Hello to everyone,
I am new CFD user, and i need some help with a simple 2D geometry.
I want to simulate the flow between a stator and a rotor. The problem is that simulation CFD 2015 seems to calculate velocities and pressure where there is not fluid, and the results doesnt seem to be accuracy.
Please, help!!!.
I have attached the support file.
Lot of thanks to everyone!
Hi,
I'm sure we can help. Need to take a step back and ask a few questions first though.
I guess I am a littlle confused by the axisymmetric in Y choice, was that deliberate?
What is it that you need to know from the CFD analysis? Just to see the flow or get something quantative?
Could I also ask if you have run through any tutorial models from the help?
I am guessing that this should simply be a 2D model, in which case I think this article and associated links will be most useful:
Rotating Region Best Practices
Thanks,
Jon
There are some things you need to do to set up the model properly:
Please consult help documentation or tutorials that will help you on a step-by-step basis.
Hope this helps.
The rotating region is also water and you will see non-zero velocities in this region- this is normal. What is meant by the phrase "rotating region" is that the coordinate frame attached to same is actually rotating bu that the fluid in this region may not exactly follow the rotation as in Omega Cross R, where Omega is the (prescribed) speed of the rotating frame.
To see the velocities in the "stator" part, you need to run the analysis with a sufficiently small time step and at least 150 time steps, such as "3-degrees per step" which is available in the solver dialog.
the problem persist although using motion instead of rotational region, using ADV5 and a really small time step :S
Use a rotating region, this way we can still have a boundary layer in the mesh and this problem should go away, far better 🙂
Also, the 2D setting as you now have it is OK.
Axisymmetric assumes that it is symmetric around an axis also, so this was initally a toroid in shape - I could not get my head around how this could be built 😄
but using rotation region, the program seems to see the rotor (which is a solid part) as it was fluid, because there are pressures and velocities.
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