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

Drag Coefficient depending on the Reynolds' number.

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 4, 2012, 05:48
Default Drag Coefficient depending on the Reynolds' number.
  #1
New Member
 
Join Date: Oct 2012
Posts: 1
Rep Power: 0
rtech is on a distinguished road
Hello,

I'm trying to found a numerical model that represents approximately the following experimental curve :

As you can see, it represents the drag coefficient depending on the Reynolds' number in the case of a sphere. Thereby, I use very high Reynolds' number, from 10⁴ to 10⁷. Unfortunately, I can get “right” drag coefficients. I'm using the simpleFoam solver supposing that my fluid is incompressible of course. I've tried to use the “SpalartAllmaras” RASmodel and the “k0megaSST” one. For example, for the k0mega, I've got those coefficients :


Re=10⁴ → Cd=0.401791
Re=10⁵ → Cd=0.224801
Re=3.10⁵ → Cd=0.168429
Re=5.10⁵ → Cd=0.154445
Re=2.10⁶ → Cd=0.090002
Re=10⁷ → Cd=0.0672258


I just want to know if anyone has an idea of what should I do to get my drag coefficients not far from the experimental ones. Maybe someone has been already confronted to that case...


Thank you.
rtech 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
drag coefficient in ansys fluent 12.0 krishna FLUENT 18 May 2, 2013 13:29
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
Reynolds Number and Heat transfer Coefficient panos_metal FLUENT 0 January 7, 2011 07:37
Solidification drag coefficient atulverma FLOW-3D 1 May 14, 2009 09:24


All times are GMT -4. The time now is 21:52.