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HOW to Simulation LES , some doc for les model

This ones work with `eddyNekNek` on Summit Use temporary session file and put two meshes under separate folder. NVME is not used so we don't need to set OCCA_CACHE_DIR here,...

At some point, we had this available. This still exists inside `mesh_t`, but it is no longer allocated. We should either remove it, or allocate it as expected.

bug

**Describe the bug** With empty `UDF_ExecuteStep`, the `*0.f0*` files generated by NekRS using `writeControl` will have timesteps=0 in the header. Paraview will have issues when there are multiple files with...

correct an error in faceMap[6] at line 87

add favre averaging to avg plugin favre averaging is the density weighted averaging. it is widely used for variable density flows.

To run large local problem sizes nek5000 requires `mcmodel = medium` or `mcmodel = large` and `PIC`. However this combination is often not supported on AArch64 (e.g. GNU, Clang) or...