[ruby_nuaa]

Hi guys,
I am performing an simulation of a 3D propeller. So the mesh requires two parts: one remain static and one rotate with the propeller. Both ones are cylinder. So here are my question:
(1) how can i define those two parts in pointwise? Can i seperate them using the set volume condition utility so they can create two seperate zones?
(2) as for the MRF solver,there should be two interfaces between the two zones, so can i just duplicate the domains between the two zones?

I am sure that someone has overcome this problem before. If you knew anything,enlighten me. Thanks in advance.

[tcarrigan]

Hello Ruby,

Great question. Typically you'll specify the two zones using two separate volume conditions. However, it all depends on the solver you are using.

What CFD solver are you using?

Travis

[rvl565]

Hi,

First you should specify the stator and the rotor as two separate volumes (CAE->Set volume conditions).
Second open the boundary conditions tab (CAE ->set boundary conditions). Here click on "select connections". Now you can select internal faces between the two volume zones. Each internal face has two sides. Select one face as the first interface and the other face as the second interface. You can differentiate between the two faces by the arrows you see on the faces (both faces have opposite arrows)
Hope this helps!

[tcarrigan]

Originally Posted by rvl565

Hi,

First you should specify the stator and the rotor as two separate volumes (CAE->Set volume conditions).
Second open the boundary conditions tab (CAE ->set boundary conditions). Here click on "select connections". Now you can select internal faces between the two volume zones. Each internal face has two sides. Select one face as the first interface and the other face as the second interface. You can differentiate between the two faces by the arrows you see on the faces (both faces have opposite arrows)
Hope this helps!

It depends on the solver. For example, an MRF simulation in OpenFOAM doesn't require a BC to be set on the interface between the two zones. You simply need to specify a zone for the rotating region. Generally, you'll need to specify the interface for a moving mesh simulation.

[rvl565]

Originally Posted by tcarrigan

It depends on the solver. For example, an MRF simulation in OpenFOAM doesn't require a BC to be set on the interface between the two zones. You simply need to specify a zone for the rotating region. Generally, you'll need to specify the interface for a moving mesh simulation.

I just assumed it was FLUENT! Sorry!
btw do you have experience with the mixing plane model in FLUENT?
if you do could you please help me out with my problem? (i have pasted the link)
http://www.cfd-online.com/Forums/flu...rsed-flow.html

[ruby_nuaa]

Originally Posted by tcarrigan

It depends on the solver. For example, an MRF simulation in OpenFOAM doesn't require a BC to be set on the interface between the two zones. You simply need to specify a zone for the rotating region. Generally, you'll need to specify the interface for a moving mesh simulation.

Hi, tcarrigan, thanks for the reply.
I am using OpenFOAM to do this. Your information helps a lot. I'll try it and update the outcome. Thank you.

[ruby_nuaa]

Originally Posted by tcarrigan

It depends on the solver. For example, an MRF simulation in OpenFOAM doesn't require a BC to be set on the interface between the two zones. You simply need to specify a zone for the rotating region. Generally, you'll need to specify the interface for a moving mesh simulation.

Hi @tcarrigan ,
I've defined the MRFzones in Pointwise by change the VC boundaries to "volumeToCell". It worked when I export the CAE files there's a "cellZone" file in the folder. There is also an "set" folder created in which describes the zones.
I think the "volumeToCell" looks like the utility "cellSet && cellZoneSet". Am I right?
For MRF solver like MRFsimpleFoam or MRFpimpleFoam, only the rotating zone need to be specified. But if I use an dynamic mesh solver, I need to specify the interface too. How can i obtain the interface between the rotating and the static zones?
There's several different VC boundaries in Pointwise for OpenFOAM, like "boundaryToFace" etc. I tied "boundaryToFace" to get the interface but it gives all the boundary faces as an whole which obtain other faces that I don't need. How can I only get the interface using Pointwise? Could you explain to me how to specify the interface in Pointwise?

Forgive me for my bad discription,And many thanks.

Best regards

[ruby_nuaa]

Originally Posted by rvl565

Hi,

First you should specify the stator and the rotor as two separate volumes (CAE->Set volume conditions).
Second open the boundary conditions tab (CAE ->set boundary conditions). Here click on "select connections". Now you can select internal faces between the two volume zones. Each internal face has two sides. Select one face as the first interface and the other face as the second interface. You can differentiate between the two faces by the arrows you see on the faces (both faces have opposite arrows)
Hope this helps!

Hi guys!
this is embarrassing, I got the dynamic mesh problem fixed following @RacMat post. I should have checked this first. sorry.

many thanks .