CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

Problem with drag coefficient calculation

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

LinkBack Thread Tools Display Modes
Old   June 12, 2009, 14:14
Default Problem with drag coefficient calculation
New Member
Join Date: Jun 2009
Posts: 10
Rep Power: 10
Crystal is on a distinguished road

I'm quite new to Fluent and lately I've been facing a rather strange problem relating to drag coefficient calculation. I'm trying to simulate external flow over a sphere at Re = 100, 300 and 1.1 X 10^6. My problem is: when I select air as my fluid, my results closely matches the reported values. However, when I select water as my fluid, my results are totally off, and the values are close to zero.
I've checked that I've keyed in the corresponding velocities correctly. I even tried changing the dimensions of the sphere and running on double precision solver to ensure it is not caused by limit in precision. But to no avail.
What could be the problem? Would really appreciate any help on this!
Crystal is offline   Reply With Quote


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
Fluent Good Lift coefficient BAD drag coefficient Rif Main CFD Forum 4 March 9, 2010 11:52
UDF of two phase flow : drag coefficient superxeonman FLUENT 0 May 21, 2008 21:53
Plot drag coefficient against Y(distance) edwin FLUENT 0 February 4, 2008 10:41
Need urgent help Regarding Drag coefficient srinivas FLUENT 3 September 20, 2006 10:10
Need urgent help Regarding Drag coefficient srinivas FLUENT 0 September 16, 2006 12:25

All times are GMT -4. The time now is 19:14.