Learning Forum

[Tharathep1234]

Dear All,

I would like to refine a mesh with adaptive gradient function. I registered a mesh as shown in figure. Am I correct.

Thank you

[Kalyan Goparaju]

Hello, 

If you use the setting "Cells in Range" instead of "Min/Max Value Cells", you will get the option to specify "Gradient-Min" and "Gradient-Max" values. Specifying these values should help you refine the mesh where there are gradient changes. 

Thanks, 

Kalyan

[Karthik Remella]

Hello,

Yes, you should be able to create an adaption criterion based on the mathematical condition you are interested in. If necessary, you should be able to change from 'Min/Max Value Cells' to 'Cells in Range' and provide a certain range of values. 

You should then be able to create the necessary refinement based on this register.

Thanks.

[Tharathep1234]

Tutorials said that " Enter 1.92e-5 for Refine threshold ". Therefor, I have to enter 1.92e-5 in " Gradient-Max " Is it right

Thank you

[Karthik Remella]

Which tutorial is this?

[Tharathep1234]

[Karthik Remella]

Yes, that is how you would be setting your register. Please visually inspect the register after creating it just to make sure.

[Tharathep1234]

Thank you for your suggestion

[Karthik Remella]

If this worked, please mark the most appropriate response as 'Is Solution'. This will help others who might have a similar question on this community.

Thanks.

[Mohamed_Wael_Badawy]

Using mesh adaption significantly slows my model (Laminar-VOF), sometimes slower than using the fine mesh over the whole domain. Why is this happening?nThanksn

[Rob]

If the model is run in parallel you'll be overloading one cpu, so need to use load balancing. n

[Mohamed_Wael_Badawy]

Thanks for your reply. Are there any recommended settings for load balancing in case of adaptive mesh for VOF laminar model. I have been reading through the user guide but there are a lot of different partitioning options and settings, nothing was directly recommended.nn

[Rob]

I'd balance on cell count and model: the default method is Metis but you're aiming to balance the cells per node AND keep the partition boundary cells to a minimum. Adding in VOF means the solver will also account for the free surface in the balancing. n