{"id":290537,"date":"2023-06-27T11:28:12","date_gmt":"2023-06-27T11:28:12","guid":{"rendered":"\/forum\/forums\/topic\/oscillating-airfoil-with-udf-function\/"},"modified":"2023-06-27T11:28:12","modified_gmt":"2023-06-27T11:28:12","slug":"oscillating-airfoil-with-udf-function","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/oscillating-airfoil-with-udf-function\/","title":{"rendered":"Oscillating airfoil with UDF function"},"content":{"rendered":"

Hello everyone.
I’m trying to perform a fluent analysis about an oscillating airfoil (I want to obtain the hysteresis loop of cl).
In this video<\/a>, the user create a circular zone around the airfoil and put it in rotation in the Cell zone conditions\/Mesh motion section, by indicating a constant angular velocity.
However, I want to rotate my airfoil in an oscillating manner (like a sinusoidal motion between a minimum and a maximum angle of attack), by indicating a variable angular velocity, function of time.<\/p>\n

It is possible to create a UDF function that assign the desired angular velocity to the circular mesh zone?<\/p>\n

By searching on the internet, I found two different macros, i.e. DEFINE_CG_MOTION and DEFINE_GRID_MOTION but I am a bit confused about how these macros work.<\/p>\n

There are the DEFINE_CG_MOTION and DEFINE_GRID_MOTION macros suitable for this case?<\/p>\n

I hope I was clear.<\/p>\n

Thank you.<\/p>\n

 <\/p>\n

Nicola Menga.<\/p>\n","protected":false},"template":"","class_list":["post-290537","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t