Moving workpiece instead of Heat source Problem

ahmmedshakil · April 11, 2013, 04:57

Hi
I'm facing a strange problem...I'm solving the equation below
dT/dt - v* dT/dx - (k/rho*Cp) (d2T/dx2+d2T/dy2+d2T/dz2) =0

v= welding speed
My intention is to instead of moving the heat source I want to move the work piece itself.
In OpenFOAM, I have modelled the equation like this:

TEqn.H
{
volVectorField gradT = fvc::grad(T);
volScalarField dtdx = gradT.component(0);
solve
(
fvm::ddt(T) - fvm::laplacian(DT, T) - VX*dtdx
)
}
For declaration of VX I have tried following both ways:
1. dimensionedScalarField
2. volVectorField and then taking X component of the velocity (VX)
But the problem is that, solution is acting like a fixed heat source...it's not moving....
Anyone can give me idea to work out this .....Thnx in advance

cpro · April 21, 2013, 00:17

Why are you multiplying the dT/dx term by a field? Does the welding speed vary with location? It seems that a dimensionedScalar would work if the welding speed in constant across the entire system (though not necessarily constant in time).

April 11, 2013, 04:57	Moving workpiece instead of Heat source Problem	#1
ahmmedshakil Senior Member Mohammad Shakil Ahmmed Join Date: Oct 2012 Location: AUS Posts: 137 Rep Power: 15	Hi I'm facing a strange problem...I'm solving the equation below dT/dt - v* dT/dx - (k/rhoCp) (d2T/dx2+d2T/dy2+d2T/dz2) =0 v= welding speed My intention is to instead of moving the heat source I want to move the work piece itself. In OpenFOAM, I have modelled the equation like this: TEqn.H { volVectorField gradT = fvc::grad(T); volScalarField dtdx = gradT.component(0); solve ( fvm::ddt(T) - fvm::laplacian(DT, T) - VXdtdx ) } For declaration of VX I have tried following both ways: 1. dimensionedScalarField 2. volVectorField and then taking X component of the velocity (VX) But the problem is that, solution is acting like a fixed heat source...it's not moving.... Anyone can give me idea to work out this .....Thnx in advance

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
How to model a moving heat source?	James	FLOW-3D	14	June 29, 2020 09:46
Heat source Inetsity (W/m3)-Moving	Sami.Sawalha	ANSYS	0	February 17, 2013 03:35
Problem with Mass source, Momentum source theory	diffo	Fluent UDF and Scheme Programming	0	August 20, 2009 07:10
Moving heat source (melt pool)	new_cfd_analyst	FLUENT	1	January 25, 2007 15:37
heat source problem	John	FLUENT	1	April 9, 2003 14:08

April 21, 2013, 00:17		#2
cpro New Member Chris Prohoda Join Date: Mar 2013 Posts: 6 Rep Power: 13	Why are you multiplying the dT/dx term by a field? Does the welding speed vary with location? It seems that a dimensionedScalar would work if the welding speed in constant across the entire system (though not necessarily constant in time).