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can any one tell me how to create flapping motion in 2D ??

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Old   March 9, 2012, 05:44
Default can any one tell me how to create flapping motion in 2D ??
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can any one tell me how to create flapping motion in 2D ??



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Old   March 10, 2012, 04:02
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Should be the same like in 3D, but you need to make sure, your motion is compatible to the 2D model (e.g. all translations within the 2D plane, all rotations perpendicular to it).
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Old   March 11, 2012, 04:49
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i could morph the mesh, but i have no idea how to create the oscillating motion.


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Old   March 12, 2012, 04:04
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Either put a field function with a sin(t) or cos(t) function for the (total) displacement or grid velocity. Or put a time dependent table.
You also might read in the table and interpolate the table in a field function. There is a function for repeating motions to repeat the table for every cycle, so you don't need to put the same stuff several times to the table when you want to run for several cycles.
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Old   March 20, 2012, 01:11
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Thanks for the reply Mr.Abdul


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Old   March 20, 2012, 13:31
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In v702 you could use the overset method then you just have to move the overset region around.
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Old   March 21, 2012, 07:19
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Right, overset meshes is also an option for this kind of simulation. It might even be the better one, but the issue how to define the motion stays pretty much the same.
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Old   March 26, 2012, 00:47
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I couldnt still resolve the problem of defining the motion
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Old   March 27, 2012, 04:31
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Tools > Motions > New Motion (Select type)
for flapping motion I suppose that rotation is what you want.

then in your region, you can specify your motion under Physics Values.

Overset meshes are definitely the way forward here, but you must make sure that the overset mesh only overlaps fluid cells throughout the entire range of flapping as per the best practise guidelines.

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