Solid Modeling

ANSYS short course,3-5 Dec 2013, UTP 2

Pre-Processor

Solver

Post-Processor

5 steps involved in the procedure

1. Computer modeling, mesh generation

2. Definition of materials properties.

3. Assemble of elements

4. Boundary conditions and loads defined

5. Solution using the required solver and display results/data

Typical Steps in FEM

Geometry Modeling• Modeling hierachy

– Keypoints– Lines– Areas– Volume

• Geometric primitives– Area

• Rectangle• Circle• Polygon

– Volume• Block• Cylinder• Sphere• Etc..

ANSYS short course,3-5 Dec 2013, UTP 3

Practice #1• Create

– Keypoints (-1,-0.5,-1); (1,-0.5,-1); (-1,-0.5,1); (1,-0.5,1) (-1,0.5,-1); (1,0.5,-1); (-1,0.5,1); (1,0.5,1)– Lines– Areas– Volumes

• Delete– Volumes– Areas– Lines (ldel,all or ldel,line#)– Keypoints (kdel,Keypoint#, i.e, kdel,9)

ANSYS short course,3-5 Dec 2013, UTP 4

GUI for Boolean Operations

ANSYS short course,3-5 Dec 2013, UTP 5

PreprocessorModeling

OperateBooleans

Boolean Operations

We focus on ..

• Add• Substract• Divide

ANSYS short course,3-5 Dec 2013, UTP 6

Add

Add Command GUI separate areas to create a single area

AADD Main Menu> Preprocessor> Modeling> Operate> Booleans> Add> Areas

separate volumes to create a single volume

VADD Main Menu> Preprocessor> Modeling> Operate> Booleans> Add> Volumes

ANSYS short course,3-5 Dec 2013, UTP 7

An addition of entities defines a new entity that includes all parts of the originals. (Also known mathematically as a union, joining, or summation.) Resulting entity - a single seamless whole, containing no internal divisions.

Area and Volume Additions

ANSYS short course,3-5 Dec 2013, UTP 8

Subtraction

ANSYS short course,3-5 Dec 2013, UTP 9

Results in lines with a common end point, or areas with a common line boundary, or volumes sharing a common boundary area. Resulting entities - no longer share common boundaries but have distinct but coincident boundaries.

Subtract Command GUI lines from lines LSBL Main Menu> Preprocessor> Modeling>

Operate> Booleans> Subtract> Lines Main Menu> Preprocessor> Modeling> Operate> Booleans> Subtract> With Options> Lines Main Menu> Preprocessor> Modeling> Operate> Booleans> Divide> Line by Line Main Menu> Preprocessor> Modeling> Operate> Booleans> Divide> With Options> Line by Line

areas from areas ASBA Main Menu> Preprocessor> Modeling> Operate> Booleans> Subtract> Areas Main Menu> Preprocessor> Modeling> Operate> Booleans> Subtract> With Options> Areas Main Menu> Preprocessor> Modeling> Operate> Booleans> Divide> Area by Area Main Menu> Preprocessor> Modeling> Operate> Booleans> Divide> With Options> Area by Area

volumes from volumes VSBV Main Menu> Preprocessor> Modeling> Operate> Booleans> Subtract> Volumes Main Menu> Preprocessor> Modeling> Operate> Booleans> Subtract> With Options> Volumes

Area and Volume Subtractions

ANSYS short course,3-5 Dec 2013, UTP 10

Division

ANSYS short course,3-5 Dec 2013, UTP 11

Subtract the intersection of the working plane from

Command GUI

lines LSBW Main Menu> Preprocessor> Modeling> Operate> Booleans> Divide> Line by WrkPlane Main Menu> Preprocessor> Modeling> Operate> Booleans> Divide> With Options> Line by WrkPlane

areas ASBW Main Menu> Preprocessor> Operate> Divide> Area by WrkPlane Main Menu> Preprocessor> Modeling> Operate> Booleans> Divide> With Options> Area by WrkPlane

volumes VSBW Main Menu> Preprocessor> Modeling> Operate> Booleans> Divide> Volu by WrkPlane Main Menu> Preprocessor> Modeling> Operate> Booleans> Divide> With Options> Volu by WrkPlane

The working plane can be subtracted from an entity to divide it into two or more entities

ANSYS short course,3-5 Dec 2013, UTP 12

Area and Volume Division

More

• Area fillets• Skinning• Extrude

ANSYS short course,3-5 Dec 2013, UTP 13

Workshop #1

• Create an L-support with holes

ANSYS short course,3-5 Dec 2013, UTP 14

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