Changing RPM

February 28, 2008, 17:31

Hi I have modeled a vertical turbine and I need the transient results. So I made a sliding mesh model. I want that the turbine starts from RPM=0 at t=0 and RPM increases at each time step to reach its actual RPM. In boundary condition I want to set variable RPM for one of my zones which is included the turbine. But I found that when I choose moving mesh I dont have this opportunity to set variable RPM or select UDF for that. Is there any way to change RPM by time in fluent for sliding mesh? my e-mail is amir.birjandi@gmail.com I would appreciate that if some one can help me.

March 3, 2008, 15:35

Hello,

You can only define velocity (transitional or rotational) of the mesh, not acceleration with the sliding mesh. Perhaps you have to use dynamic mesh instead.

March 4, 2008, 01:51

You can very probably do this with an udf... Check the udf tutorial and manual...

Mateus

February 28, 2008, 17:31	Changing RPM	#1
Amir Hossein Birjandi Guest Posts: n/a	Hi I have modeled a vertical turbine and I need the transient results. So I made a sliding mesh model. I want that the turbine starts from RPM=0 at t=0 and RPM increases at each time step to reach its actual RPM. In boundary condition I want to set variable RPM for one of my zones which is included the turbine. But I found that when I choose moving mesh I dont have this opportunity to set variable RPM or select UDF for that. Is there any way to change RPM by time in fluent for sliding mesh? my e-mail is amir.birjandi@gmail.com I would appreciate that if some one can help me.

March 3, 2008, 15:35	Re: Changing RPM	#2
Tito Guest Posts: n/a	Hello, You can only define velocity (transitional or rotational) of the mesh, not acceleration with the sliding mesh. Perhaps you have to use dynamic mesh instead.

March 4, 2008, 01:51	Re: Changing RPM	#3
mateus Guest Posts: n/a	You can very probably do this with an udf... Check the udf tutorial and manual... Mateus

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