DM-Intro_15.0_L04_Geometry_Modeling
Lecture 4:
Geometry Modeling
15.0 Release Introduction to ANSYS DesignModeler
Overview
In this lecture we will learn about: ?DesignModeler Concepts
?How to create a 3D geometry?
?How to modify/transform a geometry? ?Part Management
?Concepts in DM from meshing perspective
Preprocessing Workflow Sketches and Planes
Geometry Import Options
3D Operations
Bi-Directional
CAD/ Neutral Geometry Cleanup and Repair
Automatic
Cleanup
Simplification,
Mid-surface,
Fluid Extraction
Extrude, Revolve, Sweep, etc 3D Operations
Booleans,
Decompose, etc.
Import/ Geometry Creation
Geometry
Modifications Meshing Solver
Meshing Methods
Hybrid Mesh: Tet,
Prisms, Pyramids
Hexa Dominant,
Sweep meshing
Global Mesh
Settings
Local Mesh Settings
Sizing, Controls,
etc.
Assembly
Meshing
Body Types In DesignModeler
?Line body
–Has length and consists of points as lower entity
?Surface body
–Has surface area and consists of points & edges as lower entities
?Solid body
–Has volume and consists of points, edges & faces as lower entities
?Bodies are listed in the Tree Outline identified by default names and icons
Surface body
Line body Solid body
Body States
–Active
?Active bodies merge automatically with bodies in contact or overlapping.
–
By default, DM creates Active bodies. To avoid active bodies or parts to merge together, use Add Frozen wisely.
–Frozen ?Frozen bodies remain independent
?Why to use Frozen bodies?
–If Meshing requires bodies to be decomposed
–If Solver requires different boundary & continuum conditions to be applied to different areas of the model
?“Unfreeze” can be used to Selectively convert Frozen bodies to Active State
Active State: Single body after two
feature creation operations Frozen State: Two bodies (one frozen)
3D Features
Tools for creating new bodies or modifying existing bodies
–Used to create bodies
–Requires lower dimensioned geometry as base objects
–Result is a line/surface/solid body
–Applies blend/chamfer on edges/faces of existing bodies
–Used to modify existing bodies
–Results in modified or new bodies
–Quick creation of primitive shapes (without sketch)
Extrude Details ?Geometry
–Can be a valid Sketch, selected face or Named Selection ?
Operation
–Allows Add Material, Cut Material, Imprint Faces, Slice Material, Add Frozen ?
Direction Vector
–Default option is Normal
?Other options are Reversed, Both-Symmetric and Both-Asymmetric
?Plane axes, geometric edges and faces can be used to specify direction
?Extent Type
–Fixed, Through All, To Next, To Faces, To Surface
Extrude
Sketch
Preview of the operation
Resultant body
Extent - Fixed
Direction - Symmetric
Direction - Asymmetric
Options for Operation
?Add Material
–Creates new body and unites with existing active bodies in contact or overlap
?Add Frozen:
–An independent body is created, with separate faces and edges
?Cut Material:
–Create holes or modify existing bodies by removing material
?Imprint Faces:
Sketch
–Imprints the sketch on the faces of existing body. This only works for Active bodies
?Slice Material:
–Slice out resultant body from the existing Frozen body
Add Material Add Frozen Cut Material Imprint Faces Slice Material
Sweep
Sweep Details
?Selected profile is swept along selected path to
create bodies ?
Profile
–Profile could be any sketch or entity to be swept
?Path
–Path could be a sketch or edge (open or closed)
?Alignment
–Path Tangent OR Global Axes
Profile
Path
Alignment - Path
Tangent
Alignment - Global
Axes
Swept Model
Skin/Loft Feature
Skin/Loft Details
?Takes a series of profiles and creates a body fitting through them
–All profiles must have the same number of edges
Multiple
sketches
Thin/Surface
Thin Surface Details
?Creates Thin Solid or Shell (Surface)
–Creation based on Selection Type; Faces to Keep/Faces to Remove/Bodies Only
–Faces to Keep: Selected faces used to form the thin solid or surface
–Faces to Remove: Unselected faces used
–Bodies Only: All faces used
–Specification of zero thickness will create a surface body (can specify offset)
–Direction for generation of thickness can be inward, outward or both (midplane)
Fixed Radius Blend
Fixed Radius Blend Details
?Creates a blend of specified radius on face/edges
Face Selection
Edge Selection
Pattern
Pattern Details
?Creates multiple copies of selected features in selected direction(s)
?Types of Pattern
–Linear, Circular and Rectangular
?Select Geometry (A Feature or bodies)
Body Tranformation
Body Transformation Tools
?Contains 5 tools for transforming bodies
–Move
–Translate
–Rotate
–Mirror
–Scale
?Creates a mirror image body reflected in
selected plane
–Used for creating a full model from partial model which is Symmetrical ?Set Mirror Plane
?Select body/bodies to be mirrored
?Original body deletion controlled by ‘Preserve Bodies’ option
?
Example – Mirroring car body in the XY Plane preserving the original
Body Transformation: Mirror
XY Plane
?Moves and aligns selected bodies
?Select body or bodies
?Select option to Preserve Bodies
?Set Source and Destination Planes ?Example – Aligning two bodies using
corresponding source and destination planes on each body respectively
Scale up : 2x
?Scale selected body or bodies
?Select body or bodies ?Set Scaling origin
–World Origin : Global coordinate origin
–Body Centroids: Centroid of the bodies selected –Point: Selected Point
?Option to for Uniform or Non-uniform Scaling
Body Operation
Body Operation Tools
?Contains 6 tools for manipulating bodies
?Options vary depending on whether the bodies are Active or Frozen
?Cut Material is not available if all bodies are Frozen
Body Operation: Slice Material ?To Slice out one body from the another body
Tool Bodies
Intersect all bodies
Union of all intersections
Union of all intersections preserving input bodies
Unite, Subtract and Intersect
?Unite: Merges two or more bodies
?Subtract: Target Body subtract Tool Body ?Intersection:
–Union of All Intersections: Regions shared by two or more Tool Bodies
–Intersection of All Bodies: Regions shared by all Tool Bodies
Boolean