PDF
Parameterized Woven Carbon Fibers Geometry
This is a template MPH-file containing the geometry for the model Anisotropic Heat Transfer through Woven Carbon Fibers. For a description of that model, including detailed step-by-step instructions showing how to build it, see Anisotropic Heat Transfer Through Woven Carbon Fibers.
Application Library path: COMSOL_Multiphysics/Heat_Transfer/carbon_fibers_geom
Modeling Instructions
From the File menu, choose New.
New
In the New window, click  Model Wizard.
Model Wizard
1
In the Model Wizard window, click  3D.
2
Click  Done.
Global Definitions
Parameters 1
1
In the Model Builder window, under Global Definitions click Parameters 1.
2
In the Settings window for Parameters, locate the Parameters section.
3
In the table, enter the following settings:
Name
Expression
Value
Description
w
4
4
Number of loops
n
2*w-1
7
Number of fibers per axis
l
0.2
0.2
Length of loop
amp
l/4
0.05
Amplitude of loop
q
1
1
Parameter controlling cross section
Part 1
1
In the Model Builder window, right-click Global Definitions and choose Geometry Parts > 3D Part.
2
In the Settings window for Part, locate the Units section.
3
From the Length unit list, choose cm.
4
Locate the Input Parameters section. In the table, enter the following settings:
Name
Default expression
Value
Description
a
0.2[mm]
0.02 cm
Cross section semiaxis
Local Parameters
1
Right-click Part 1 and choose Local Parameters.
2
In the Settings window for Local Parameters, locate the Local Parameters section.
3
In the table, enter the following settings:
Name
Expression
Value
Description
b
a
0.02 cm
Cross section semiaxis
Work Plane 1 (wp1)
1
In the Geometry toolbar, click  Work Plane.
2
In the Settings window for Work Plane, locate the Plane Definition section.
3
From the Plane list, choose yz-plane.
4
Click  Go to Plane Geometry.
Work Plane 1 (wp1) > Ellipse 1 (e1)
1
In the Work Plane toolbar, click  Ellipse.
2
In the Settings window for Ellipse, locate the Size and Shape section.
3
In the a-semiaxis text field, type a.
4
In the b-semiaxis text field, type b.
5
Right-click Part 1 and choose Rename.
6
In the Rename Part dialog, type Elliptical cross section in the New label text field.
7
Click OK.
Part 2
1
In the Model Builder window, under Global Definitions right-click Geometry Parts and choose 3D Part.
2
In the Settings window for Part, locate the Units section.
3
From the Length unit list, choose cm.
4
Locate the Input Parameters section. In the table, enter the following settings:
Name
Default expression
Value
Description
a
0.6[mm]
0.06 cm
 
Local Parameters
1
Right-click Part 2 and choose Local Parameters.
2
In the Settings window for Local Parameters, locate the Local Parameters section.
3
In the table, enter the following settings:
Name
Expression
Value
Description
b
a/2
0.03 cm
 
Work Plane 1 (wp1)
1
In the Geometry toolbar, click  Work Plane.
2
In the Settings window for Work Plane, locate the Plane Definition section.
3
From the Plane list, choose yz-plane.
4
Click  Go to Plane Geometry.
Work Plane 1 (wp1) > Rectangle 1 (r1)
1
In the Work Plane toolbar, click  Rectangle.
2
In the Settings window for Rectangle, locate the Size and Shape section.
3
In the Width text field, type a.
4
In the Height text field, type b.
5
Locate the Position section. From the Base list, choose Center.
6
In the Work Plane toolbar, click  Build All.
7
Right-click Part 2 and choose Rename.
8
In the Rename Part dialog, type Rectangular cross section in the New label text field.
9
Click OK.
Global Definitions
In the Model Builder window, collapse the Global Definitions node.
Geometry 1
1
In the Model Builder window, under Component 1 (comp1) click Geometry 1.
2
In the Settings window for Geometry, locate the Units section.
3
From the Length unit list, choose cm.
If 1 (if1)
1
In the Geometry toolbar, click  Programming and choose If + End If.
2
In the Settings window for If, locate the If section.
3
In the Condition text field, type q==1.
Elliptical cross section 1 (pi1)
In the Geometry toolbar, click  Part Instance and choose Elliptical cross section.
