[Ledeeb]

Hello,

My case is very simple and straight forward.

I Have a can (Cylinder) in 3D that is rotating filled with soda and I want to plot the velocity distribution inside the can.

I have 2 Names selections: Wall and Top Wall (Shown in the figure below)

The problem is: In Boundary Conditions, I am putting both Wall and Top Wall Rotating (for the same Rotating-Axis Direction and same angular speed).

And I have wrong results. I think fluent didn't understand what I want, which is a simple cylinder rotating around its fixed axis.

Any help?
Thanks a lot

[CeesH]

Hi,

Can you elaborate in what way your results are wrong?

[ghost82]

Moreover I think that you should setup a single reference frame or moving mesh simulation..but you should obtain correct/similar results by assigning only rotational velocity to walls. Check your bc carefully!

[ghost82]

I did a test; for the moving mesh case take care to the timestep!
http://www.cfd-online.com/Forums/mai...ving-mesh.html

[Ledeeb]

Thanks a lot guys.

Ghost 82, a big thanks.

I need your help please since you did the same simulation; My problem description now is:

0) Rotating can (diameter=6.6 cm; height=0.2 cm; angular velocity=10 rad/s)

1) Steady, Energy Equation Off (Just want to plot the velocity);

2) I'm using in the BC the following:Rotational Walls (with angular speed = 10),and the Rotational Top Wall.Origin axis (0 0 0) and Direction axis (1 0 0) for Wall and Top Wall;

3) In the Cell Zone Condition: I selected the material inside the can which is soda, and The Mesh and frame Motion always not checked.

4) Velocity Initialization with V(z)= 0.33 m/s

5) First when I selected calculate, it rapidly finish the calculation (Almost 2 seconds) which I am sure that this is wrong.
Plus on the Line (shown in Fig. below), the velocity distribution is always equal to 0.33 m/s. But on the face of the Wall I have the right distribution for the Velocity (Linear Distribution).

I think my problem is major problem, but I can't see where.

Thanks a lot, for your help and support.

[ghost82]

How many iterations did you set? What are your convergence criteria?

[Ledeeb]

Thanks Guys, it worked.