CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Main CFD Forum

2 methods of computing cp curves for HAWT's

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   September 26, 2011, 05:16
Default 2 methods of computing cp curves for HAWT's
  #1
New Member
 
Join Date: Mar 2010
Posts: 25
Rep Power: 7
Dorit is on a distinguished road
Hello everyone,

I am doing research on wind turbines (HAWT's) aerodynamics using Fluent. Conceptually I want to analyse the staring-up performance of a HAWT by generating cp curves and looking at corresponding flow features. There are two ways of how to go about this:

1) Set up a steady state simulation (if possible!) of a HAWT, once converged extract the torque to plot the cp curve and then use the solution as an initial guess for a simulation at a higher rotational rate. The advantage of this approach is two fold: only 1/3 of the full domain is required and the cp curve can be generated reasonably quickly. However the other approach is:

2) Run a simulation at 0 rpm, extract the moment once converged and then use an interia model to calculate the new rotational speed at a certain time step. Repeat the process until a constant rpm is achieved. While this approach is computationally very expensive, I think that it may be able to capture unsteady processes that the first method is not able to predict.

Are there any people out there who have any experience/ideas/interesting thoughts on that subject? I would like to start an open conversation about the topic with anyone who's interested. For instance I'm especially interested in suggestions of how many time steps would be required at what time step size for method 2, if anyone has done something like that.

Dorit
Dorit is offline   Reply With Quote

Reply

Tags
hawt, inertia, power, start up, wind turbine

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
CFD algorithm design with reconfigurable computing Beatríz Navarro Main CFD Forum 1 June 25, 2006 14:25
CFD algorithm design with reconfigurable computing Beatríz Navarro FLUENT 0 June 24, 2006 18:22
Any questions about Runge-Kutta methods Runge_Kutta Main CFD Forum 32 March 1, 2005 02:41
comments on FDM, FEM, FVM, SM, SEM, DSEM, BEM kenn Main CFD Forum 2 July 18, 2004 18:28
I just wonder why "SIMPLE" Junseok Kim Main CFD Forum 21 May 20, 2001 08:47


All times are GMT -4. The time now is 00:49.