CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

Axisymmetric Vs. 3D issue?

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 23, 2017, 12:17
Default Axisymmetric Vs. 3D issue?
  #1
Senior Member
 
tareqkh's Avatar
 
CFD
Join Date: Nov 2010
Location: United States
Posts: 243
Rep Power: 16
tareqkh is on a distinguished road
Hi All,

I have been working on the ActuatorDisk model "code" provided in the following link http://www.tfd.chalmers.se/~hani/kurser/OS_CFD_2010/erikSvenning/erikSvenningReport.pdf. "In the implementation, the momentum transferred to the fluid is added as a volume force. The volume force varies in the radial direction and it is calculated such that a prescribed total thrust and torque is imposed on the fluid. For the volume force in the axial and tangential direction, expressions similar to those given in are adopted. The volume forces are computed in such a way that the force distribution approximately follows the Goldstein optimum" In summary, the model requires thrust and torque forces for a given rotor e.g. rotor hub and tip diameters in order to be able to analyze the wake of the turbine. I am trying to verify the 3D vs axisymmetric results. For the axisymmetric simulations, wedge boundary condition was used. The reason for the comparison is to understand how wedge BC works according to the implementation. The results as below;

u velocity component;
1.jpg

v velocity component;
2.jpg

Normal force component;
3.jpg

As can be noticed, the normal force shows a very considerable deviation compared to the 3D simulations. I am trying to learn the reason of this discrepancy so that I can improve the model. I can post more details if needed. Also, you would appreciate any insight on the topic.

Thanks in advance,

Last edited by tareqkh; May 23, 2017 at 14:25.
tareqkh is offline   Reply With Quote

Old   May 29, 2017, 18:41
Default
  #2
Senior Member
 
tareqkh's Avatar
 
CFD
Join Date: Nov 2010
Location: United States
Posts: 243
Rep Power: 16
tareqkh is on a distinguished road
Anyone interested in the topic could provide me some hints?
tareqkh 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
Axisymmetric Boundary condition Mohit Singh SU2 3 July 15, 2015 09:19
Axisymmetric Whirl BCs; Wedge or Cyclic? c_dowd OpenFOAM Pre-Processing 4 December 5, 2012 10:38
Eulerian Granular FLow Axisymmetric vs Planar mesh meangreen FLUENT 1 November 9, 2010 12:37
Level set equation in axisymmetric 2-D flow jinwon park Main CFD Forum 0 February 26, 2008 16:26
axisymmetric model issue prc Siemens 4 February 7, 2007 06:42


All times are GMT -4. The time now is 01:40.