To re-use existing 'sampleDict' files simply add the following entries: type sets; libs ("libsampling.so"); and run postProcess -func sampleDict It is probably better to also rename 'sampleDict' -> 'sample' and then run postProcess -func sampleDict
e.g. postProcess -func 'patchAverage(name=inlet,p)' postProcess -func 'patchIntegrate(name=inlet,p)'