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DOC: update documentation b44b500 
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‎CNAME‎

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workflows.docs.pyansys.com

‎_downloads/0a558143ee4cb586897ad4681c808fd3/wf_gmd_02_mechanical.ipynb‎

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{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"\n\n# Mechanical - Thermal analysis\n\nThis examples performs meshing, steady-state and transient thermal analysis of PCB.\nObjective of this example is to study or examine resulting temperatures caused by\nthe heat developed in chips.\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"import os\nfrom pathlib import Path\n\nimport ansys.mechanical.core as mech\nfrom matplotlib import image as mpimg\nfrom matplotlib import pyplot as plt"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Parameters for the script\nThe following parameters are used to control the script execution. You can\nmodify these parameters to suit your needs.\n\n\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"GRAPHICS_BOOL = False # Set to True to display the graphics\nOUTPUT_DIR = Path(Path(__file__).parent, \"outputs\") # Output directory"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Start a PyMechanical app\n\n\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"app = mech.App()\napp.update_globals(globals())\nprint(app)\n\n\ndef display_image(image_name):\n plt.figure(figsize=(16, 9))\n plt.imshow(mpimg.imread(os.path.join(OUTPUT_DIR, image_name)))\n plt.xticks([])\n plt.yticks([])\n plt.axis(\"off\")\n plt.show()"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Configure graphics for image export\n\n\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"ExtAPI.Graphics.Camera.SetSpecificViewOrientation(ViewOrientationType.Iso)\nExtAPI.Graphics.Camera.SetFit()\nimage_export_format = GraphicsImageExportFormat.PNG\nsettings_720p = Ansys.Mechanical.Graphics.GraphicsImageExportSettings()\nsettings_720p.Resolution = GraphicsResolutionType.EnhancedResolution\nsettings_720p.Background = GraphicsBackgroundType.White\nsettings_720p.Width = 1280\nsettings_720p.Height = 720\nsettings_720p.CurrentGraphicsDisplay = False"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Import geometry\nImport geometry which is generated with pyansys-geometry\n\n\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"geometry_path = Path(OUTPUT_DIR, \"pcb.pmdb\")\ngeometry_import_group = Model.GeometryImportGroup\ngeometry_import = geometry_import_group.AddGeometryImport()\ngeometry_import_format = Ansys.Mechanical.DataModel.Enums.GeometryImportPreference.Format.Automatic\ngeometry_import_preferences = Ansys.ACT.Mechanical.Utilities.GeometryImportPreferences()\ngeometry_import_preferences.ProcessNamedSelections = True\ngeometry_import.Import(str(geometry_path), geometry_import_format, geometry_import_preferences)\n\n# Plot geometry\nif GRAPHICS_BOOL:\n app.plot()"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Create named selections\n\n\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"ExtAPI.Application.ActiveUnitSystem = MechanicalUnitSystem.StandardMKS\n\n# Create named selection for all bodies\nbodies = Model.Geometry.GetChildren(DataModelObjectCategory.Body, True)\nbody_ids = [bd.GetGeoBody().Id for bd in bodies]\nselection = ExtAPI.SelectionManager.CreateSelectionInfo(SelectionTypeEnum.GeometryEntities)\nselection.Ids = body_ids\nns1 = Model.AddNamedSelection()\nns1.Name = \"all_bodies\"\nns1.Location = selection\n\n# Create named selection for all except substrate\nsubstrate_id = [bd.GetGeoBody().Id for bd in bodies if bd.Name.endswith(\"substrate\")]\nexcept_substrate_id = list(set(body_ids) - set(substrate_id))\n\nselection = ExtAPI.SelectionManager.CreateSelectionInfo(SelectionTypeEnum.GeometryEntities)\nselection.Ids = except_substrate_id\nns2 = Model.AddNamedSelection()\nns2.Name = \"all_except_board\"\nns2.Location = selection"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Meshing\n\n\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"mesh = Model.Mesh\nmesh.GenerateMesh()\n\n# Export mesh image\nExtAPI.Graphics.Camera.SetFit()\nExtAPI.Graphics.ExportImage(\n os.path.join(OUTPUT_DIR, \"mesh.png\"), image_export_format, settings_720p\n)\n\n# Display the mesh\nif GRAPHICS_BOOL:\n display_image(\"mesh.png\")"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Analysis\nSetup steady state thermal analysis\n\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"steady = Model.AddSteadyStateThermalAnalysis()\ntransient = Model.AddTransientThermalAnalysis()\n\ninternal_heat_generation = steady.AddInternalHeatGeneration()\nNSall = ExtAPI.DataModel.Project.Model.NamedSelections.GetChildren[\n Ansys.ACT.Automation.Mechanical.NamedSelection\n](True)\nic6 = [i for i in NSall if i.Name == \"ic-6\"][0]\ninternal_heat_generation.Location = ic6\ninternal_heat_generation.Magnitude.Output.SetDiscreteValue(0, Quantity(5e7, \"W m^-1 m^-1 m^-1\"))\n\nall_bodies = [i for i in NSall if i.Name == \"all_bodies\"][0]\nconvection = steady.AddConvection()\nconvection.Location = all_bodies\nconvection.FilmCoefficient.Output.DiscreteValues = [Quantity(\"5[W m^-2 C^-1]\")]\n\nsteady_solution = steady.Solution\ntemperature_result = steady_solution.AddTemperature()\nsteady_solution.Solve(True)\n\n# Transient analysis setup\ninitial_condition = transient.InitialConditions[0]\ninitial_condition.InitialTemperature = InitialTemperatureType.NonUniform\ninitial_condition.InitialEnvironment = steady\n\ntransient_analysis_settings = transient.AnalysisSettings\ntransient_analysis_settings.StepEndTime = Quantity(200, \"sec\")\n\ninternal_heat_generation2 = transient.AddInternalHeatGeneration()\n\nic1 = [i for i in NSall if i.Name == \"ic-1\"][0]\ninternal_heat_generation2.Location = ic1\ninternal_heat_generation2.Magnitude.Output.SetDiscreteValue(0, Quantity(5e7, \"W m^-1 m^-1 m^-1\"))"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Add result objects\n\n\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"transient_solution = transient.Solution\ntransient_temperature_result = transient_solution.AddTemperature()\ntemperature_probe1 = transient_solution.AddTemperatureProbe()\ntemperature_probe1.GeometryLocation = ic6\ntemperature_probe2 = transient_solution.AddTemperatureProbe()\ntemperature_probe2.GeometryLocation = ic1"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Solve\n\n\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"transient_solution.Solve(True)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Save files and close Mechanical\nMechanical file (mechdb) contains results for each analysis\n\n\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"app.save(os.path.join(OUTPUT_DIR, \"pcb.mechdb\"))\nproject_directory = ExtAPI.DataModel.Project.ProjectDirectory\napp.exit()"
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]
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 3",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"file_extension": ".py",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.12.9"
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"nbformat": 4,
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"nbformat_minor": 0
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}

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