2 Surface settings Expression, Replace ExpressionElectric Currents > Currents and charge > Current density norm (ec.normJ) Enter .

ec.normJ , . ec.normJ Expression.

3Plot .

, ..

4Surface settings Range, Manual color range. 1e6Maximum.

Example 2: The Busbar—A Multiphysics Model | 71

5Plot . . Go to Default 3D View Graphics .

, 90-. , .

6, . , .

, . , busbar.mph,.

Go to Default 3D View Graphics.

72 | Example 2: The Busbar—A Multiphysics Model

(CREATING MODEL IMAGES FROM PLOTS)

- , COMSOL. (plot), Model BuilderResults plot. (). Root settings Model Thumbnail, Set Model Thumbnail.

. -Image Snapshot Graphics .Image Export, ,Add Image to Export.

., , , ,.

Example 2: The Busbar—A Multiphysics Model | 73

(AdvancedTopics)

, , ’ (Parameters, Functions,

Variables and Couplings)

, ,’.

Global Definitions Component Definitions ,’. «Global Definitions”50.

, Global Definitions Component Definitions,, Multiphysics . , Step.

, , ,0 200,5 . ,, Vtot. , 0 1 0,5 , ,.

(DEFINING FUNCTIONS)

, ,. busbar.mph,.

74 | Advanced Topics

1 Global Definitions Functions > Step .

2Step, 0.25 Location , , 0.5.

3Smoothing 0.5 Size of the transition zone, . Number of continuous derivatives (2).

4Plot Step.

Advanced Topics | 75

, , ,.

,.

5

Step 1 Model Builder Properties

76 | Advanced Topics

6Properties - .

, , , .

-, Component 1, , .

1Component 1

Rename ( F2).

2Rename Component Busbar. OK .

’

Definitions Busbar

(comp1), ’ , -

(comp1) ,.’ , , Global

Definitions, .

ComponentCouplings Definitions. Average , Maximum , Minimum ’,

Advanced Topics | 77

.

average «Parametric Sweeps” 103. «Functions» 135,COMSOL.

, Model BuilderDefinitions Global Definitions F1, ..

(Material Properties and Material Libraries)

, . ,.. , ,, ,.Excel®Livelink ™ Excel®.

MaterialLibrary 2500.

(CUSTOMIZING MATERIALS)

.

1Model Builder, Materials, Copper .

78 | Advanced Topics

2Material settings, Materials Properties .

Solid Mechanics > Linear Elastic Material. Bulk Modulus and Shear Modulus Add to Material.

’.

3Material Contents. Bulk modulus and Shear modulus

. , . , Value. Bulk modulus 140e9 Shear modulus 46e9.

Copper.Solid Mechanics,, .

4Model Builder, Copper Add Material to “User Defined Library” .

Advanced Topics | 79

(Adding Meshes)

,. , , .

, , ,.

1busbar.mph,.

ၣၢၘၔၟၰၬၢၗၢ,File>Save Asbusbar_I.mph.

3,

Component 1(comp1)

Add Mesh .

, Meshes, Mesh 1, Mesh 2.

4Mesh 2.

Mesh settings MeshSettings,

User-controlled mesh Sequence type.

Size Free TetrahedralMesh 2.

80 | Advanced Topics