stator rotor contacted

shach934 · June 12, 2019, 06:50

Hi,
I am using Openfoam to simulate the rotation of a propeller within a cylinder region. In reality, the stator and rotor have a thin gap. But it is really hard to get a good mesh when the thin gap is included. It is too thin and very very fine mesh needed to resolve this. And then the time step is restricted to 10e-6 due to the courant number requirement.
Now I want to remove this gap and let the stator and rotor contact with each other. They will share some faces. But then I don't know how to define the rotating region then. I am using ANSA to generate mesh. Anyone has experience about this could suggest something?? I will be really grateful.
Thanks!

tomf · June 13, 2019, 05:28

Hi,

I think you should be able to work with ACMI interface, where you can have uncovered faces in the AMI interface act as if they touch a wall. It is similar in set-up as AMI, which can be done in ANSA via the OPENFOAM Deck -> AUXILIARIES -> INTERFACE. Not sure if there is any tutorial available for this.

As for the OpenFOAM part, best guess would be to search this forum.

Regards,
Tom

shach934 · June 13, 2019, 06:45

Hi Tom,
Thanks for your reply!
I searched in the forum and got the same impression that ACMI should be the suitable boundary condition I need. I am now doing some trail test on ACMI. I still a little confused about the interface definition. So thanks for the suggestion about the ANSA, this is exactly what I need now!

I will update the case when I got some result.
Thanks!

Quote:

Originally Posted by tomf

Hi,

I think you should be able to work with ACMI interface, where you can have uncovered faces in the AMI interface act as if they touch a wall. It is similar in set-up as AMI, which can be done in ANSA via the OPENFOAM Deck -> AUXILIARIES -> INTERFACE. Not sure if there is any tutorial available for this.

As for the OpenFOAM part, best guess would be to search this forum.

Regards,
Tom

June 12, 2019, 06:50	stator rotor contacted	#1
shach934 New Member shach Join Date: Apr 2019 Posts: 26 Rep Power: 7	Hi, I am using Openfoam to simulate the rotation of a propeller within a cylinder region. In reality, the stator and rotor have a thin gap. But it is really hard to get a good mesh when the thin gap is included. It is too thin and very very fine mesh needed to resolve this. And then the time step is restricted to 10e-6 due to the courant number requirement. Now I want to remove this gap and let the stator and rotor contact with each other. They will share some faces. But then I don't know how to define the rotating region then. I am using ANSA to generate mesh. Anyone has experience about this could suggest something?? I will be really grateful. Thanks!

June 13, 2019, 05:28		#2
tomf Senior Member Tom Fahner Join Date: Mar 2009 Location: Breda, Netherlands Posts: 647 Rep Power: 32	Hi, I think you should be able to work with ACMI interface, where you can have uncovered faces in the AMI interface act as if they touch a wall. It is similar in set-up as AMI, which can be done in ANSA via the OPENFOAM Deck -> AUXILIARIES -> INTERFACE. Not sure if there is any tutorial available for this. As for the OpenFOAM part, best guess would be to search this forum. Regards, Tom vangelis likes this.