pressure functionObject, pName is not read
The pressure functionObject does not read
p entry which represents
pName, although it is mentioned in the description of the class. The pressure field name is hardcoded and passed to
fieldExpression here. In order to have the right behaviour, the user can set the
pName, then the read function of
fieldExpression will overwrite the field name. I guess the easiest fix here is to update the description of the class and replace
field, but it isn't the most intuitive.