Am 16.09.2014 16:24, schrieb Thomas de Groot:
> Well, I am interested in modelling wind patterns over a reed field, or a
> corn field. What I seem to observe are turbulent wave patterns moving
> the stalks back and forward while going over the field.

Looks quite promising for a start.

> suggestions are more than welcome of course.

Sure.

It seems to me that you're bending any given reed with a constant radius 
along the whole length of the stalk; I suspect that the stalk should 
bend most strongly at the base, because of (a) the wind acting not only 
on the tip of the stalk, but also on lower portions, so that the wind 
force affecting the bending of any given point increases downward along 
the stalk, (b) the stalk acting as a lever, further amplifying the 
bending force exerted on any given point on the stalk based on how far 
it is from the tip, and (c) the wind force acting upon a near-vertical 
portion of the stalk being stronger than that acting upon a 
near-horizontal portion.

The reeds should bend in a single direction only (albeit at different 
amplitudes) - the primary direction of the wind.

As for the waves, I guess they are not from turbulences already present 
in the wind, but rather from upright reeds "shadowing" those further 
downwind causing them to rise again, while themselves being exposed to 
the wind and beginning to move downward; this effect might be initiated 
and amplified by the individual reeds also resonating in the wind due to 
(c).

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