Learning Forum

[PeterBeshay]

I wish anyone can help me in this issue, I am simulating oil-water flow in a pipelines, mainly stratified wavy, i tried dynamic mesh adaption at the interface, however, the mesh does not update every time step. can anyone tell me how to fix?

[Rob]

It may not update every step as the free surface shouldn't change that much between the steps: is it updating at all?

[PeterBeshay]

Thank you so much for your response, Sir.

Actually now it is updating every time step, but after the interface leaves the refined region, the mesh stays refined, it does not coarsen to the original size.

In other words, the refined region is not following the water-oil interface.

 

[DrAmine]

Are you using dynamic mesh adaption? Can you post screenshot of the panel?

[PeterBeshay]

Dear Mr Amine, 

Thank you so much for your response.

After setting the models, boundary conditions and everything, i initialize the case, then patch oil on top of water in the pipeline. then i adapt as shown in the attached photo

But after few time steps i stop the solution, i see the refined mesh does not get coarse again after the interface leaves this area. 

Please help me in this issue. Thank you

[PeterBeshay]

also after solving this issue, i will be running cases on HPC, i'll submit jobs and run on parallel processes. any other considerations should be taken for dynamic mesh adaption? cause i read something about an executable command

[Rob]

Go into the Adapt manage options and increase the number of levels of refinement: the default is two to prevent accidental creation of massive cell counts. However, when you run the dynamic tool it'll sometimes adapt twice and then can't select the same cells to coarsen. 

[Rob]

Run the model (or a small test) locally to check all settings before using the cluster. 

[PeterBeshay]

Dear Mr rwoolhou, Mr Amine,

Thank you so much for your responses.

I did manage to solve the issue, Its all about adjusting the coarsening and refining thresholds. 

Thank you so much