Enabling Acceleration in Moving Reference Frame

jpo · May 3, 2009, 11:42

Dear All,

Is there a UDF to enable acceleration of moving reference frame (MRF) in Fluent 6.2? The standard Fluent capabilities allow only for a constant angular velocity.

This thread:
http://www.cfd-online.com/Forums/flu...imulation.html
says that such UDF exists on fluentusers.com

Where should I look for it? (which directory, path, section etc)
Regards.

Thriller · October 8, 2009, 11:24

Can you shed some light on how to implement this if you ever found it?

Thank you.

jpo · October 8, 2009, 13:26

Hello,

Please read this thread:
http://university.fluent.com/forum/v...a13ec3903bf2ac

It explains the solution. As I recall, I generated a profile for the rotation of the entire system and used dynamic mesh.

Regards.

Thriller · October 8, 2009, 13:43

Thanks for your answer. Actually I want to accelerate the reference frame, not rotating but translating it.

I cannot access fluentusers.com but I think it suggests to use a dynamic mesh. I assume this means moving the object instead of the fluid, doesn't it? The problem with using a dynamic mesh is that the body displacement is much larger than the domain size...

jpo · October 8, 2009, 14:29

Yes, I needed to rotate the entire domain. You can control displacement with your UDF/profile.

May 3, 2009, 11:42	Enabling Acceleration in Moving Reference Frame	#1
jpo Member Join Date: Apr 2009 Posts: 94 Rep Power: 17	Dear All, Is there a UDF to enable acceleration of moving reference frame (MRF) in Fluent 6.2? The standard Fluent capabilities allow only for a constant angular velocity. This thread: http://www.cfd-online.com/Forums/flu...imulation.html says that such UDF exists on fluentusers.com Where should I look for it? (which directory, path, section etc) Regards.

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October 8, 2009, 11:24		#2
Thriller New Member Join Date: Apr 2009 Posts: 7 Rep Power: 17	Can you shed some light on how to implement this if you ever found it? Thank you.

October 8, 2009, 13:26		#3
jpo Member Join Date: Apr 2009 Posts: 94 Rep Power: 17	Hello, Please read this thread: http://university.fluent.com/forum/v...a13ec3903bf2ac It explains the solution. As I recall, I generated a profile for the rotation of the entire system and used dynamic mesh. Regards.

October 8, 2009, 13:43		#4
Thriller New Member Join Date: Apr 2009 Posts: 7 Rep Power: 17	Thanks for your answer. Actually I want to accelerate the reference frame, not rotating but translating it. I cannot access fluentusers.com but I think it suggests to use a dynamic mesh. I assume this means moving the object instead of the fluid, doesn't it? The problem with using a dynamic mesh is that the body displacement is much larger than the domain size...

October 8, 2009, 14:29		#5
jpo Member Join Date: Apr 2009 Posts: 94 Rep Power: 17	Yes, I needed to rotate the entire domain. You can control displacement with your UDF/profile.