Wind Turbine RPM in CFD

Shamoon Jamshed · January 24, 2012, 04:17

Hi All

I want to run steady simulations of a wind turbine blade but I want that I don't need to specify rpm in the software rather the program itself rotate the blade and calculate rpm. I will have to specify only the wind velocity. Is it possible in case of steady state simulations?

Regards

Trues · January 27, 2012, 18:16

Is the problem that you don't know the RPM of the turbine and would like to model the steady state at a realistic speed? Or are you trying to do something more complex?

Far · January 29, 2012, 07:19

You want that the incoming air rotate the wind turbine. This is not possible in Fluent and CFX (according to my limited knowledge).

Dimeflow · January 30, 2012, 08:12

Quote:

Originally Posted by Shamoon Jamshed

Hi All

I want to run steady simulations of a wind turbine blade but I want that I don't need to specify rpm in the software rather the program itself rotate the blade and calculate rpm. I will have to specify only the wind velocity. Is it possible in case of steady state simulations?

Regards

Hi Shamoon, what software are you using? The approach I woud use would be to define a rotating region around the blades and assign an (estimated RPM). When you've a solution I'd measure the torque on the blades and adjust the RPM accordingly, and re-run. When the torque approaches zero, would this not indicate the operating RPM at the given boundary conditions?

I appreciate the above might seem a little long-winded (no pun intended) but you could probably set up a monitor point which measures the torque on the blades so you could change the RPM dynamically during the solving process.

Shamoon Jamshed · February 13, 2012, 12:42

Your quote
"Hi Shamoon, what software are you using? The approach I woud use would be to define a rotating region around the blades and assign an (estimated RPM). When you've a solution I'd measure the torque on the blades and adjust the RPM accordingly, and re-run. When the torque approaches zero, would this not indicate the operating RPM at the given boundary conditions?

I appreciate the above might seem a little long-winded (no pun intended) but you could probably set up a monitor point which measures the torque on the blades so you could change the RPM dynamically during the solving process."

Your quote has raised a few questions:

In the first para what do you mean by "When the torque approaches zero" Does it mean that while observing the monitor for Cm about an axis the moments become constant (although still it cant be zero I believe).

Why to monitor some point to measure the torque while this can be done with monitor Moment coefficient about the rotation axis.
How can the RPM be changed dynamically with this?

January 24, 2012, 04:17	Wind Turbine RPM in CFD	#1
Shamoon Jamshed Member Shamoon Jamshed Join Date: Apr 2009 Location: Karachi Posts: 73 Rep Power: 5	Hi All I want to run steady simulations of a wind turbine blade but I want that I don't need to specify rpm in the software rather the program itself rotate the blade and calculate rpm. I will have to specify only the wind velocity. Is it possible in case of steady state simulations? Regards

January 29, 2012, 07:19		#3
Far Senior Member Far (turboenginner@gmail.com) Join Date: Mar 2009 Location: Islamabad Pakistan Posts: 1,193 Blog Entries: 1 Rep Power: 14	You want that the incoming air rotate the wind turbine. This is not possible in Fluent and CFX (according to my limited knowledge). __________________ Best Regards Far

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January 27, 2012, 18:16		#2
Trues New Member Dustin Join Date: Jan 2012 Posts: 7 Rep Power: 2	Is the problem that you don't know the RPM of the turbine and would like to model the steady state at a realistic speed? Or are you trying to do something more complex?

February 13, 2012, 12:42		#5
Shamoon Jamshed Member Shamoon Jamshed Join Date: Apr 2009 Location: Karachi Posts: 73 Rep Power: 5	Your quote "Hi Shamoon, what software are you using? The approach I woud use would be to define a rotating region around the blades and assign an (estimated RPM). When you've a solution I'd measure the torque on the blades and adjust the RPM accordingly, and re-run. When the torque approaches zero, would this not indicate the operating RPM at the given boundary conditions? I appreciate the above might seem a little long-winded (no pun intended) but you could probably set up a monitor point which measures the torque on the blades so you could change the RPM dynamically during the solving process." Your quote has raised a few questions: In the first para what do you mean by "When the torque approaches zero" Does it mean that while observing the monitor for Cm about an axis the moments become constant (although still it cant be zero I believe). Why to monitor some point to measure the torque while this can be done with monitor Moment coefficient about the rotation axis. How can the RPM be changed dynamically with this?