Else 1 (else1)
In the Model Builder window, right-click Geometry 1 and choose Programming > Else.
Rectangular cross section 1 (pi2)
1
In the Geometry toolbar, click  Part Instance and choose Rectangular cross section.
2
In the Settings window for Part Instance, click  Build All Objects.
Box Selection 1 (boxsel1)
1
In the Geometry toolbar, click  Selections and choose Box Selection.
2
In the Settings window for Box Selection, locate the Geometric Entity Level section.
3
From the Level list, choose Boundary.
4
Locate the Resulting Selection section. Clear the Keep selection checkbox.
5
Find the Cumulative selection subsection. Click New.
6
In the New Cumulative Selection dialog, type Cross section in the Name text field.
7
Click OK.
Work Plane 1 (wp1)
1
In the Geometry toolbar, click  Work Plane.
2
In the Settings window for Work Plane, locate the Selections of Resulting Entities section.
3
Find the Cumulative selection subsection. Click New.
4
In the New Cumulative Selection dialog, type Path in the Name text field.
5
Click OK.
6
In the Settings window for Work Plane, click  Go to Plane Geometry.
Work Plane 1 (wp1) > Cubic Bézier 1 (cb1)
1
In the Work Plane toolbar, click  More Primitives and choose Cubic Bézier.
2
In the Settings window for Cubic Bézier, locate the Control Points section.
3
In row 2, set xw to l/4.
4
In row 3, set xw to l/4.
5
In row 4, set xw to l/2.
6
In row 3, set yw to amp.
7
In row 4, set yw to amp.
Work Plane 1 (wp1) > Cubic Bézier 2 (cb2)
1
In the Work Plane toolbar, click  More Primitives and choose Cubic Bézier.
2
In the Settings window for Cubic Bézier, locate the Control Points section.
3
In row 1, set xw to l/2.
4
In row 2, set xw to 3*l/4.
5
In row 3, set xw to 3*l/4.
6
In row 4, set xw to l.
7
In row 1, set yw to amp.
8
In row 2, set yw to amp.
Work Plane 1 (wp1) > Convert to Curve 1 (ccur1)
1
In the Work Plane toolbar, click  Conversions and choose Convert to Curve.
2
Click in the Graphics window and then press Ctrl+A to select both objects.
3
In the Settings window for Convert to Curve, click  Build Selected.
4
Click the  Zoom Extents button in the Graphics toolbar.
Work Plane 1 (wp1) > Array 1 (arr1)
1
In the Work Plane toolbar, click  Transforms and choose Array.
2
Select the object ccur1 only.
3
In the Settings window for Array, locate the Size section.
4
In the xw size text field, type w.
5
Locate the Displacement section. In the xw text field, type l.
6
In the Work Plane toolbar, click  Build All.
7
Click the  Zoom Extents button in the Graphics toolbar.
Sweep 1 (swe1)
1
Right-click Geometry 1 and choose Sweep.
2
In the Settings window for Sweep, locate the Cross Section section.
3
From the Entities to sweep list, choose Cross section.
4
Locate the Spine Curve section. Click to select the  Activate Selection toggle button for Edges to follow.
5
From the Edges to follow list, choose Path.
6
Locate the Input Object Handling section. Clear the Keep input objects checkbox.
7
Click  Build All Objects.
8
Click the  Zoom Extents button in the Graphics toolbar.
Extrude 1 (ext1)
1
In the Geometry toolbar, click  Extrude.
2
In the Settings window for Extrude, locate the General section.
3
From the Extrude from list, choose Faces.
4
On the object swe1, select Boundary 1 only.
5
Locate the Distances section. In the table, enter the following settings:
Distances (cm)
l/2
Extrude 2 (ext2)
1
Right-click Extrude 1 (ext1) and choose Duplicate.
2
In the Settings window for Extrude, locate the General section.
3
Click to select the  Activate Selection toggle button for Input faces.
4
On the object ext1, select Boundary 46 only.
5
Click  Build All Objects.
Copy 1 (copy1)
1
In the Geometry toolbar, click  Transforms and choose Copy.
2
Select the object ext2 only.
3
In the Settings window for Copy, locate the Displacement section.
4
In the z text field, type l/2.
Array 1 (arr1)
1
In the Geometry toolbar, click  Transforms and choose Array.
