Hi all, I’m working with a dolfinx simulation in parallel (MPI), and I want to map the values of a function computed in a parallel mesh (PHI) to a serial version of the same mesh (e.g., loaded from an XDMF file in rank 0). I’m not sure how to do this properly, especially when it comes to matching de…

[image] Felix1: x = mesh_parallel.comm.gather(PHI.x.array, root=root) Here you are gathering both owned and ghosted entries, which would give different sums. See for instance: Parallel Computations with Dolfinx using MPI — MPI tutorial

How to correctly map function values between a parallel and a serial mesh

dolfinx

dokken June 2, 2025, 6:40am 2

See for instance: Gather solutions in parallel in FEniCSX - #9 by dokken

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How to correctly map function values between a parallel and a serial mesh

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