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app_style potts/am/weld command

Syntax:

app_style style nspins alpha beta haz

  • style = potts/am/weld
  • nspins = number of possible Potts model spins
  • alpha = controls relative size of melt pool shape at bottom compared to top
  • beta = Bezier control point parameter that defines curvature of melt pool shape through thickness
  • haz = width of the heat affected zone (haz) surrounding the melt pool

    Examples:

    app_style potts/am/weld 10000 0.5 0.75 50.0
    weld_shape_ellipse 100.0 150.0 
    

    The app_style potts/am/weld command uses a subset of the command parameters used by app_style potts/weld -- additional explanation provided below. For an explanation of the above commands and parameters, see potts/weld example. This application requires melt pool geometry commands -- per example above and explanation below.

    This application requires rastering commands -- per explanation given below.

    The pulse command is disabled in this application.

    Description:

    This is an application for 2D additive manufacturing simulations and is an adaptation of potts/weld; it can be viewed as a potts/weld model with rastering commands as defined and used by potts_additive. The 2D limitation of this app derives from the full penetration weld assumption; potts/weld; does not have a melt pool bottom that naturally occurs in an additive manufacturing build the z-direction. Thickness of the lattice in the z-direction is taken as the plate thickness per description in the potts/weld; such simulations will produce meaningful 3D microstructures. However, it is generally more efficient to run 2D calculations with this app using only one plane of lattice sites.

    Application potts/am/weld command values are all associated with potts/weld and have identical interpretations/meanings for potts/am/weld. Some values, e.g. yp,velocity, used in potts/weld, have been moved to raster commands.

    The following commands must be used to specify pool geometry:

    weld_shape_ellipse specify elliptical pool shape parameters
    weld_shape_teardrop specify teardrop pool shape parameters

    The following additional commands are typically used by this application. A layer must be defined: one of am cartesian_layer or am path_layer. A layer requires 1 to many am path or at least 1 am pass. Since this application only runs 1 layer, the am build command described below is optional.

    am pass: Specify pass parameters used to construct cartesian_layer.

    am path: Specify arbitrary paths via start/end points on a layer; sequence of am paths are used to construct an am path_layer.

    am cartesian_layer: A scan pattern on rectangular layer constructed from am pass and other parameters.

    am build: May be used to combinations of layers that comprise a pattern.

    NOTE: Because potts/am/weld is intended for 2D simulations, only the first layer, as specified in the am build command, is used; this application does not simulate multilayer builds. The examples/potts_additive directory has input files which illustrate how to use the rastering commands.

    The temperature command should be used to set simulation Monte Carlo temperature.


    Restrictions:

    This application is only compatible with square and square cubic lattices. It can only be evolved by a rejection KMC (rKMC) algorithm. See sweep for more information.

    Additional related commands:

    app_style potts, app_style potts/grad, app_style potts/additive, app_style potts/weld,

    Default: