findElectromagneticSource

(To be removed) Find electromagnetic source assigned to geometric region

Since R2021a

findElectromagneticSource will be removed. Use the CellLoad and FaceLoad properties of femodel instead. (since R2023a) For more information on updating your code, see Version History.

Syntax

emSource = findElectromagneticSource(sources,RegionType,RegionID)

Description

emSource = findElectromagneticSource(sources,RegionType,RegionID) returns the change or current density emSource assigned to the specified region of the specified model.

Examples

Find Current Density for Faces of 2-D Geometry

Create an electromagnetic model for magnetostatic analysis.

emagmodel = createpde("electromagnetic","magnetostatic");

Include the L-shaped membrane geometry in the model and plot it with the face labels.

geometryFromEdges(emagmodel,@lshapeg);
pdegplot(emagmodel,"FaceLabels","on")
ylim([-1.1 1.1])
axis equal

Specify a different current density for each face.

electromagneticSource(emagmodel,"Face",1,"CurrentDensity",10);
electromagneticSource(emagmodel,"Face",2,"CurrentDensity",20);
electromagneticSource(emagmodel,"Face",3,"CurrentDensity",30);

Check the electromagnetic source specification for each face.

findElectromagneticSource(emagmodel.Sources,"Face",1)

ans = 
  ElectromagneticSourceAssignment with properties:

        RegionType: 'Face'
          RegionID: 1
     ChargeDensity: []
    CurrentDensity: 10
     Magnetization: []

findElectromagneticSource(emagmodel.Sources,"Face",2)

ans = 
  ElectromagneticSourceAssignment with properties:

        RegionType: 'Face'
          RegionID: 2
     ChargeDensity: []
    CurrentDensity: 20
     Magnetization: []

findElectromagneticSource(emagmodel.Sources,"Face",3)

ans = 
  ElectromagneticSourceAssignment with properties:

        RegionType: 'Face'
          RegionID: 3
     ChargeDensity: []
    CurrentDensity: 30
     Magnetization: []

Input Arguments

sources — Source in electromagnetic model

Sources property

Source in an electromagnetic model, specified as the Sources property of the model.

Example: findElectromagneticSource(emagmodel.Sources,"Face",1)

RegionType — Geometric region type

"Face" for a 2-D model | "Cell" for a 3-D model

Geometric region type, specified as "Face" for a 2-D model or "Cell" for a 3-D model.

Data Types: char | string

RegionID — Region ID

vector of positive integers

Region ID, specified as a vector of positive integers. Find the face or cell IDs by using pdegplot with the "FaceLabels" or "CellLabels" name-value argument set to "on".

Data Types: double

Output Arguments

emSource — Electromagnetic source assignment

ElectromagneticSourceAssignment object

Electromagnetic source assignment, returned as an ElectromagneticSourceAssignment object. For more information, see ElectromagneticSourceAssignment Properties.

Version History

Introduced in R2021a

R2025a: To be removed

findElectromagneticSource will be removed. Use the CellLoad and FaceLoad properties of femodel instead.

For example, you can check the electromagnetic source for the three faces of the 2-D geometry as follows.

model = femodel(AnalysisType="magnetostatic", ...
                Geometry=@lshapeg);
model.FaceLoad(1) = faceLoad(CurrentDensity=10);
model.FaceLoad(2) = faceLoad(CurrentDensity=20);
model.FaceLoad(3) = faceLoad(CurrentDensity=30);
model.FaceLoad

The unified finite element model workflow defines the type of a problem and all of its parameters as the properties of an femodel object. This object enables you to specify physical parameters for structural, thermal, and electromagnetic types of analyses. The solver in the unified workflow uses only the parameters (properties) appropriate for the current analysis type while ignoring all other properties. If you switch the analysis type by setting the AnalysisType property of the model, the solver uses the appropriate set of properties corresponding to the new analysis type.

For more help migrating your existing code that uses ElectromagneticModel to the unified finite element workflow, see Migration from Domain-Specific to Unified Workflow.