Transient mesh refinement for heat equation

[PierreAntonetti]

Hi,

I can't find any example which handle a thermal simulation with amr time-stepping strategy.
When activating the amr, the vtu meshes (generated using ResultOutputs solver) do not contains the adapted mesh (only the original). How to make the adapted mesh be the current mesh ?

Thanks.

[kevinarden]

16.3 Keywords related to the adaptive solution

Adaptive Save Mesh = Logical True

https://www.nic.funet.fi/pub/sci/physic ... Manual.pdf

[PierreAntonetti]

Hi Kevin,

Thanks for helping. I already tried that in the Solver HeatSolve section :

Code: Select all

!Adaptive Mesh Refinement = True
Adaptive Remesh = False ! cause the mesh is generated with gmsh, so need to use the RGB alogorith
Adaptive Save Mesh = True

with the following in the Simulation section :

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Simulation Type = Transient
Steady State Max Iterations = 5

Unfortunately I didn't see the mesh changing.

I have the same problem when using the Timestepping mode :

Code: Select all

Adaptative Timestepping = Logical True
Adaptative Time Error = Real 1.0e-3
Adaptative Min Timestep = Real 0.1
Adaptative Max Timestep = Real 120

I'd like to get a coupling adaptative mesh refinement and timestepping strategies.

Thanks.

[Rich_B]

Hello,

To get specific advice, it usually helps to post a working example, with sif file, geometry file, and how to generate the mesh. For gmsh, add the *.msh file, or add the *.geo file with meshing instructions. Compress the files into an archive and attach to your post. The forum allows up to 3 attachments per post, up to 1 MB per attachment.

Rich.

[PierreAntonetti]

Hi Rich,

Sorry, i'm new in this forum

Here the attached zip file. The mesh was generated with gmsh and converted with "ElmerGrid 14 2" and apply ViewFactors

Thanks

[Rich_B]

Hello Pierre,

Attached is an archive with two modified sif files, one without AMR, the other with AMR.

Hope this helps.

Rich.

Edit: the two sif files are for steady state solutions.

[Rich_B]

and here are three screenshots, showing auto refinement steps zero, one, and then step ten.

Rich.

refine0.png (27.6 KiB) Viewed 572 times

refine1.png (28.76 KiB) Viewed 572 times

refine10.png (46.66 KiB) Viewed 572 times

[Rich_B]

Hello,

Attached are two sif files that use the original mesh files. These two sif files are transient solutions, one without amr, the other with amr.

Rich.