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-   -   I got a problem after I repaired and improved the quality of mesh in FLUENT (http://www.cfd-online.com/Forums/fluent/119054-i-got-problem-after-i-repaired-improved-quality-mesh-fluent.html)

phamhoanghuyphuocloi June 8, 2013 23:22

I got a problem after I repaired and improved the quality of mesh in FLUENT
 
1 Attachment(s)
Dear all,

I am using the realizable k-epsilon turbulence model in FLUENT to simulate the wind flow in the atmosphere through UDFs. Before I ran simulation, I had used "mesh/repair-improve/improve-quality". However I had an error message " Error: Divergence detected in AMG solver: epsilon
Error Object: #f "
Does anybody know how to solve it? Please tell me. Thank you.

sina.sh June 8, 2013 23:57

Dear Loi
Mesh repair in fluent is not good. you can use CFX for mesh adaption. its clear that a region in your domain has bad quality becuase after time elpasing when flow recive to specific region solver had been diverged.

Regards

phamhoanghuyphuocloi June 9, 2013 00:07

Dear Sina,

I am using FLuent. I did not try to use CFX yet. For repairing and adapting the quality of mesh in FLUENT, should we do that? Because I just start use CFD so I have rare experience. Please tell me. thank you.

sina.sh June 9, 2013 00:12

Why you want repair your mesh? Do you have any problem with your mesh? plz click on MESH on fluent toolbar then click on check mesh and send result for me.

phamhoanghuyphuocloi June 9, 2013 00:26

1 Attachment(s)
Dear Sina,

I got the status after I check mesh quality in Fluent. Please find the picture. thank you

sina.sh June 9, 2013 00:37

Its seem that your mesh quality have't any problem. you can use orthogonal meshing to avoide this error. but dont worry! run your case without any mesh repairing.

phamhoanghuyphuocloi June 9, 2013 00:48

Thanks Sina.

I will not use mesh/repair-improve/improve-quality in Fluent. Because my case can run and get result without repairing mesh. I got the problem after I repaired. So I though my mesh have mistakes. Thank you

MARIANA LOQUITA December 30, 2013 03:42

mesh problem
 
1 Attachment(s)
dear Loi and Sina,
i have the same problem as you did but my report from quality test was different. i am attaching you the photo. Can you help me? can you understand where is the problem?
thank you
and i hope that somebody will know the how to solve my problem

MARIANA LOQUITA December 30, 2013 03:45

mesh again
 
i run again my mesh in fluent and i had this message :
Divergence detected in AMG solver: x-momentum -> Increasing relaxation sweeps!

Error: Divergence detected in AMG solver: x-momentum
Error Object: #f
do you know what is it?

Zaktatir December 30, 2013 07:11

divergence starting from the impuls in x direction!

Check up settings and Boundaries

MARIANA LOQUITA December 30, 2013 07:19

x
 
thank you, i understood that too. should i do it in the geometry step? or in mesh? or is it the same?
thank you
best regards

Zaktatir December 30, 2013 07:24

You have zero minimum orthogonal quality and huge aspect ratios! Start improving the mesh and please do that in your mesher.

MARIANA LOQUITA January 2, 2014 12:13

mesher
 
hello and happy new year!
what do you mean repair mesh in your mesher????

MARIANA LOQUITA January 2, 2014 12:22

mesh quality
 
dear Zaktatir,
sorry that i am bothering again and again but i really do not understand where is my problem( i just start to learn fluent).
so i have to check boundaries in mesh step yeap? and which are the limits so i would know that my mesh is ok?
thank you very much

Zaktatir January 2, 2014 12:27

You have to deliver a better mesh. I don't know which program you are using to build up the numerical domain that's why i said pre-processing program. You geometry is not difficult to deliver a better meh

sina.sh January 8, 2014 04:07

Dear Mariana
what is your software for meshing?

MARIANA LOQUITA January 8, 2014 11:45

hello and happy new year!!!
 
I have ansys fluent 14.0. and i am working mesh there. in my pc i have windows 7. the geometry i made in rhino.

sina.sh January 11, 2014 01:38

Dear Mariana

Please try to use structural Mesh in ANSYS Meshing to avoid this error.
Regards
sina

MARIANA LOQUITA January 11, 2014 06:21

mesh
 
dear Sina,
i will try
thank you
br
mariana


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