Maxwell 2D: resistance calculation

This example uses PyAEDT to set up a resistance calculation and solve it using the Maxwell 2D DCConduction solver. Keywords: DXF import, material sweep, expression cache

import os.path

import pyaedt

Launch AEDT and Maxwell 2D

Launch AEDT and Maxwell 2D after first setting up the project and design names, the solver, and the version. The following code also creates an instance of the Maxwell2d class named m2d.

m2d = pyaedt.Maxwell2d(
    specified_version="2023.2",
    new_desktop_session=True,
    close_on_exit=True,
    solution_type="DCConduction",
    designname="Ansys_resistor"
)

Initializing new desktop!

Import geometry as a DXF file

You can test importing a DXF or a Parasolid file by commenting/uncommenting the following lines. Importing DXF files only works in graphical mode.

# DXFPath = pyaedt.downloads.download_file("dxf", "Ansys_logo_2D.dxf")
# dxf_layers = m2d.get_dxf_layers(DXFPath)
# m2d.import_dxf(DXFPath, dxf_layers, scale=1E-05)
ParasolidPath = pyaedt.downloads.download_file("x_t", "Ansys_logo_2D.x_t")
m2d.modeler.import_3d_cad(ParasolidPath)

True

Define variables

Define conductor thickness in z-direction, material array with 4 materials, and MaterialIndex referring to the material array

m2d["MaterialThickness"] = "5mm"
m2d["ConductorMaterial"] = "[\"Copper\", \"Aluminum\", \"silver\", \"gold\"]"
MaterialIndex = 0
m2d["MaterialIndex"] = str(MaterialIndex)
no_materials = 4

Assign materials

Voltage ports will be defined as perfect electric conductor (pec), conductor gets the material defined by the 0th entry of the material array

m2d.assign_material(["ANSYS_LOGO_2D_1", "ANSYS_LOGO_2D_2"], "pec")
m2d.modeler["ANSYS_LOGO_2D_3"].material_name = "ConductorMaterial[MaterialIndex]"

Assign voltages

1V and 0V

m2d.assign_voltage(["ANSYS_LOGO_2D_1"], amplitude=1, name="1V")
m2d.assign_voltage(["ANSYS_LOGO_2D_2"], amplitude=0, name="0V")

<pyaedt.modules.Boundary.BoundaryObject object at 0x000001D983FF2230>

Setup conductance calculation

1V is the source, 0V ground

m2d.assign_matrix(sources=['1V'], group_sources=['0V'], matrix_name="Matrix1")

<pyaedt.modules.Boundary.MaxwellParameters object at 0x000001D983FF01F0>

Assign mesh operation

3mm on the conductor

m2d.mesh.assign_length_mesh(["ANSYS_LOGO_2D_3"], meshop_name="conductor", maxlength=3, maxel=None)

<pyaedt.modules.Mesh.MeshOperation object at 0x000001D983FF0340>

Create simulation setup and enable expression cache

Create simulation setup with minimum 4 adaptive passes to ensure convergence. Enable expression cache to observe the convergence.

setup1 = m2d.create_setup(setupname="Setup1", MinimumPasses=4)
setup1.enable_expression_cache( # doesn't work?
    report_type="DCConduction",
    expressions="1/Matrix1.G(1V,1V)/MaterialThickness",
    isconvergence=True,
    conv_criteria=1,
    use_cache_for_freq=False)
setup1.analyze()

Create parametric sweep

Create parametric sweep to sweep all the entries in the material array. Save fields and mesh and use the mesh for all the materials.

param_sweep = m2d.parametrics.add(
    "MaterialIndex", 0, no_materials-1, 1, "LinearStep",
    parametricname="MaterialSweep")
param_sweep["SaveFields"] = True
param_sweep["CopyMesh"] = True
param_sweep["SolveWithCopiedMeshOnly"] = True
param_sweep.analyze()

True

Create resistance report

Create R. vs. material report

variations = {"MaterialIndex": ["All"], "MaterialThickness": ["Nominal"]}
report = m2d.post.create_report(
    expressions="1/Matrix1.G(1V,1V)/MaterialThickness",
    primary_sweep_variable="MaterialIndex",
    report_category="DCConduction",
    plot_type="Data Table",
    variations=variations,
    plotname="Resistance vs. Material",
)
d = report.get_solution_data()
d.primary_sweep = "MaterialIndex"
d.plot()

<Figure size 2000x1000 with 1 Axes>

Field overlay

Plot electric field and current density on the conductor surface

conductor_surface = m2d.modeler["ANSYS_LOGO_2D_3"].faces
m2d.post.create_fieldplot_surface(conductor_surface, "Mag_E", plot_name="Electric Field")
m2d.post.create_fieldplot_surface(conductor_surface, "Mag_J", plot_name="Current Density")

<pyaedt.modules.solutions.FieldPlot object at 0x000001D983FF1960>

Field overlay

Plot electric field using pyvista and saving to an image

py_vista_plot = m2d.post.plot_field("Mag_E", conductor_surface, plot_cad_objs=False, show=False)
py_vista_plot.isometric_view = False
py_vista_plot.camera_position = [0, 0, 7]
py_vista_plot.focal_point = [0, 0, 0]
py_vista_plot.roll_angle = 0
py_vista_plot.elevation_angle = 0
py_vista_plot.azimuth_angle = 0
py_vista_plot.plot(os.path.join(m2d.working_directory, "Image.jpg"))

True

Field animation

Plot current density vs the Material index.

animated = m2d.post.plot_animated_field(
    quantity="Mag_J",
    object_list=conductor_surface,
    export_path=m2d.working_directory,
    variation_variable="MaterialIndex",
    variation_list=[0,1,2,3],
    show=False,
    export_gif=False,
    log_scale=True,
)
animated.isometric_view = False
animated.camera_position = [0, 0, 7]
animated.focal_point = [0, 0, 0]
animated.roll_angle = 0
animated.elevation_angle = 0
animated.azimuth_angle = 0
animated.animate()

True

Release desktop

m2d.release_desktop()

True