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-   -   can any one tell me how to create flapping motion in 2D ?? (https://www.cfd-online.com/Forums/star-ccm/98370-can-any-one-tell-me-how-create-flapping-motion-2d.html)

 sanjay March 9, 2012 05:44

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

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

regards
www.aerosapien.blogspot.com

 abdul099 March 10, 2012 04:02

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).

 sanjay March 11, 2012 04:49

i could morph the mesh, but i have no idea how to create the oscillating motion.

regards
www.aerosapien.blogspot.com

 abdul099 March 12, 2012 04:04

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.

 sanjay March 20, 2012 01:11

regards
www.aerosapien.blogspot.com

 frogotron March 20, 2012 13:31

In v702 you could use the overset method then you just have to move the overset region around.

 abdul099 March 21, 2012 07:19

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.

 sanjay March 26, 2012 00:47

I couldnt still resolve the problem of defining the motion:(

 DanHamilton March 27, 2012 04:31

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.

Regards
Dan

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