[nishant.kumar]

Hello FOAMers,

I am using OpenFOAM v9.

I am trying to use the mapFieldsPar utility to map fields from a source case to a target case. The target domain is a subset of the source domain, with the bottom patch coinciding as shown in the sketch:

mpirun -n $cores mapFieldsPar -parallel \
    -mapMethod cellVolumeWeight \
    -sourceTime $startTime \
    $mapFieldsSource > log.mapFieldsPar 2>&1

I have the source case decomposed into 180 subdomains and want to run the target case with a lower number of subdomains (e.g. 24) given the small size of the computational domain.

I can't arrive at making this work as mapFieldsPar tries to match the number of subdomains in the target case with the numberOfSubdomains specification in the decomposeParDict of the source case and throws an error if they don't match. Is there a way to make this work?

PS: I tried the serial utility mapFields which seems to work with dissimilar decomposition of the source and target cases but it is extremely slow.