I was up to a similar thing and found some kind of a workaround:
You can export for example the Velocity field with Ansys post-processor as .csv file.
But to import it in UE you’ve got to manipulate it first because UE can just import .fga files (I think there’s an entry about this on https://docs.unrealengine.com .
So you want to have a .fga file which you can achieve by simply renaming from File.csv to File.txt and then File.fga .
BUT it’s still not that simple. The .fga data needs a header which consists of this: Number of nodes in x-y and z-direction respectively, spatial extension of the desired vectorfield.
If you want/still are interested in this topic I can send you some sample files, which will help hopefully 