dynamic mesh simulation

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  • Last Post 29 October 2018
gowthamdada posted this 26 October 2018

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

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kkanade posted this 29 October 2018

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. 

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Regards,

Keyur

 

gowthamdada posted this 26 October 2018

here i attach my file. please find that

Attached Files

kkanade posted this 26 October 2018

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 posted this 26 October 2018

2d only.

blue one - symmetry outer domain

red one - symmetry inner domain

kkanade posted this 26 October 2018

It looks ok. What is symmetry zone?

Is it 2d o r3d?

 

gowthamdada posted this 26 October 2018

kkanade posted this 26 October 2018

Hi, 

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

Thanks!

Regards,

Keyur

gowthamdada posted this 26 October 2018

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 

 

 

 

kkanade posted this 26 October 2018

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 posted this 26 October 2018

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

 

kkanade posted this 26 October 2018

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

gowthamdada posted this 26 October 2018

kkanade posted this 26 October 2018

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

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