snecma 14.5 l02 introduction to dm
TRANSCRIPT
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Lecture 2
Introduction to Design Modeler
Introduction to ANSYS Design
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Overview
• DesignModeler is a tool
– For importing CAD models for pre-
processing before engineering analysis
– For geometry simplification/modification
and preparation for meshing
– For parametric feature-based modeling
Application Fundamentals• Two basic modes of operation for geometry
creation
– 2D Sketching
– 3D Modeling (Surfaces and Solids)
• Dedicated tools for import & clean-up
What is DesignModeler?
Sketching
CAD Import
& Clean-up
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Launching DesignModeler
From Component Systems
Eg: Geometry, Mesh
From Analysis Systems
Eg: Fluid Flow (Fluent), Fluid Flow (CFX)
• ANSYS DesignModeler is launched within Workbench
• Double click Geometry in the System or right click and select E
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Toolbars
Tree Outline
Mode Tabs
Details View
Status/Info Bar
G
W
Entity Details Bar
DesignModeler Interface
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DesignModeler is a History based modelingtool
• Tree Outline is where are being displayed the
recorded sequential feature operations
– Starts with three default Planes
– XY, ZX & YZ
– Sketches are created on Planes
• Modeling Operations are listed sequentially,
which can be edited/deleted
• The Bodies/Parts which are created by the
Modeling Operations are listed beneath them
• This list of Bodies/Parts is not feature based
– Changes can only be made based on Featureoperations in the Tree Outline
– Changes by Part Management operations such as
Form a New Part
Tree Outline
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Working with the Details View
• Feature inputs are listed in the Details View
• The second column contains user inputvalues or selections
• Each input box is activated by Left Click
• Boxes requiring entity selection (Sketch,
Geometry etc) will display Apply/Cancel
when activated
• Yellow boxes indicate that input is required
(numeric or selection input).
Details View
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Status/Info Bar
- Displays Status of geometry model
- Displays dynamic instructions
- Eg: Entity Details Bar
- Displays details of entity selected in
Window or Tree Outline.
- Eg:
Units D
- Displ
curre
Info Bars
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Toolbars can be accessed to get quick access to most commonly used featu
• The most commonly used toolbars are
• Selection
• View Controls
• Display Controls
• Toolbars can also be customized to Add/Remove features of user’s choi
Toolbars
Box Selection Options
Criteria based Coloring
for Diagnostics/Visualization
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Suppressing Bodies
• Behaviour of Suppressed Body
– Will not be exported or transferred to otherWorkbench modules
– Not visible in Graphics view
– Identified by cross sign in Tree Outline
• How to Suppress or Unsuppress?
– Select the body to be suppressed, right click
and select “Suppress Body”
– Select the body/bodies to be unsuppressed,
right click and select “Unsuppress Body”
• Please note: Suppressing & unsuppressing bodies may
change some features in tree, wherever they were used.
Suppression
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Hiding Geometry
• Behaviour of Hidden Bodies
– In Tree Outline, Hidden body is identified by
transparent “tick-mark” sign
– Hidden bodies are transferred to other
Workbench modules and can also be
exported
• Useful when working with complex models
• How to Hide or Unhide?
– Select the body or face to hide, right click
and select “Hide Body” OR Press F9
– Right click “Show Body” to restore view
Visibility
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What are Named Selections?
• Any number of entities grouped together under one
name• These can be used to:
– Group Entities together for display purposes
– Define boundary conditions
– Apply Mesh Settings
– Define Meshing Order
• Can be created using one of two ways
– Select an entity or a group of entities, click RMB, select‘Named Selection’ from the context menu or…
– Select an entity or a group of entities, click on Tools menu
and select ‘Named Selection’
• Named Selections can be assigned to groups points,
lines, surfaces or solids.
