MPM Json Output process
The MPMJsonOutputProcess exports the values of variables associated with material point elements in JSON format.
MPMJsonOutputProcess behaves like an output process and is discussed in the output processes section, it must be included in the "processes" section of the ProjectParameters.json input file, not in the "output_processes" section. This requirement arises because the process extends the KratosMultiphysics.JsonOutputProcess class, which in turns extends KratosMultiphysics.Process rather than KratosMultiphysics.OutputProcess.Parameters & Defaults
{
"kratos_module" : "KratosMultiphysics.MPMApplication",
"python_module" : "mpm_json_output_process",
"Parameters" : {
"model_part_name" : "",
"sub_model_part_name" : "",
"output_file_name" : "",
"gauss_points_output_variables" : [],
"check_for_flag" : "",
"time_frequency" : 1.00,
"resultant_solution" : false
}
}
model_part_name
String identifying the name of the target ModelPart.
sub_model_part_name
String identifying the name of the target SubModelPart. If not present, the whole ModelPart will be the target.
output_file_name
Name of the output file.
gauss_points_output_variables
List of variables associated to material point elements (e.g., MP_MASS, MP_DISPLACEMENT, MP_VELOCITY, …) to be printed.
check_for_flag
A string specifying a Flag variable implemented in Kratos. The process
evaluates this flag for each material point element and exports the requested
data only if the flag is set to true. This parameter is optional; if no flag
is provided, data for all material points will be exported.
time_frequency
Defines the time interval for writing data to the file, thus determining how frequently the simulation outputs are exported.
resultant_solution
Determines how the requested variables are output for material point elements
with the check_for_flag condition set to true. If false, the process writes
the values of the variables separately for each material point element. If
true, the process calculates and writes, at each time step, the sum of the
variable values across all material points that meet the check_for_flag
condition.
Example. When set to true, the output has the form
{
"TIME" : [
0.1,
0.2,
0.3
],
"RESULTANT" : {
"MP_MASS" : [
10.0, // sum of variable MP_MASS among all the material point elements at time 0.1
10.0,
10.0
]
}
}
When set to false, the output has the form
{
"TIME" : [
0.1,
0.2,
0.3
],
"MP_1" : {
"MP_MASS" : [
3.0, // value of variable MP_MASS at time 0.1 for material point elemenent with Id 1
3.0,
3.0
]
},
"MP_2" : {
"MP_MASS" : [
5.0,
5.0,
5.0
]
},
"MP_3" : {
"MP_MASS" : [
2.0,
2.0,
2.0
]
}
}