How to control block？

[Blackfoxdragon]

I encountered such a problem when solving the Contact issue.
I have a three-dimensional cylinder with a shell on its exterior, which creates a gap between the cylinder and the shell. The cylinder will expand due to heat, causing the gap to become smaller or even disappear.
Now, the problem is that after the expansion, in another solving process, this gap needs to be filled with material. However, obviously, in the previous Contact problem, there was no block in this gap. How can I identify this gap after the expansion and fill it with a block?
In other words, how can I make this gap area be one material or "void" depending on the different solving problems?
I noticed that Discussion #27583 might be somewhat similar, but my problem seems to be more complex.

[GiudGiud]

Hello

You could have two meshes. One for the first contact simulation where there are no elements in the gap, one where there are elements in the gap.
Then use a SolutionUserObject with the results from the first simulation, including the displacements, to fill the initial condition in the second simulation.

It is best if the mesh for the second simulation looks close to the final results of the first simulation.

Alternatively, you can use the output mesh for the first simulation, load it in a FileMeshGenerator, and use a general two-D or three-D region mesh generator to fill the gap with new elements.
In 2D
https://mooseframework.inl.gov/source/meshgenerators/XYDelaunayGenerator.html
OR
https://mooseframework.inl.gov/source/meshgenerators/FillBetweenSidesetsGenerator.html
in 3D
https://mooseframework.inl.gov/source/meshgenerators/XYZDelaunayGenerator.html

[Blackfoxdragon]

There is another problem that has been bothering me all the time.
Whenever I try to perform calculations using multi-nodes on the HPC, it always gets stuck at the situation shown in the illustration.
However, it works fine when using a single node.

[GiudGiud]

Whenever I try to perform calculations using multi-nodes on the HPC, it always gets stuck at the situation shown in the illustration.

which HPC is it?
Are you using the same MPI you used to compile and to run the code?

[Blackfoxdragon]

I submit computations using the SLURM job scheduling system，means i use srun instead mpirun

[GiudGiud]

what does srun use in the backend?
you ll likely need to ask your cluster administrators that question.

If srun is using their own custom-installed MPI, you need to be using this too for compiling