I think you look for a utility mapFields, see the directory utilities/preProcessing/mapFields. The utility is using dictionary mapFieldsDict, so look into tutorials for that file to figure out how to set it up.

You can use it to map your flow fields-U, p. You will have to come with your own idea about the phase marker...

Thanks Petr :)

I agree, you should use mapFiels. Try the different mapping option because sometimes they will give slight different results.

Regards

Franco