[HuseyinCan]

Hello guys
I have done a simulation of savonius wind turbine with
two domain inner rotating 20rad/s outer stat.
inlet 10m/s
Sliding mesh

k-epsilon realizable scalable
In cfd post there are two options for velocity

velocity-velocity in stn frame when i choose velocity results is not looking right it seems there is wall between rot.and sta. domain but it seems normal in velocity stn frame

what is the difference between them ?

[vinerm]

Since two different reference frames can be defined for this problem, you can plot velocity or any other field in both of these frames. Stationary implies inertial reference frame, such as, observation by a person standing and looking at the rotating turbine. Another one is the frame of the turbine itself. A person standing at the center of the turbine and rotating with it will observe different field.

[HuseyinCan]

Originally Posted by vinerm

Since two different reference frames can be defined for this problem, you can plot velocity or any other field in both of these frames. Stationary implies inertial reference frame, such as, observation by a person standing and looking at the rotating turbine. Another one is the frame of the turbine itself. A person standing at the center of the turbine and rotating with it will observe different field.

Thank you for your reply also i want to ask you something else in cfd post i need to find torque on the blade.I have find it but it is showing torque for singe time step if i take average of it it would be right or is there another way

[vinerm]

Plot a transient chart. Then export the graph and calculate average over time.

Other option is to write a script using Perl Power Syntax in CFDPost, but the former option is simpler if you have never done programming in Perl.