Inlet boundary condition of swirl angle
 

Dear Openfoamers,

I want to simulate a jet flow which has a swirl angle of 45 degree at inlet. How can i define this bc?

Best regards ,

Peng

What about this bc here:
swirlFlowRateInletVelocity

http://openfoam.github.io/Documentat...ml/a02600.html

this should do what you want. You have to calculate the flow rate and rpm so that you get a 45 degree swirl angle.

Thanks, but could you please tell me more about the relation between rpm and swirl angle?

"This boundary condition provides a volumetric- OR mass-flow normal vector boundary condition by its magnitude as an integral over its area with a swirl component determined by the angular speed, given in revolutions per minute (RPM)"

As I understand it:
Mass or volumetric flow define the normal velocity component and rpm the rotational. You have to calculate the exact values you need according to your problem.