CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

Zone motion to control turbine pitching

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

LinkBack Thread Tools Search this Thread Display Modes
Old   December 14, 2017, 11:00
Default Zone motion to control turbine pitching
New Member
Ethan Walker
Join Date: Dec 2017
Posts: 4
Rep Power: 7
EthanWalker is on a distinguished road

This is quite a specific issue and I was hoping someone here might have experience or know of something that I could try.

I am using Ansys fluent 17.1 to model a variable pitch vertical axis turbine. Each blade has its own specific rotating domain within an overall turbine rotating domain. I control the pitch of each blade independently by controlling the rotational velocity of each blade domain through the use of a UDF.

my issue is that in the turbine that I am modelling the blades all pitch outwards the whole way round (rotate in the opposite direction of the turbine), the greater the pitch the more I specify the blade domain rotational speed. so I specify the rotational velocity always increasingly negative in rads/s ( eg -0.08 to -6 rad/s)

when I get to the end of the rotation (at 360 degrees azimuth) the rotational velocity/pitch is approximately -6 rad/s, but at the start of the next rotation the pitch is only -4 degrees (approx 0.08 rad/s) this sharp instantaneous drop in rotational velocity causes my model to go unstable (turbulence and velocity unrealistic)

I cannot think of a method where I can reduce the rotational velocity without affecting the pitch angle of the blade.

If anyone has any advise/tips that would be great.

EthanWalker is offline   Reply With Quote


ansys, fluent, fluent - udf, turbine, udf cg motion

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
CFD analysis on wind turbine rotor Ken (Wind Turbine CFD Super Rookie) Main CFD Forum 45 February 9, 2016 15:07
Error in solution using "Grid Interface" agustinvo FLUENT 4 January 20, 2015 13:03
Different zone motion and mesh motion preview aamer FLUENT 5 September 24, 2012 14:58
Porosity profile, dividing a zone, or getting zone location from zone khoopes FLUENT 0 June 2, 2012 20:39
Error to re-open fluent case file J.Gimbun FLUENT 0 April 27, 2006 09:42

All times are GMT -4. The time now is 08:47.