initial Conditions as Point Forces

bucsfan221 · October 13, 2011, 02:01

Hello! I am trying to model point forces in a box of fluid (i.e. set 6 points or nodal points to specific force values) but I haven't been able to figure out how to do this, as initial or boundary values. Is this possible to do?

Thanks!

nimasam · October 13, 2011, 15:53

you should be more specific , which solver?, whats the nature of forces? , is it just in time zero or it should be fulfill in the whole time? and where you want to apply the force (internal Fields or Boundary condition)?

your post is completely general!

bucsfan221 · October 13, 2011, 16:08

So in terms of what I am trying to do, I am trying to simulate a box of fluid with internal point forces (I'm not really interested in time-dependent conditions on the domain's boundary). At the moment I am trying to use icoFoam to do this (I'm new to openFoam, and the cavity tutorial seemed like the easiest way to go about this).

I would like to specify these forces as an internal field, but at points (0,0,1), (0,0,-1), (1,0,0),(-1,0,0), (0,1,0), and (0,-1,0) at time t=0. Then, I would like to change these locations with each deltaT and compute the new flow-field.

October 13, 2011, 02:01	initial Conditions as Point Forces	#1
bucsfan221 New Member Join Date: Oct 2011 Posts: 3 Rep Power: 16	Hello! I am trying to model point forces in a box of fluid (i.e. set 6 points or nodal points to specific force values) but I haven't been able to figure out how to do this, as initial or boundary values. Is this possible to do? Thanks!

October 13, 2011, 16:08	Sorry!	#3
bucsfan221 New Member Join Date: Oct 2011 Posts: 3 Rep Power: 16	So in terms of what I am trying to do, I am trying to simulate a box of fluid with internal point forces (I'm not really interested in time-dependent conditions on the domain's boundary). At the moment I am trying to use icoFoam to do this (I'm new to openFoam, and the cavity tutorial seemed like the easiest way to go about this). I would like to specify these forces as an internal field, but at points (0,0,1), (0,0,-1), (1,0,0),(-1,0,0), (0,1,0), and (0,-1,0) at time t=0. Then, I would like to change these locations with each deltaT and compute the new flow-field.

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October 13, 2011, 15:53		#2
nimasam Senior Member Nima Samkhaniani Join Date: Sep 2009 Location: Tehran, Iran Posts: 1,269 Blog Entries: 1 Rep Power: 26	you should be more specific , which solver?, whats the nature of forces? , is it just in time zero or it should be fulfill in the whole time? and where you want to apply the force (internal Fields or Boundary condition)? your post is completely general!