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stator rotor contacted

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Old   June 12, 2019, 05:50
Default stator rotor contacted
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shach
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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!
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Old   June 13, 2019, 04:28
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Tom Fahner
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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
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Old   June 13, 2019, 05:45
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shach
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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 View Post
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
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