sliding mesh or general moving mesh approach?

eng_norouzi · June 11, 2016, 14:53

Hi,
Is it possible to simulate a rotor-stator problem using the general moving mesh? I mean to define a subdomain and give a rotational speed to it.
if yes, then what is the difference of this method with transient rotor-stator (sliding mesh) approach?

ghorrocks · June 12, 2016, 23:56

Yes, you can do rotating models with moving mesh. Doing it using moving mesh will be much slower, use more memory, be less accurate and be harder to converge. So it is highly recommended to use rotating frames of reference for rotating things.

slb@s8 · January 8, 2019, 08:13

How to give sliding or moving mesh in CFX for linear turbine cascade?
In linear cascade I cant give rotational axis. here I am attaching the image. I want to move the rod in the Y direction with a particular velocity. Please help

https://drive.google.com/open?id=1VY...4c4w0tQUbo7vdG

AtoHM · January 8, 2019, 08:36

In your Domain settings you can set mesh deformation. Within the boundary condition (e.g. at the blade wall) in boundary details a displacement can be defined. However, I am not sure if this is suitable for you.

ghorrocks · January 8, 2019, 19:47

You can define a linear motion with moving mesh as Michael describes. You can also approximate it by using a rotating domain and making the radius of rotation very large. Then the motion it generates will be almost linear. If you use this approach you will find it much faster and easier to converge compared to the moving mesh approach. But the motion will not be perfectly linear, it will curve a little.

June 11, 2016, 14:53	sliding mesh or general moving mesh approach?	#1
eng_norouzi Member ali Join Date: Feb 2011 Posts: 37 Rep Power: 15	Hi, Is it possible to simulate a rotor-stator problem using the general moving mesh? I mean to define a subdomain and give a rotational speed to it. if yes, then what is the difference of this method with transient rotor-stator (sliding mesh) approach?

January 8, 2019, 08:13	How to give sliding or moving mesh in CFX for linear turbine cascade?	#3
slb@s8 New Member Trot Join Date: Feb 2017 Posts: 5 Rep Power: 9	How to give sliding or moving mesh in CFX for linear turbine cascade? In linear cascade I cant give rotational axis. here I am attaching the image. I want to move the rod in the Y direction with a particular velocity. Please help https://drive.google.com/open?id=1VY...4c4w0tQUbo7vdG

January 8, 2019, 19:47		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	You can define a linear motion with moving mesh as Michael describes. You can also approximate it by using a rotating domain and making the radius of rotation very large. Then the motion it generates will be almost linear. If you use this approach you will find it much faster and easier to converge compared to the moving mesh approach. But the motion will not be perfectly linear, it will curve a little. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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June 12, 2016, 23:56		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Yes, you can do rotating models with moving mesh. Doing it using moving mesh will be much slower, use more memory, be less accurate and be harder to converge. So it is highly recommended to use rotating frames of reference for rotating things.

January 8, 2019, 08:36		#4
AtoHM Senior Member M Join Date: Dec 2017 Posts: 642 Rep Power: 12	In your Domain settings you can set mesh deformation. Within the boundary condition (e.g. at the blade wall) in boundary details a displacement can be defined. However, I am not sure if this is suitable for you.