# Vertical Axis Wind Turbine Rotating Domain Problems

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 June 25, 2011, 14:24 Vertical Axis Wind Turbine Rotating Domain Problems #1 New Member   Join Date: Mar 2009 Posts: 14 Rep Power: 9 Hello, I am trying to run a transient simulation of the rotating blades of a vertical axis wind turbine in CFX. My domain is thin in order to approximate a 2D simulation. My domain looks similar to this image There is a rotating ring shaped domain containing the blade profiles, and a stationary domain on the inside and outside of the rotating domain. The wind flows from left to right. The problem I am encountering is that it appears that the fluid within the rotating domain is being given an angular velocity. I have run a mesh similar to the one shown but without any blade geometry and I find that the fluid in the rotating domain still has an angular velocity. I was expecting the flow to pass straight through the rotating domain unless it was disturbed by an object like the turbine blade. Does anyone have any suggestions on how to set up a simulation like this? Here are some of the settings I am using. Analysis Type: Transient Stationary Domains: Stationary Rotating Domain: - Rotating at a fixed angular velocity For the interfaces between the stationary and rotating domains, I am using: Interface Type: Fluid Fluid Interface Models: General Connection Frame Change/Mixing Model: Transient Rotor Stator Pitch Change: None Mesh Connection Method: GGI Thanks for any suggestions!

 June 26, 2011, 06:16 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,707 Rep Power: 98 You are viewing the velocity in the local frame of reference. What you are looking for is the velocity vectors in the absolute frame - so look at the variable "Velocity in Stationary Frame".

 June 26, 2011, 10:52 #3 New Member   Join Date: Mar 2009 Posts: 14 Rep Power: 9 Hi Glenn, Ahh, now everything looks fine. Thanks very much!

April 29, 2012, 11:17
#4
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nizam
Join Date: Apr 2012
Posts: 8
Rep Power: 6
Quote:
 Originally Posted by TWaung Hello, I am trying to run a transient simulation of the rotating blades of a vertical axis wind turbine in CFX. My domain is thin in order to approximate a 2D simulation. My domain looks similar to this image There is a rotating ring shaped domain containing the blade profiles, and a stationary domain on the inside and outside of the rotating domain. The wind flows from left to right. The problem I am encountering is that it appears that the fluid within the rotating domain is being given an angular velocity. I have run a mesh similar to the one shown but without any blade geometry and I find that the fluid in the rotating domain still has an angular velocity. I was expecting the flow to pass straight through the rotating domain unless it was disturbed by an object like the turbine blade. Does anyone have any suggestions on how to set up a simulation like this? Here are some of the settings I am using. Analysis Type: Transient Stationary Domains: Stationary Rotating Domain: - Rotating at a fixed angular velocity For the interfaces between the stationary and rotating domains, I am using: Interface Type: Fluid Fluid Interface Models: General Connection Frame Change/Mixing Model: Transient Rotor Stator Pitch Change: None Mesh Connection Method: GGI Thanks for any suggestions!
would you please tell me,what software did you use to meshing the model? i'm doing the same project as you are, but the problem is, the solver state that my interface between stationary and rotating domain require pitch angle, but i don't know what's the value for my pitch angle...i really hope that you can help me, really appreciate your advice..

May 1, 2012, 03:14
#5
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nizam
Join Date: Apr 2012
Posts: 8
Rep Power: 6
Quote:
 Originally Posted by ghorrocks You are viewing the velocity in the local frame of reference. What you are looking for is the velocity vectors in the absolute frame - so look at the variable "Velocity in Stationary Frame".
i'm doing the same project as him, but the problem is, the solver state that my interface between stationary and rotating domain require pitch angle, but i don't know what's the value for my pitch angle...i really hope that you can help me, really appreciate your advice..

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