openfoam in welding applications - chalmershani/ofgbg12/slides/alirezajavidi.pdfopenfoam in welding...
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OpenFOAM in Welding applications
Gothenburg Region OpenFOAM User Group Meeting, November 14th, 2012
Alireza Javidi1
1University West, Department of Engineering Science, Trollhättan
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1. Arc2. Energy coupling between solid and fluid3. Arc and coupling4. Melting and phase change
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Sketch of the cross section of a TIG torch
Tungsten Inert Gas welding
Picture of a TIG torch
Ar shielding gas inlet
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Governing equations: thermal fluid part
•(Steady) continuity equation
0 u(T)
•(Steady) momentum conservation equation
hTuhhu )( (T)(T)
BJPIuTuuT T
)(
32)()(
•(Steady) enthalpy conservation equation
uuuu (T)(T)
h
TeCJkTQEJuPPu
p
Brad )(2
5)(
Joule heatingTransport ofelectron enthalpy
Lorentz force
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Governing equations: electromagnetic part
Electric potential :
with:
VE
V)( TJ
0)( VT
: current densityJ
)(T : electric conductivity
Magnetic potential :A
V
with:
VTA 02 )(
AB
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Argon plasma density as function of temperature.
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Specific heat as function of temperature
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Argon plasma electric conductivity as function of temperature
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Ar shielding gas inlet
CathodeTip
Cathodea
ABCathodea
BCAnode Nozzle Inlet Outlet
u 0 0 0 0 0 parabolic
h or T 20000K Linearb linearb linearc 0 300K 0
V or J 0 0 0 0
A
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Temperature along the radial direction, 1 mm above the anode
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chtMultiRegionFoam
The solver is based on combination of heatConductionFoam and buoyantFoamfor conjugate heat transfer between a solid region and fluid region.
“0”“topAir”
“U”“T”“p”
“bottomSolid”“cp” “K”“T”“rho”
“constant”regionProperties“topAir”
“polyMesh”thermophysicalPropertiesg
“bottomSolid”“polyMesh”
“system”controlDict“topAir”
fvSystemfvSolution
“bottomSolid” fvSystemfvSolution
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= ∑
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1. Energy balance at cathode/sheath interface2. Energy balance at sheath/presheath interface3. Current density conservation