2
Select the object ext2 only.
3
In the Settings window for Array, locate the Size section.
4
In the z size text field, type ceil(n/2).
5
Locate the Displacement section. In the z text field, type l.
6
Locate the Selections of Resulting Entities section. Find the Cumulative selection subsection. Click New.
7
In the New Cumulative Selection dialog, type Fiber array 1 in the Name text field.
8
Click OK.
Array 2 (arr2)
1
In the Geometry toolbar, click  Transforms and choose Array.
2
Select the object copy1 only.
3
In the Settings window for Array, locate the Size section.
4
In the z size text field, type floor(n/2).
5
Locate the Displacement section. In the z text field, type l.
6
Locate the Selections of Resulting Entities section. Find the Cumulative selection subsection. Click New.
7
In the New Cumulative Selection dialog, type Fiber array 2 in the Name text field.
8
Click OK.
9
In the Settings window for Array, click  Build Selected.
Mirror 1 (mir1)
1
In the Geometry toolbar, click  Transforms and choose Mirror.
2
In the Settings window for Mirror, locate the Input section.
3
From the Input objects list, choose Fiber array 2.
4
Locate the Point on Plane of Reflection section. In the y text field, type l/8.
5
Locate the Normal Vector to Plane of Reflection section. In the y text field, type 1.
6
In the z text field, type 0.
7
Click  Build Selected.
Rotate 1 (rot1)
1
In the Geometry toolbar, click  Transforms and choose Rotate.
2
Click in the Graphics window and then press Ctrl+A to select all objects.
3
In the Settings window for Rotate, locate the Input section.
4
Select the Keep input objects checkbox.
5
Locate the Rotation section. In the Angle text field, type 90.
6
Locate the Point on Axis of Rotation section. In the x text field, type w*l/2.
7
In the z text field, type n/2*l/2-l/4.
8
Locate the Rotation section. From the Axis type list, choose y-axis.
9
Click  Build All Objects.
Mirror 2 (mir2)
1
In the Geometry toolbar, click  Transforms and choose Mirror.
2
Select the objects arr1(1,1,1), arr1(1,1,2), arr1(1,1,3), arr1(1,1,4), mir1(1), mir1(2), and mir1(3) only.
3
In the Settings window for Mirror, locate the Point on Plane of Reflection section.
4
In the y text field, type l/8.
5
Locate the Normal Vector to Plane of Reflection section. In the y text field, type 1.
6
In the z text field, type 0.
7
Click  Build Selected.
Union 1 (uni1)
1
In the Geometry toolbar, click  Booleans and Partitions and choose Union.
2
Click in the Graphics window and then press Ctrl+A to select all objects.
3
In the Settings window for Union, locate the Selections of Resulting Entities section.
4
Find the Cumulative selection subsection. Click New.
5
In the New Cumulative Selection dialog, type Fibers in the Name text field.
6
Click OK.
Block 1 (blk1)
1
In the Geometry toolbar, click  Block.
2
In the Settings window for Block, locate the Size and Shape section.
3
In the Width text field, type l*(w+1).
4
In the Depth text field, type 5/8*l.
5
In the Height text field, type l*(w+1).
6
Locate the Position section. From the Base list, choose Center.
7
In the x text field, type (n+1)*l/4.
8
In the y text field, type l/8.
9
In the z text field, type (n-1)*l/4.
10
Click to expand the Layers section. In the table, enter the following settings:
Layer name
Thickness (cm)
Layer 1
l/2
11
Find the Layer position subsection. Select the Left checkbox.
12
Select the Right checkbox.
13
Select the Top checkbox.
Union 2 (uni2)
1
In the Geometry toolbar, click  Booleans and Partitions and choose Union.
2
Click in the Graphics window and then press Ctrl+A to select both objects.
3
In the Settings window for Union, click  Build All Objects.
4
Click the  Zoom Extents button in the Graphics toolbar.
Geometry 1
In the Model Builder window, collapse the Component 1 (comp1) > Geometry 1 node.
Definitions
Infinite Element Domains
1
In the Model Builder window, expand the Component 1 (comp1) > Definitions node.
2
Right-click Definitions and choose Selections > Explicit.
3
Click the  Wireframe Rendering button in the Graphics toolbar.
