Python Script Tutorial: ModelPart Elements and Conditions

The elements and conditions are the main extension points of the Kratos. In input script accessing them improves the flexibility in dealing with complex problems.

Starting

First of all we need to create a python file with following code to import the Kratos, create a ModelPart and read it from input as described in the here :

from KratosMultiphysics import *
import KratosMultiphysics.FluidDynamicsApplication

this_model = Model()
fluid_model_part = this_model.CreateModelPart("FluidPart")

fluid_model_part.AddNodalSolutionStepVariable(VELOCITY)
fluid_model_part.AddNodalSolutionStepVariable(PRESSURE)
fluid_model_part.AddNodalSolutionStepVariable(TEMPERATURE)

fluid_model_part_io = ModelPartIO("path/to/file/example")
fluid_model_part_io.ReadModelPart(fluid_model_part)

fluid_model_part.SetBufferSize(3)

Accessing Elements

The elements stored in the ModelPart can be accessed using the Elements parameter:

model_part_elements = fluid_model_part.Elements

Iteration over all elements in a model part is very similar to the nodes. For example writing the elements in a model part can be done as follow:

for element in fluid_model_part.Elements:
    print(element)

and printing the ID for all of the elements:

for element in fluid_model_part.Elements:
    print(element.Id)

Accessing Conditions

Conditions parameter of model part provides access to the conditions it stores:

model_part_conditions = fluid_model_part.Conditions

Iteration over conditions is very similar to the elements. In the same way printing conditions is as follow:

for condition in fluid_model_part.Conditions:
    print(condition)

and printing the ID for all of the conditions:

for condition in fluid_model_part.Conditions:
    print(condition.Id)

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