How to create a flapping motion on fluent?

- July 18, 2019 at 6:42 am
  
  Nishanth
  Subscriber
  
  I want to create a flapping motion for a wing on fluent. similar the link attached below, but not that complicated, I just want it to go up and down with the same angle of attack.
  
  https://www.ansys.com/blog/dragonfly-flapping-ansys/
  
  This is the model I have created, it has a enclosure and a rotating wall which contains the wing.
  
  The mesh has a max skewness of 0.89
  
  Lets say I want the wing to go from -60 degrees to +60 degrees, how do I do that?
  
  Should I do this with dynamic mesh or use mesh motion in cell zone conditions?
  
  I have never used UDF, can you please guide me from start on how to simulate the above mentioned motion?
- July 18, 2019 at 8:48 am
  
  Rob
  Ansys Employee
  
  If it's a simple rotation then you can use sliding mesh and rotate the cylindrical zone. The input is a rotation speed so you may need to use the expressions in 2019R2 to control the position/angle.
- July 18, 2019 at 8:57 am
  
  Nishanth
  Subscriber
  
  If it's a simple rotation then you can use sliding mesh and rotate the cylindrical zone. The input is a rotation speed so you may need to use the expressions in 2019R2 to control the position/angle.
  
  But when I give rotation It is going to rotate in one direction (clockwise or anticlockwise), I want it to go upto a certain angle and then it should start rotating in the other direction. Similar to a bird flapping!
- December 23, 2019 at 12:19 pm
  
  DucNguyen
  Subscriber
  
  dear Rwoolhou
  
  Where can I find this expresstions?
  
  I'm trying simulation the flapping wing. I set up the wing flap down. when it at the bottom, I stop caculate and change the direction of rotation and repeat
  
  sorry for my English
- December 23, 2019 at 3:43 pm
  
  Rob
  Ansys Employee
  
  Expressions are in Fluent 2019Rx (I'd advise using R3, current release). Alternatively you'll need a UDF for rotation speed/direction.

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