB, 20 views)
File Type: jpg 5.JPG (71.5 KB, 19 views)
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Last edited by i-torch; April 7, 2014 at 21:16. Reason: add pictures
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Old   April 9, 2014, 03:20
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Bharath kumar
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your problem description wasn't clear.

Please upload your case file if possible.
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Old   April 9, 2014, 04:32
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Praveen Kumar R
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Hi Aleaxander,

If I am not wrong, you have created two separate volume meshes for thin-film & inlet-pipe and trying to define a non-conformal interface between the two volume meshes/zones.

What is the problem you are facing in defining the non-conformal interface. Does Fluent gives some error message? Or you don't see fluid flowing from inlet pipe into thin film region?

Having said that, creating a single connected / conformal mesh is possible for your case, if you are using Multi-block approach.

Happy Learning!!!
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Old   April 9, 2014, 06:53
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Quote:
Originally Posted by bharath View Post
your problem description wasn't clear.

Please upload your case file if possible.
Case file

Quote:
Originally Posted by praveen@cfd-online.com View Post

What is the problem you are facing in defining the non-conformal interface. Does Fluent gives some error message? Or you don't see fluid flowing from inlet pipe into thin film region?
There is no any error message from fluent. I see it by the pathlines. Fluid doesn't flow from inlet into film region. Sometimes it look like in attach.
8.JPG

I have changed the geometry.
Mesh

Last edited by i-torch; April 9, 2014 at 08:50.
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Old   April 9, 2014, 08:53
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Praveen Kumar R
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Hi Aleaxander,

I examined the case file, the interface looks just fine.

When tried to run the case setup as it is, I observed a pathline similar to what you got. i.e., flow not going from inlet zone to film zone.

But I was not sure whether the issue is with interface or not. So, I tried running the case with velocity inlet (0.25 m/s randomly taken this value) and its working fine. Please see the attached picture.

As I said, the interface looks just fine. Please revisit pressure values at the boundaries....

All d best!!!

Happy Learning!!!
Praveen Kumar R
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Old   April 9, 2014, 11:27
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Quote:
Originally Posted by praveen@cfd-online.com View Post
But I was not sure whether the issue is with interface or not. So, I tried running the case with velocity inlet (0.25 m/s randomly taken this value) and its working fine. Please see the attached picture.
Thank you!!! I could not imagine what the problem is. Using velocity-inlet boundary instead pressure-inlet helps. It is interesting why this is happening.

I will try to improve my model so maybe there where any questions=)
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