4
In the Settings window for Explicit, locate the Input Entities section.
5
Click  Paste Selection.
6
In the Paste Selection dialog, type 1-11, 13, 21, 29, 46-47, 55, 63, 80-81, 89, 97, 114-115, 123, 131, 140-149 in the Selection text field.
7
Click OK.
8
In the Settings window for Explicit, type Infinite Element Domains in the Label text field.
Core Domains
1
In the Definitions toolbar, click  Complement.
2
In the Settings window for Complement, locate the Input Entities section.
3
Under Selections to invert, click  Add.
4
In the Add dialog, select Infinite Element Domains in the Selections to invert list.
5
Click OK.
6
In the Settings window for Complement, type Core Domains in the Label text field.
Core Boundaries
1
In the Definitions toolbar, click  Adjacent.
2
In the Settings window for Adjacent, locate the Input Entities section.
3
Under Input selections, click  Add.
4
In the Add dialog, select Core Domains in the Input selections list.
5
Click OK.
6
In the Settings window for Adjacent, type Core Boundaries in the Label text field.
Epoxy (Core)
1
In the Definitions toolbar, click  Difference.
2
In the Settings window for Difference, locate the Input Entities section.
3
Under Selections to add, click  Add.
4
In the Add dialog, select Core Domains in the Selections to add list.
5
Click OK.
6
In the Settings window for Difference, locate the Input Entities section.
7
Under Selections to subtract, click  Add.
8
In the Add dialog, select Fibers in the Selections to subtract list.
9
Click OK.
10
In the Settings window for Difference, type Epoxy (Core) in the Label text field.
Fibers (Core)
1
In the Definitions toolbar, click  Difference.
2
In the Settings window for Difference, locate the Input Entities section.
3
Under Selections to add, click  Add.
4
In the Add dialog, select Fibers in the Selections to add list.
5
Click OK.
6
In the Settings window for Difference, locate the Input Entities section.
7
Under Selections to subtract, click  Add.
8
In the Add dialog, select Infinite Element Domains in the Selections to subtract list.
9
Click OK.
10
In the Settings window for Difference, type Fibers (Core) in the Label text field.
Fiber Boundaries (Core)
1
In the Definitions toolbar, click  Adjacent.
2
In the Settings window for Adjacent, locate the Input Entities section.
3
Under Input selections, click  Add.
4
In the Add dialog, select Fibers (Core) in the Input selections list.
5
Click OK.
6
In the Settings window for Adjacent, type Fiber Boundaries (Core) in the Label text field.
Heat Source Boundary
1
In the Definitions toolbar, click  Explicit.
2
In the Settings window for Explicit, locate the Input Entities section.
3
From the Geometric entity level list, choose Boundary.
4
Select Boundary 53 only.
5
In the Label text field, type Heat Source Boundary.
Cooling Boundaries
1
In the Definitions toolbar, click  Explicit.
2
In the Settings window for Explicit, locate the Input Entities section.
3
From the Geometric entity level list, choose Boundary.
4
Select Boundaries 53 and 95 only.
5
In the Label text field, type Cooling Boundaries.
Plane 1
1
In the Definitions toolbar, click  Explicit.
2
In the Settings window for Explicit, locate the Input Entities section.
3
From the Geometric entity level list, choose Boundary.
4
Select the Group by continuous tangent checkbox.
5
Select Boundaries 9, 49, 52, 55, 57, 59, 62, 65, 74, 77, 80, 83, 122, 212, 294, 384, 466, 556, 638, and 707 only.
6
In the Label text field, type Plane 1.
Plane 2
1
In the Definitions toolbar, click  Explicit.
2
In the Settings window for Explicit, locate the Input Entities section.
3
From the Geometric entity level list, choose Boundary.
4
Select Boundary 6 only.
5
Select the Group by continuous tangent checkbox.
6
Select Boundaries 6, 54, 102, 206, 274, 378, 446, 550, 618, 699, 702, 704, 705, 709, 712, 715, 724, 727, 730, and 733 only.
7
In the Label text field, type Plane 2.
Intersection 1
1
In the Definitions toolbar, click  Intersection.
2
In the Settings window for Intersection, locate the Geometric Entity Level section.
3
From the Level list, choose Boundary.
