Changing RPM
 

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.

Re: Changing RPM
 

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.

Re: Changing RPM
 

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

Mateus