Learning Forum

[gowthamdada]

while running dynamic mesh simulation i got this error?

   i can see the preview mesh motion at more time steps like 0.001s (30time step) but while running calculation it will not go after 10th time step. What will be the error?

 VOF method

[Keyur Kanade]

Hello,

What is mesh quality before you start your simulation? Please check quality in Fluent. 

What are your dynamic mesh settings? Which models you are using?

If possible, insert some images as well to explain problem in detail. 

Regards,

Keyur

[gowthamdada]

[Keyur Kanade]

Hi, 

Mesh quality looks ok. 

Is it hex mesh?

Can insert image of mesh scale info in remeshing panel? 

Are you using any udf?

Please check following video which may help you. 

Regards,

Keyur

https://www.youtube.com/watch?v=ei6-k1pysyQ

[gowthamdada]

using 6-dof udf, mass, ixx, iyy, izz, zero trans x -true, other all false.

 

[Keyur Kanade]

Hi, 

In Remeshing, please use min length scale as 0.0001 and max len scale as 0.015.

In smothing, please use 100 iteraions and use All for elements. 

Why do you have separate cell zones? 
If this does not solve your issue, then we will need to see dynamic mesh zones. 

Regards,

Keyur

 

[gowthamdada]

Again below error came. but now i can simulate at second time step.

WARNING: 1227 cells with non-positive volume detected.

Error at host: Update-Dynamic-Mesh failed. Negative cell volume detected

Error at Node 0: Update-Dynamic-Mesh failed. Negative cell volume detected.

Error at Node 1: Update-Dynamic-Mesh failed. Negative cell volume detected.

 

Error: Update-Dynamic-Mesh failed. Negative cell volume detected.

Error Object: #f

 

"Why do you have separate cell zones?"   i don't aware of this. mesh file send by senior 

 

 

 

[Keyur Kanade]

Hi, 

Can you please insert image of your dynamic mesh zone settings. 

Thanks!

Regards,

Keyur

[gowthamdada]

[Keyur Kanade]

It looks ok. What is symmetry zone?

Is it 2d o r3d?

 

[gowthamdada]

2d only.

blue one - symmetry outer domain

red one - symmetry inner domain

[Keyur Kanade]

Sorry its not clear to me about symmetry zones. Please explain your boundary zone names and their position in detail. 

Also which models you are using?

 

[gowthamdada]

here i attach my file. please find that

[Keyur Kanade]

Hello, 

As ANSYS employee, we can not download attachments. So please explain with inserting images. I know it will take some time, but we have to go with legal directions given to us. 

Best practices to fully leverage the ANSYS Academic Community:

 

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Thank you for your patience.

Regards,

Keyur