Named Selections
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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 todifferent areas of the model
• “Unfreeze” can be used to Selectively convert Frozen bodies to Active State
Important DM Concepts
Active State: S
feature creatio
Frozen State: T
after two feat
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Thin Surface Details
• Creates Thin Solid or Shell (Surface)
– Faces to Keep: Selected faces used to form the thin
solid or surface
– Faces to Remove: Unselected faces used
• Ability to Create a 2D model from a 3D one
– A symmetry command can be used first to cut a 3D
model in half with the XY plane
– Then use Thin Surface / Face to Keep to keep only the
symmetry plane 2D model
Thin/Surface
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3D to 2D
3D CAD3D CAD after
Symmetry2D surfa
Selection for Thin
Surface / Faces to Keep
Note : 2D models must be in XY plane
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Geometry Cleanup/Repair: Introductio
• DM provides geometry tools to:
– Analyze
– Repair – Modify/Simplify
• All these commands are available under
the Tools Menu
• May need to view the model in wireframe
mode to visualize the problematic areas
• DM also give the ability to color edges
depending on connectivity
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• Used to remove features such as fillets, chamfers, holes e
automatically heal the geometry at those locations
•
Four Options for Healing: Automatic, Natural, Patch or N
Face Delete
Automatic
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Working with Parts
• By default, DM places each body into one
part by itself• Single-body parts : Individual parts are
meshed separately
– Non-conformal mesh at interface
• Multi-body part : Two or more bodies in a
single part
– Conformal mesh at interface if SharedTopology set to “Automatic”
• Bodies can be grouped into a part in 2
ways :
– Select bodies. Click RMB and select Form New
Part
– Select bodies. Go to Tools Form New Part
Single and Multi-Body Parts
Single-body Parts
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• Case 1: In DM: 3 parts, 3 bodies consisting of 3 solids
• Result of transferring this geometry to Meshing
– Contains: 3 solids, 3 bodies
– Each solid is meshed independently
– Nodes are not shared and do not line-up
– No connection between the 3 mesh regions for fluid flow and/or heat
transfer
– Contact pairs are automatically created between parts/bodies in
ANSYS Mechanical to transfer loads
Single and Multi-Body Parts
DM Mesh
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• Case 2: In DM: 1 multi-body part, 3 bodies/solids
• Result of transferring this geometry for Meshing
–Contains: 1 multi-body part, 3 bodies/solids
– Each solid meshed independently but node connectivity
among solids is preserved
– Contains internal face which can be used for Post Processing
– No contact pair is created in ANSYS Mechanical
Single and Multi-Body Parts
DM Mesh
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• Shared Topology can be completed manually using
• Uses of Shared Topology
– For getting Conformal mesh
– Imprinting for Contacts or Interface definition
• Options
– For generating a conformal mesh for a Multibody Part, Shared Topology
needs to be completed with “Automatic” setting
– If conformal mesh is not required between two bodies in Part, but imprints
of faces of one body on other are required (for defining contacts in
Mechanical or Interface in Fluent), Shared Topology needs to be completed
with “Imprint” setting
– For non-conformal, non-imprinted mesh on a body, Shared Topology setting
needs to be kept “None”
Shared Topology
Share
throu
OR Sh
set fo
manu
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• helps execute a set of operations repeatedly with different input values
• Useful for analyzing multiple design points By modifying geometry/topology parameters
•
Parameters can be either used for : Sketch dimensions, Plane creation inputs, 3D operation values, etc.
• Parameters can be linked with each other through expressions Defined in Design Modeler or Workbench
• Parameters can be controlled from Workbench No need for Design Modeler to be opened
CAD Connection
CAD Connections & Parameterization
Parameterization
What is it ?
T f P
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Types of Parameters
Changes the dimensions or locations of a givenfeature
• Does not necessarily change the total
number of entities in the model
Geometric parameters
Modifying the feature itself by aremoving geometry
• Can change total number of
model
Topological parameters
Parameterized
number of copies
in a pattern
Parameterized
dimension
Bi directional CAD Connectivity & Para
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Bi-directional CAD Connectivity & Para
Pro.Engineer
• H
• N
Para
Parameters from
WB to CAD
Parameters from
CAD to WB
CAD Parameters
DM Param
C ti P t i D i M d l
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Procedure
• Any input prefixed with the “□” symbol can be parameterized
–Toggle “□” to “D” to parameterize that particular input
• Default Parameter Name Pattern
– Feature Name.Dimension Reference
• Parameter name can be changed
Examples:
Creating Parameters in Design Modele
A dimension reference (H1) for a sketch
created on the XYPlane = XYPlane.H1
A dime
Extrud
P t M
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Accessible from the Toolbar or Tools menu
•
Design Parameters tab – List the existing parameters & assigned values
• Parameter/Dimension Assignments tab
– Contains expressions
• relating the original dimension reference to the
value set in the Design Parameters tab
Parameter Manager
This 2 defined parameters become obsolete
and can be suppressed (or deleted)
Create the needed expr
‟Check
”to evaluate
Parameter Manager
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• Parameters created into Design Modeler can either be managed in:
– Parameter Editor in DM
–Parameter Set in WB
Parameter Manager
Expression can be created in the
Outline of All Parameters in WB
Multiple Design Points can b
different values of the param
independent variable
Linked together &
Updated in background