# Add force (vary with time) onto a moving body

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

 November 9, 2015, 13:24 Add force (vary with time) onto a moving body #1 New Member   Yage Join Date: May 2014 Posts: 17 Rep Power: 3 Dear Forumers, I would like know how to generate a force vary with time. I would like to add it into 6DoFmotion solver, to allow a submerged body accelerate for then fully stop in the end. Is there any example or any similar code to study. Regards, Yage Last edited by Yage; November 9, 2015 at 14:59.

 November 10, 2015, 13:46 #2 Senior Member   Hassan Kassem Join Date: May 2010 Location: UK Posts: 149 Rep Power: 7 I believe your question is not clear enough. Because your question is self contradicting. The 6Dof motion is mainly solving the equation of motion based on the flow forces acting on immersed body. On the other hand, as I understand from your question, you wand to prescribe the motion. Is that true?

November 10, 2015, 14:00
#3
New Member

Yage
Join Date: May 2014
Posts: 17
Rep Power: 3
Quote:
 Originally Posted by hk318i I believe your question is not clear enough. Because your question is self contradicting. The 6Dof motion is mainly solving the equation of motion based on the flow forces acting on immersed body. On the other hand, as I understand from your question, you wand to prescribe the motion. Is that true?
Hi,

Sorry for the unclear question.

I would like to move the rigid body by a continuous force, like a paddle in water.

1. I found there is a "sixDoFRigidBodyMotionRestraint" function in "sixDoFRigidBodyMotion" and it can restrain the rigid body by a linear force, which vary with the rigid body position, I would like to know if I can do something based on that.
2. or a customized boundary condition?

Regards,
Yage

 November 10, 2015, 15:33 #4 Senior Member   Hassan Kassem Join Date: May 2010 Location: UK Posts: 149 Rep Power: 7 Hi, I believe you mean the linear spring restrain, generally restraints represents springs that is why they are function of position. But in this case the flow forces are integrated every time step and will effect the body motion, therefore obtaining a certain movement is not easy task. It is interaction problem.

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post joechorn Fluent UDF and Scheme Programming 5 April 2, 2015 11:25 Scabbard OpenFOAM Running, Solving & CFD 1 July 22, 2014 04:50 sharonyue OpenFOAM Running, Solving & CFD 13 January 2, 2013 23:40 Lord Kelvin OpenFOAM 6 April 12, 2011 11:24 lr103476 OpenFOAM Running, Solving & CFD 30 November 19, 2007 15:09

All times are GMT -4. The time now is 01:57.