4
Locate the Input Entities section. Under Selections to intersect, click  Add.
5
In the Add dialog, in the Selections to intersect list, choose Core Boundaries and Fiber Boundaries (Core).
6
Click OK.
Inlets
1
In the Definitions toolbar, click  Difference.
2
In the Settings window for Difference, locate the Geometric Entity Level section.
3
From the Level list, choose Boundary.
4
Locate the Input Entities section. Under Selections to add, click  Add.
5
In the Add dialog, select Intersection 1 in the Selections to add list.
6
Click OK.
7
In the Settings window for Difference, locate the Input Entities section.
8
Under Selections to subtract, click  Add.
9
In the Add dialog, select Plane 1 in the Selections to subtract list.
10
Click OK.
11
In the Settings window for Difference, type Inlets in the Label text field.
Outlets
1
In the Definitions toolbar, click  Difference.
2
In the Settings window for Difference, locate the Geometric Entity Level section.
3
From the Level list, choose Boundary.
4
Locate the Input Entities section. Under Selections to add, click  Add.
5
In the Add dialog, select Intersection 1 in the Selections to add list.
6
Click OK.
7
In the Settings window for Difference, locate the Input Entities section.
8
Under Selections to subtract, click  Add.
9
In the Add dialog, select Plane 2 in the Selections to subtract list.
10
Click OK.
11
In the Settings window for Difference, type Outlets in the Label text field.
Epoxy Boundaries (Core)
1
In the Definitions toolbar, click  Difference.
2
In the Settings window for Difference, locate the Geometric Entity Level section.
3
From the Level list, choose Boundary.
4
Locate the Input Entities section. Under Selections to add, click  Add.
5
In the Add dialog, select Core Boundaries in the Selections to add list.
6
Click OK.
7
In the Settings window for Difference, locate the Input Entities section.
8
Under Selections to subtract, click  Add.
9
In the Add dialog, in the Selections to subtract list, choose Inlets and Outlets.
10
Click OK.
11
In the Settings window for Difference, type Epoxy Boundaries (Core) in the Label text field.
Temperature Boundaries
1
In the Definitions toolbar, click  Explicit.
2
In the Settings window for Explicit, locate the Input Entities section.
3
From the Geometric entity level list, choose Boundary.
4
Select the Group by continuous tangent checkbox.
5
Select Boundaries 1, 3, 4, 7, 10, 11, 14, 17, 26, 29, 32, 35, 51, 58, 99, 123, 205, 213, 271, 295, 377, 385, 443, 467, 549, 557, 615, 639, 701, 708, and 747–756 only.
6
In the Label text field, type Temperature Boundaries.
Fiber Walls
1
In the Definitions toolbar, click  Difference.
2
In the Settings window for Difference, locate the Geometric Entity Level section.
3
From the Level list, choose Boundary.
4
Locate the Input Entities section. Under Selections to add, click  Add.
5
In the Add dialog, select Fiber Boundaries (Core) in the Selections to add list.
6
Click OK.
7
In the Settings window for Difference, locate the Input Entities section.
8
Under Selections to subtract, click  Add.
9
In the Add dialog, in the Selections to subtract list, choose Inlets and Outlets.
10
Click OK.
11
In the Settings window for Difference, type Fiber Walls in the Label text field.
Inlet Edges
1
In the Definitions toolbar, click  Adjacent.
2
In the Settings window for Adjacent, locate the Input Entities section.
3
From the Geometric entity level list, choose Boundary.
4
Under Input selections, click  Add.
5
In the Add dialog, select Inlets in the Input selections list.
6
Click OK.
7
In the Settings window for Adjacent, locate the Output Entities section.
8
From the Geometric entity level list, choose Adjacent edges.
9
In the Label text field, type Inlet Edges.
Fibers (Infinite Element Domain)
1
In the Definitions toolbar, click  Intersection.
2
In the Settings window for Intersection, locate the Input Entities section.
3
Under Selections to intersect, click  Add.
4
In the Add dialog, in the Selections to intersect list, choose Infinite Element Domains and Fibers.
5
Click OK.
6
In the Settings window for Intersection, type Fibers (Infinite Element Domain) in the Label text field.
Component 1 (comp1)
In the Model Builder window, collapse the Component 1 (comp1) node.