CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

Extracting Drag Force

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 24, 2019, 09:56
Smile Extracting Drag Force
  #1
New Member
 
Hamish Blair
Join Date: Jul 2019
Posts: 1
Rep Power: 0
mishblair is on a distinguished road
Hello all,

I am currently simulating 2 Ahmed bodies in 2D travelling in a platoon. My aim is to extract a drag force from each vehicle in the platoon and calculate the drag co-efficient and compare the results at different inter-vehicle distances and speeds.

I have calculated the drag co-efficient of a single Ahmed body to be 0.36 using the function calculator in Post to calculate the force in the X direction and then calculate the co-efficient myself.
When I have simulated 2 bodies in platoon I have been getting a negative force for the lead vehicle and and positive larger force for the trailing vehicle. I checked the pressure and velocity contours and I couldn't see anything wrong with them. I have attached some screenshots to show both contours along with the drag force the function calculator is giving me

If anyone could suggest a way to fix this or explain what I have done is wrong that would be extremely helpful
Attached Images
File Type: png Pressure Contour with force.png (155.1 KB, 9 views)
File Type: png Pressure Contour with drag force 2.png (155.1 KB, 7 views)
File Type: png Velocity Contour.png (174.5 KB, 7 views)
mishblair is offline   Reply With Quote

Reply

Tags
ahmed, ahmed body fluent drag cd, drag coefficient, drag force

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
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 11:12
udf for compute pressure drag force fatemi Fluent UDF and Scheme Programming 1 January 26, 2018 13:27
Force can not converge colopolo CFX 13 October 4, 2011 22:03
Force vectors for drag during sweeping motion aamer FLUENT 0 April 18, 2011 08:17
formula used for drag force? kamma Main CFD Forum 0 April 2, 2010 10:21


All times are GMT -4. The time now is 04:36.