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

higher drag coefficient value

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 8, 2013, 22:47
Default higher drag coefficient value
  #1
Member
 
Kai Zhang
Join Date: Jan 2013
Location: yokohama, Japan
Posts: 83
Rep Power: 4
kkpal is on a distinguished road
hi everyone.

I've been doing simulations about flow around a circular cylinder at Re=100 recently. The problem is that no matter how I change my mesh fineness, my Cd value is always higher than the accurate one, which is about 1.33.

I used air density rho=1.225 and kinematic viscosity nu=1.5e-5. As Re=100 is in the laminar regime, I didn't use any turbulence model. I've changed my mesh many time, hoping that with the refinement of mesh, the drag coefficient would be more accurate. However, the Cd value I'm keep obtaining is always well above 1.4.

here I post my case file.
http://www.mediafire.com/?3p1lipc9ttae8py
would some one help me out of this?
thanks in advance!

Last edited by kkpal; May 8, 2013 at 23:11.
kkpal is offline   Reply With Quote

Reply

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
problem with saving drag coefficient colopolo FLUENT 5 April 12, 2013 10:59
Incorrect Drag and Drag Coefficient for flow over a cylinder ozzythewise Main CFD Forum 8 June 13, 2012 06:24
Calculation of Drag Coefficient, Help Please teek22 CFX 1 April 26, 2012 18:41
Drag Coefficient Convergence Problem John FLUENT 16 September 4, 2009 02:44
Automotive test case vinz OpenFOAM Running, Solving & CFD 98 October 27, 2008 09:43


All times are GMT -4. The time now is 09:43.