CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > CFX

Force function gives a negative value.

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

LinkBack Thread Tools Display Modes
Old   November 29, 2017, 03:02
Default Force function gives a negative value.
New Member
Eric Lee
Join Date: Jul 2017
Posts: 10
Rep Power: 3
kyo022 is on a distinguished road

I'd like to ask what is wrong with my CFD result on CFD-Post, since I keep getting negative values when I try to calculate the force applied on the body to obtain the drag force.

I believe I've tried different boundary conditions for several times, and the mesh quality looks okay according to the value of the skewness.

The details are shown in the attached picture.

I would appreciate if anyone advise on this.

Have a great day.

Attached Images
File Type: jpg ??.jpg (50.2 KB, 8 views)
kyo022 is offline   Reply With Quote

Old   November 29, 2017, 09:52
Senior Member
JuPa's Avatar
Join Date: Jun 2012
Location: Britain
Posts: 353
Rep Power: 9
JuPa is on a distinguished road
The negative sign is showing direction with respect to your coordinate frame.

Force is a vector. It can be positive or negative.

In your case it is 1.13 N in the negative x direction.
JuPa 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
ActuatorDiskExplicitForce in OF2.1. Help be_inspired OpenFOAM Programming & Development 10 September 14, 2018 12:12
is internalField(U) equivalent to zeroGradient? immortality OpenFOAM Running, Solving & CFD 7 March 29, 2013 02:27
error message with modeling a cube with a hold at the center hsingtzu OpenFOAM Native Meshers: blockMesh 2 March 14, 2012 10:56
latest OpenFOAM-1.6.x from git failed to compile phsieh2005 OpenFOAM Bugs 25 February 9, 2010 05:37
Version 15 on Mac OS X gschaider OpenFOAM Installation 113 December 2, 2009 11:23

All times are GMT -4. The time now is 07:30.