CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Flow forces

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

LinkBack Thread Tools Display Modes
Old   August 18, 2013, 20:59
Question Flow forces
New Member
Join Date: Aug 2013
Posts: 10
Rep Power: 6
Tunlu is on a distinguished road
Hi, Everybody !

I would like to request to share me your knowledge !
I am working on flow force acting on a suspended bar by using Fluent.
The flow is perpendicularly targeted (let say Z direction) on a surface of the bar (let say X-Y plane) . I got the results ! When I extracted the flow force acting on that surface in Z direction, there was viscous force.
I would like to know Why? Thank you very much.

Tunlu is offline   Reply With Quote

Old   August 19, 2013, 02:15
Senior Member
flotus1's Avatar
Join Date: Jun 2012
Location: Germany
Posts: 1,615
Rep Power: 26
flotus1 will become famous soon enoughflotus1 will become famous soon enough
How high is the contribution of shear forces to the total force?
Are you sure that it is not just a numerical artifact caused by the fact that the normal vector of the face (especially the normal vectors of the cell faces) are never identical with the z-direction?
flotus1 is offline   Reply With Quote

Old   August 20, 2013, 07:01
New Member
Join Date: Aug 2013
Posts: 10
Rep Power: 6
Tunlu is on a distinguished road
Yes, Flotus1

The percentage of viscous force is about 0.2%. But, I like to see it as totally zero. It may be because of the fact that you said. Normal vector of faces of some element are not identical to the Z axis. Thus, viscous forces on that surface produce components in Z-axis. Right? So, we should not take account that viscous force, Right? Thank you very much, Flotus1.

Tunlu 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
mass flow inlet and pressure outlet with target mass flow rate Zigainer FLUENT 10 January 5, 2013 22:51
transient, impregnating flow problem fgommer FLUENT 0 February 29, 2012 17:10
Non-steady flow simplified for use in Vissim steamerandy Main CFD Forum 0 October 31, 2011 22:08
Fully Developed Flow in Star-cd SMM STAR-CD 0 September 5, 2011 22:08
Flow meter Design CD adapco Group Marketing Siemens 3 June 21, 2011 08:33

All times are GMT -4. The time now is 09:19.