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am pathgen command

Syntax:

am pathgen outfile "filename" num_layers "N" zstart "Z" width_haz "H" melt_depth D depth_haz  

Examples:

Taken from examples/stitch/stitching_rectangular_domain.

###################################
# Variables defined for convenience
# WIDTH_HAZ
variable WIDTH_HAZ equal 13
#
# MELT_DEPTH
variable MELT_DEPTH equal 4
#
# DEPTH_HAZ
variable DEPTH_HAZ equal 5
#
# V: scan speed
variable V equal 14.0
#
# HATCH: hatch spacing
variable HATCH equal 5.0
#
# LAYER_THICKNESS: 
variable LAYER_THICKNESS equal 3
#
# OUT: output filename
variable OUT world pathgen.dat
################################### 
########################################################
# This example uses the following larger intended domain
region       box block  0 100 0 280 0 48
######################################################## 
#############################################################
# Additional commands defining hatch pattern, cartesian layers, etc
am pass 1 dir X speed $V hatch $HATCH
am pass 2 dir Y speed $V hatch $HATCH
am cartesian_layer 1 start LL pass_id 1 thickness $LAYER_THICKNESS offset -80.0 0.0 serpentine 1
am cartesian_layer 2 start UL pass_id 2 thickness $LAYER_THICKNESS offset 0.0 80.0 serpentine 1
am cartesian_layer 3 start UR pass_id 1 thickness $LAYER_THICKNESS offset 80.0 0.0 serpentine 1
am cartesian_layer 4 start LR pass_id 2 thickness $LAYER_THICKNESS offset 0.0 -80.0 serpentine 1
############################################################# 
Example 1:
pathgen outfile $OUT num_layers 6 zstart 0 width_haz $WIDTH_HAZ melt_depth $MELT_DEPTH depth_haz $DEPTH_HAZ 

Description:

This command is used by potts/am/path/gen for auto generation of path information on rectangular layers. Output from this command can be used to assemble very large simulations of AM microstructures using a sequence of significantly smaller simulations. The sequence of smaller simulations are conducted on a series of CVs calculated using SPPARKS on the basis of the larger intended domain size as specified using the standard region command.

The outfile parameter specifies name of file where path information is written. This file is subsequently read line by line using a python or bash script to orchestrate the ordered series of smaller simulations.

num_layers parameter specifies how many layers output path information will be generated for. This parameter allows for re-use of layer specifications and implicitly creates a pattern of layers. The build pattern is implied by the order and number of layers in the input script; if num_layers is greater than number of cartesian layers provided in script then the input cartesian layers are used as a pattern repeated as necessary to create number of layers. Once path information has been generated for all layers specified, the pattern repeats, cycling through the layers again and again until num_layers have been processed.

As is conventional, the build proceeds in the z-direction according to specified layer thicknesses. The zstart parameter specifies starting z elevation of build plane surface.

On the basis of specified am pass and heat effected zone parameters, a sequence of computational volumes (CV) are created. The width_haz parameter sizes the width of the CV; the length of the CV is collected from am pass and domain size information while depth of the CV is specified with the depth_haz parameter. Microstructure simulations are conducted on the smaller incremental sequence of CVs. The depth_haz parameter only makes sense when its greater than melt_depth. The melt_depth parameter is not used directly by the path generator but is passed on to the AM model for simulating microstructures; for convenience it is included here to allow for parametric studies on melt_depth and depth_haz.

Restrictions:

This command is only used by the potts/am/path/gen app in conjunction with the region, create_box, am pass, and am cartesian_layer, commands. If the am pathgen command is missing, the potts/am/path/gen app will run but path information will not be generated.

Related commands:

potts/am/path/gen region create_box am_pass am_cartesian_layer

Default:

None