[nikhilbala]

Dear all,

I'm working on a project to determine the Swirl number of a component, which imparts a tangential component to an incoming constant velocity profile. Based on literature, I tried both Reynolds stress model and the K-omega RNG models to simulate the test case. In such a case, I expected a constant tangential velocity at the exit of the swirler, but did not come out as expected. I expect the problem is in how i defined the co-ordinate system. Even though I tried to follow the guidelines to define the flowfield for swirling flows, it did not help much. I have attached images of the pathlines and the exit velocity profiles after the swirler.


Much Thanks,

Nikhil

[LuckyTran]

Show the pane where you defined the coordinate system for the tangential and radial velocities.

[nikhilbala]

Thanks for the reply,

I'm not quite sure where that is. Can you direct me. Maybe that is what ive missed.

Nikhil

[LuckyTran]

Look for the Fluid Panel. I think it's in boundary conditions. It might be in cell zone conditions. I forget.

[nikhilbala]

Please check the uploaded image. I think it is the default settings. it was under cell zone conditions.

[LuckyTran]

Maybe you placed the origin in the wrong place?

[nikhilbala]

I checked it based on how the geometry was specified. The origin is in the right place. It definitely has something to do with how the co-ordinate system is interpreted. Maybe you have suggestions on how to post process and find the tangential velocity from the velocity magnitude data and since axial velocity also has a constant profile, it might be possible if to do co-ordinate transformation in post processing or with some other plotting software.

Thanks

Nikhil

[LuckyTran]

Your rotation axis origin is [0,0,0]. Where is this in the figure?

It looks like you need to move it to some negative x coordinate so that it corresponds with your swirler.

[nikhilbala]

Thanks LuckyTran! It worked.