Induced Drag Calculation with UDF or Expression

- March 3, 2020 at 5:46 pm
  
  mohanpannirselvam08
  Subscriber
  
  Hallo Everyone,
  
  I need your expertise with dire urge. I am planning to calculate the Induced Drag component of 3D Wing using the Far-Field Technique (also known as Trefftz Plane method)
  
  For that i neeed to run a surface integral of the momentum equation on a 2D plane which is perpendicular to the flow velocity U.
  
  The Model Diagram and the equation is as follows:
  
  al
  
  As the equation says, i would like to access the Surface integral experssion. From there i would to access pertubation velocity components and multiply them with the area of the cell (dy * dz).
  
  Has anyone done this kind of calculation before? If anyone can provide any hints of doing thsi , it would be much appriciated.
  
  I have tried the UDF but I cant understand it very well and how to access the surface integral is still a challange for me.
  
  Now I am looking at the Expression functionality in the post processor. Maybe that could allow me to key in my functions.
  
  Thanks for your kind support.
  
  Mohan Pannirselvam
  
  Hamburg,Germany
- March 4, 2020 at 12:00 pm
  
  Rob
  Forum Moderator
  
  Surface integrals are in the Reports. You may need to combine this with a Custom Field Function if what you want isn't available (in the User Defined tab).