Adaptive Mesh in Multi Phase Flow Simulation Using Ansys Fluent

What is Adaptive Mesh?

In this video, on behalf of Alpha Omega team, 3D Dam break, a classical two-phase flow problem, was solved using the adaptive meshing technique in ANSYS Fluent. Mosaic meshing (Poly-hexcore) was used in ANSYS Fluent meshing to generate the mesh with the total number of 50,753 cells. The Volume-of-Fluid (VOF) method was implemented in ANSYS Fluent to simulate the two-phase (air-water) flow in a tank. In order to refine the mesh, only near the gas-liquid interface, the dynamic adaption mesh with maximum refinement level of 2 was applied. It is demonstrated that such dynamic adaptive mesh can successfully refine the mesh near the interface region and keep the coarse meshes elsewhere in the computational domain., which can be helpful to reduce the computational time.

Example: 3-D Dam Break
Mesh number: 50,753 cells
Mesh type: Mosaic meshing (Poly-hexcore)
Fluids: air and water
Multiphase method: VOF + Dynamic adaption mesh with maximum refinement level of 2
Mesher: ANSYS Fluent Meshing 2020R1
Solver: ANSYS Fluent 2020R1

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[behnoushrezaeian]

Nice simulation, and great job in providing step by step tutorial. Thanks for sharing

[prashantdubey]

Hello, sir, can you please tell me, why I'm not able to patch cells that I've marked, with (Volume fraction= 0) for air ?? I've tried a lot but my whole volume is showing air.

[sagarshrestha]

Hello, thanks for such an informative video, but I would like to request you to answer one question. What are the boundary conditions, PV-Coupling Scheme, and URF values that you have set for this calculation? You have not used the energy equation, is it necessary or not?

[janweggen]

Thanks for the really nice step-by-step explanation!! Could you please comment on two settings you did?
1.Why did you chose k-omega model? I would assume the flow is mainly laminar, or am I wrong?
2. Why did you chose explicit VOF formulation? From my experience the implicit formulation is much faster and also reliable. Thank you very much for your reply.

[binhtranvan]

Hi. I've tried to regenerate this simulation. However, my final animation doesn't have a smooth and fine water appearance like yours, it shows exactly the scene-1 iso-contour. May I miss any settings?

[I_am_Rathore]

Thank you very much for this step-by-step video tutorial on FLUENT, really helpful.

Also, can we perform the same in ANSYS 19.0 version?

[月照皇图]

Thank you, Sir. What is the difference between this method and PUMA?

[Mohamed.wael]

Thanks for this helpful tutorial. Does mesh adaption significantly slows your solution? This always happens to me when I try to simulate droplet motion.

[hamedmehrvlogs]

That's a great detailed tutorial. Love it!

How many mesh elements did you have? Please also share the details of your simulation machine and the simulation clock time. Thank you.

[markkeating]

AMR is not required in other 3D hydraulics VOF codes for such cases with maintained accuracy. Neither is the requirement to solve for the gas phase.

[madhukarrapaka]

Is the Adaptive mesh feature works for complicated VOF cases as well??

[denghongzhou]

Hello, thanks for this great video. Could you explain a little bit on how to apply adaptive mesh if Eulerian model is applied rather than VOF? I found the adaptive mesh button is grey when I selected the Eulerian model. But as you showed in this video, it works well with VOF. Thank you.

[drashar]

can we use adaptive meshing for species transport model for chemical reactions?

[ndibakarareddy]

How many hours did it take to complete for 2 seconds???

Mine is of 48 cores, still I approximated to 56 days from what numbers I got in the console. Total of 40, 000, 00 iterations and could complete only 56, 200 in 18 hours. I used the same dimensions roughly and mesh size.

I had to terminate after 18 hours. 56 days are so long!

Please tell me how much time your pc took for 2 seconds.

[Anurag-sqyc]

zone-surface: cannot create surface from sliding interface zone.
Creating empty surface.
Can I know why this happens

[Popocandy_]

if i would like the tank to rotate how am I suppose to set the condition, please? BTW thank you so much for this video!

[varanasisaisubhankar]

Can you please tell me how to use this feature in Ansys 18/19?

[mercurial]

can u describe boundary condition in detail ?

[xa]

is it compatible with fluid structure interaction ?

[Knowledgepoin]

Hello, Can you make a video on LES and DES models on similar concepts?