CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > CFX

Negative Cp for three straight blades VAWT

Register Blogs Community New Posts Updated Threads Search

Like Tree2Likes
  • 1 Post By ghorrocks
  • 1 Post By ghorrocks

 
 
LinkBack Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
Old   December 11, 2018, 11:49
Default Negative Cp for three straight blades VAWT
  #1
New Member
 
João de Sousa Bomfim Neto
Join Date: Oct 2017
Location: Maranguape, Ceará, Brasil
Posts: 25
Rep Power: 8
Joao Bomfim is on a distinguished road
Hi friends,
This is my first post. I am trying to validate an simulation using ansys CFX with FORTRAN routines, but for this case, the routines don't interfere. The simulation is a case transient, of rotor-stator with sliding mesh. In the article, for the TSR = 2.5, cp is approximately 0.14. The mesh in the work don't have many elements (43 524), but have a good quality (the less is 0.67) and is composite by hexaedra structured elements. The cp obtained in the simulation for the same TSR is about -0.016. I tryed increase the number of elements, but I obtained a similar result. The torque in the blades are calculated by CEL, adding for each blade, the torque in extern and intern side. The wind velocity is 8.5 m/s. Anybody have an idea what problem is it? If need an archive, I could provide. Sorry for my bad english. Thank's for the attention!
Attached Images
File Type: jpg contorno de velocidade.jpg (98.3 KB, 13 views)
File Type: png Torques.png (66.8 KB, 11 views)
File Type: jpg velocity_vectors.jpg (83.8 KB, 8 views)
File Type: jpg pressure.jpg (39.9 KB, 9 views)
Attached Files
File Type: txt vawt_0018.ccl.txt (45.0 KB, 2 views)
Joao Bomfim is offline   Reply With Quote

 

Tags
cfx, negative cp, tsr, vawt


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
[Other] mesh airfoil NACA0012 anand_30 OpenFOAM Meshing & Mesh Conversion 13 March 7, 2022 17:22
[blockMesh] non-orthogonal faces and incorrect orientation? nennbs OpenFOAM Meshing & Mesh Conversion 7 April 17, 2013 05:42
[blockMesh] error message with modeling a cube with a hold at the center hsingtzu OpenFOAM Meshing & Mesh Conversion 2 March 14, 2012 09:56
[blockMesh] BlockMesh FOAM warning gaottino OpenFOAM Meshing & Mesh Conversion 7 July 19, 2010 14:11
[blockMesh] Axisymmetrical mesh Rasmus Gjesing (Gjesing) OpenFOAM Meshing & Mesh Conversion 10 April 2, 2007 14:00


All times are GMT -4. The time now is 14:17.