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Laser Thermal Models: Prismatic and Cylindrical

Neil S. Bailey

June 23, 2017

Purdue University : Center for Laser-based Manufacturing

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Prismatic and Cylindrical

Purdue University : Center for Laser-based Manufacturing

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Prismatic Model LAMLGUI Prismatic geometry Finite volume method Orthogonal non-uniform mesh Multiple laser profile options Multiple temperature output options Optional features:

Machining with material removal

1D complex geometry along surface

Impinging gas jet Temperature dependent

conductivity and specific heat

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Prismatic Model Parameters

Overall Parameters

Tool and Jet

Material Property

Workpiece Mesh

Laser Parameters

Temperature Tracking

Complex Geometry

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Prismatic Model Overall parameters

Machining or heating only

Simulation time parameters

Initial temperatures

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Prismatic Model Tool and Jet Parameters

Machining:

Tool diameter

laser lead

Impinging jet:

Jet properties

Gas properties

Natural convection coefficient

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Material Properties Density

Emissivity

Reflectivity

Conductivity

Specific heat

Temperature dependent properties are represented by up to 4 polynomials of 5th order.

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Work piece and mesh

Orthogonal mesh

All cells are rectangular, no angles.

Non-uniform mesh

Cell sizes are uniform in fine mesh area, non-uniform outside fine mesh area.

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Laser Parameters

3 laser profiles: Gaussian (most)

Circular (controlled by a 9th order polynomial)

Rectangular (HPDL or non-orthogonal incident angle)

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Temperature tracking

3D domain, 2D surface, point tracking

Cross sections (YZ or XZ) with animations

Slices for 2D steel kinetic model

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Complex geometry parameters

Y, Z coordinates define complex geometry surface profile along X direction.

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Prismatic Model Input files LAML_parameter.dat main parameter file specify_points.dat used if more than 11 points need to be tracked Output files Open with Tecplot

surface#.dat 2D surface plot 3D_surface_movie.dat 3D surface file showing complex geometry temp3D#.dat 3D domain plot mesh.dat 3D file showing mesh Temperature history of point #.dat x,y plot of single points xz_slice#.dat and yz_slice#.dat Cross-section plots

Other files log.dat iterations and time step data stat#.dat time steps, max temperature, machining data T_restart.dat temperature file saved at the end of each simulation that

can be used to start x_coordinate.dat coordinates of the cell volumes Tmsteps.dat used with steel kinetic model Folders: xz1, xz2, yz1, etc. used with steel kinetic model

Folders must be present for model to run!

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Prismatic Model Useful facts Runs on single core Use MySave, not save icon. Use Windows task manager to kill jobs. Some output files can be used as animation in Tecplot: Animate, Zones

3D_surface_movie.dat, Flux.dat

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Cylindrical Model LAMLGUI Cylindrical geometry Finite volume method Orthogonal non-uniform mesh Up to 2 lasers with multiple

laser profile options Multiple temperature output

options Optional features:

Machining with material removal

1D complex geometry for facing and turning

Impinging gas jet Temperature dependent

conductivity and specific heat

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Cylindrical Model Parameters -> Operating

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Cylindrical Model Parameters -> Workpiece

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Cylindrical Model Parameters -> Model Control

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Cylindrical Model

parameters

Machin

Parameters -> BC Conditions

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Cylindrical Model Input files anyname.LAM main parameter file complex#.dat used to define complex geometry Output files Open with Tecplot

surface#.dat 2D surface plot ThreeD#.dat 3D domain plot t_slice#.dat Cross-section plots

Other files log.dat iterations and time step data stats.dat time steps, max temperature, machining data stp.dat temperature at specified points xu.dat, yv.dat, zw.dat coordinates of the cell volumes

Users Manual

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Prismatic and Cylindrical

Questions?

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