CFD Online Logo CFD Online URL
Home > Forums > CFX

Integral Force calculation in CFX 12 - wind blade case

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

LinkBack Thread Tools Display Modes
Old   April 27, 2011, 04:04
Default Integral Force calculation in CFX 12 - wind blade case
New Member
Join Date: Jan 2011
Posts: 20
Rep Power: 8
LittleBart is on a distinguished road
Hi all,

I'm solving wind blade case as part of my HAWT analysis. I have geometry of a blade+nacelle-like body+ cylindrical far field (120 degree part).
BCs - top and bottom of the cylindrical FF as Inlet and Outlet
external surface as Wall
+ interface BCs for Fluid/Solid interfaces
Details - 10 m/s flow for Inlet
1 atm static pressure for Outlet
Rotated reference frame is specified for inlet velocity to simulate rotation of the wind turbine rotor.

Task - to evaluate torque of the rotor in steady state (with constant rotational velocity) - shaft torque

I've performed this analysis for different angles of attack of the blade but the result Torque_X (rotor is X oriented) was very small - 0.02 Nm or smth around.

Then I've tried to calculate overall force on the blade. I've used areaInt(Force)@ on the surface of the blade (2D region). But the results are still not logical - couple of Ns or even negative values.

What I'm doing wrong? And how to calculate torques and integral values correctly?

Here some pics (whole rotor is made by using mirroring function of CFD Post)

LittleBart is offline   Reply With Quote


cfx, torque, 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
Modeling of boundary layer wind profile in CFX 5 Cuong NK CFX 7 April 26, 2012 08:23
how to simulate wind blade hawt cekyoo STAR-CCM+ 1 March 22, 2011 09:34
Modelling of 2D Wind Turbine Blade (HAWT) Richeom FLUENT 1 August 11, 2010 04:18
how to calculate prssure force & lift force in CFX zaidun CFX 4 March 28, 2006 02:06
how to include body force in cfx selvam R.P CFX 4 November 25, 2005 05:01

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