Learning Forum

[ricardo]

Hi all,

I am having trouble doing a simulation for the first time using fluent. 

I have this small fan that I would like to simulate, 

It looks good in space claim

It looks good in meshing

It looks good in setup

But after the solution, somehow the fan moves outside the box

 

I spend the whole day finding out what went wrong but to no avail.

Hopefully, somebody can pinpoint the error I made

 

Edit:

I noticed that there is also an option for rotation in "reference frames" tab. But I define the rotation speed in the fluid tab instead of the reference frame. Not sure what the difference is..

Thank you

 

Regards,

Ricardo

[Federico Alzamora Previtali]

Hello Ricardo, 

I suggest you double check the rotation-axis origin, currently set as 0,0,0. 

[ricardo]

Thank you for pointing that out, Federico, 

Weirdly, the tutorials that I watched did not change the rotation-axis origin. So I assumed the rotation axis was already at the object's centre. 

I changed the axis according to the SpaceClaim object coordinates and it works now. 

However, I still could not rotate the fan in the simulation. In the animation, it does not move. 

Do I need to do the rotation in both the boundary condition and cell zone?

 

Thanks again

 

Regards,

Ricardo

[Federico Alzamora Previtali]

Hello Ricardo, 

I'm glad my first suggestion provided some resolution. About your boundary conditions, yes you should also set that to moving wall. Just make sure that your angular speed is set to 0 rad/s if you're using "Relative to adjacent cell zone" formulation. Otherwise, you can use 40rad/s with "absolute" formulation.