There are two things that cause trouble on the simulation side of things, the resolution of the terrain object, and the matching the scale.
I suspect that for RealFlow these aren't as big a problem as they are for Blender.

If you're having a problem with OBJ files from Blender (as opposed to BOBJ files, which can't be read in Vue due to the gzip module still being borked) then it shouldn't be too difficult to fix for my script (Mark's uses Vue's own importer) but it's probably down to using the right export options.