The OpenFOAM community has recently updated the utilities to write EnSight Case Gold format from the latest version (v1612) of OpenFOAM. Users of EnSight + OpenFOAM can leverage the enhancements to the export routine to improve their transfer of information from OpenFOAM into EnSight.
Of particular note is the ability to have OpenFOAM write EnSight case format files DURING the transient solver run (rather than waiting until the transient run is complete). In addition, enhancements to the generation of measured data (aka cloud data or Lagrangian particles) have been made.
The details of the updated export and write routine can be found here on the OpenFOAM website: