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you can export the cell information, that should give you what you want to do. the isoline are derived from those values.
I did it. Nice and useful. I used the Mesh export for the wake field and wake factor computation of a real hull-propeller joint. It has been easy and simple to do (a little slow, due to the big ammount of cells, that have had to be exported in parts).
I exported a narrow mesh, wich envelopes the propeller disk (Radius=2.5m), asking for the axial speed component (V(Z) in my case). Resulted in 60410 cells (Averaged 14mm³ each). Once in Excel, after some work and by integration and comparison with the "open waters flow" I got the wake factor.
My most sincere thanks.
Thanks a lot, I'll give a try to it.