Does anyone understand how turbulence is modelled?

I've had the following experience: I've been soaring using the ASK-13 in a
test of the new convective cloud life cycle implementation (nothing is as
frustrating as a nice Cumulus dissolving just as you are about to reach
it...), and by a bug which I haven't quite understood yet, the effect
volume of the thermal was terminated incorrectly. I had all relevant
property browser windows open (it was a test after all), so by chance I
have a quite good idea what was happening.

Since thermals are surrounded by a zone of turbulence, I left the thermal
with turbulence 3 Hz magnitude 0.6 or so, with all thermal lift off (I can
confirm that also ridge lift was off). The ride was quite bumpy, but to my
surprise I was able to climb on turbulence alone about 300 m. Since the
ASK-13 would sink with a rate of 0.5 - 1 m/s in unmoving air, this means
that somehow turbulence must on average generate have a lot more airflow
from below than from above.

Can anyone else reproduce that? If yes, is this how it is supposed to be
or is that a bug?

* Thorsten


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