Learning Forum

[stefan.kuenzli]

Hello

I did not find anything in the documentation. Is there a maximal viscosity that can be defined for a fluid in Discovery Live?

 

Best regards

[Subashni Ravichandran]

Hello skuenzli

Clicking on the Material icon in the Solution panel will show a list of materials.

Here you can simply select the fluid and edit the viscosity as required.  

 

[stefan.kuenzli]

Hi

 

Thank you for the information. But from the solver side there is no limitation regarding the viscosity?

 

Best regards

Stefan

[Subashni Ravichandran]

Hello  skuenzli

I'm not sure I really understand your query. Is there any particular analysis you are trying to perform where you are encountering an issue with viscosity? Could you please elaborate by maybe, giving us an example of the issue?

[stefan.kuenzli]

Hi

 

Thank you very much for your fast reply.

I wanted to calculate the flow in a die for polymer extrusion. (I am aware that there is a special module for that in AIM and that you should include the viscosity - shear rate dependance). This requires high viscosity values >10'000 Pa s. When I tried it a few months back I always got an error specifing high viscosities in the material data base. Now it seems to work. I think it was a GUI issue. Therefore, I was not sure whether Discovery can give meaningful results. Of course I can do a comparison by myself. But I thought maybe there is a known limit?

 

Best regards

Stefan

[Subashni Ravichandran]

Hello skuenzli

I have consulted my team to find out if there is any cap on the maximum viscosity that can be assigned in Discovery Live. 

I'm yet to receive a response. I will keep you updated on this.

[Subashni Ravichandran]

Hello skuenzli

Sorry for the delay in response. I heard back from my team and this is what they had to say.

High viscosity would not be a problem but simulations with low Reynolds number is not recommended as it could bring in other physical effects that DL does not capture fro now.