CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > Siemens > STAR-CCM+

Trouble modeling wind turbine NREL Phase IV

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   November 2, 2020, 11:53
Default Trouble modeling wind turbine NREL Phase IV
  #1
Member
 
Soroush Kargar
Join Date: Apr 2017
Posts: 45
Rep Power: 5
Seervan is on a distinguished road
I am having a hard time simulating NREL PHASE IV Wind Turbine. I use K-w turbulence model, tried polyhedral and trimmer messier, different sizes of prism layer thickness and numbers and even different turbulence models. I wan to get pressure coefficient over span-wise foil section and the power. To lower my Y+ I added extra prism layers but that resulted in much lower power calculation. For higher inlet wind speeds this just gets much worse so any help would be greatly appreciated.
Attached Images
File Type: jpg 2020-11-02 10.29.22.jpg (99.4 KB, 5 views)
File Type: jpg 2020-11-02 10.29.53.jpg (165.5 KB, 5 views)
File Type: jpg 2020-11-02 10.30.01.jpg (22.0 KB, 5 views)
Seervan is offline   Reply With Quote

Old   November 6, 2020, 09:46
Default
  #2
Senior Member
 
Matt
Join Date: Aug 2014
Posts: 847
Rep Power: 14
fluid23 is on a distinguished road
You mesh needs a lot of work. Starting with image 1, your growth rate away from the blade is too aggressive. I am also not sure that your domain is large enough, but its hard to tell. Also there is a prism mesh at your rotating region interface that is not needed.

Image 2 - lots more issues. Your surface mesh isn't refined enough and your leading edge is junk. Likewise, your trailing edge prism mesh totally breaks down. I see no wake refinement at all and a mesh that is generally too coarse to get results that can be validated.

Image 3 - the scale on your y+ graph makes it impossible to see what the distribution is. If you are using k-w and the near wall model then you need y+<=1. However, I think the default is an k-w SST with an all wall model that uses a blending function. With k-w SST/all wall model you can have 1<y+<100 (some say as high as 300), but you won't be capturing the viscous sublayer. if that is important to you. This also breaks down in the blending function, I think between 5<y+<50 it interpolates the near wall and high wall model to approximate a solution.

In general, pay attention to volume change, aspect ratio and prism layer retraction. These can all get you into trouble with your mesh.
fluid23 is offline   Reply With Quote

Reply

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
IDDES NREL wind turbine mehran_ansary FLUENT 0 September 22, 2017 06:10
CFD analysis on wind turbine rotor Ken (Wind Turbine CFD Super Rookie) Main CFD Forum 45 February 9, 2016 15:07
Negative lift in Modeling an airfoil design for wind turbine Ram209e Main CFD Forum 3 August 8, 2012 23:39
CFX Wind turbine mesh trouble and solver failure tallliam CFX 9 April 29, 2012 23:55
Basics in modeling a wind turbine CFDbeginner ANSYS Meshing & Geometry 0 October 21, 2010 15:27


All times are GMT -4. The time now is 08:12.