vorticity resolution in paraFoam
 

Dear all,

I am using the "Filters/calcualteDerivatives" option to visualise the vorticity magnitude. But the resolution is quite not good.
Attached are two snapshots of the velocity magnitude and the vorticity magnitude.
Can someone direct me on how to get a resolution of the vorticity similar to that of the velocity?

Please, note that in the down-scroll bar, the velocity can be show with a bad resolution as well. But the vorticity has the bad one only.

best regards.

Hi ebah,

do you mean sth like that (attachment)?
I used icoFoam and the post-utility "vorticity"; there you get the interpolation solution.

Hope it helps you.

Tobi

Thank you Tobias,

This is what I need.
Can tell how you obtain it.
Say I have run my case and have the velocity field; how can continue from there?
Or should I re-start the run and compute the vorticity in the same manner as the pressure and velocity fields?

Thank you for time.

Hi,

you just have to type

after your simulation in your case directory.
After that the utility calculates the vorticity from the velocity field.

Tobi

Thank you very much.
This works perfect.

my best regards.

Doesn't show vorticty?
 

Hi,

I've used the vorticity, and ptot utilities after solving for my case, and it computes the vorticity and ptot fields (I can tell it's worked because the data is there in the folders 0, 0.1, etc) but when I open the case in ParaFoam it still only gives me options to display U, Umag, and p, not vorticity or ptot -- how do I get this?

Thanks
Olie

Fixed!
 

Sorry forget this - just found it!

I am having the same problem. Can you please tell how to fix this ?

Sorry, how did you find the ptot data? I have the same problem in finding it in the paraFoam

When I use this utility and type vorticity after my simulation I do get the poor resolution aswell. How do you interpolate the values? Can you elaborate?

And sorry for posting in such old thread :-)

If you use the paraview filter Cell to Point Data then the resolution looks better for any field or scalar variable because I'm guessing that paraview interpolates data at each point from the cell centered value. Could this be an option?

Dear Foamer
I work on plunging airfoil and I want to have some line like attach picture in downstream. please help me what should I do? is it vorticity line on velocity contour?