snecma 14.5 l02 introduction to dm

Upload: ana

Post on 06-Jul-2018

224 views

Category:

Documents


1 download

TRANSCRIPT

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    1/28

    1 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    Lecture 2

    Introduction to Design Modeler

    Introduction to ANSYS Design

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    2/28

    2 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    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

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    3/28

    3 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    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

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    4/28

    4 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    Toolbars

    Tree Outline

    Mode Tabs

    Details View

    Status/Info Bar

    G

    W

    Entity Details Bar

    DesignModeler Interface

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    5/285 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    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

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    6/286 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    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

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    7/287 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    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

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    8/288 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    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

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    9/28

    9 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    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

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    10/28

    10 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    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

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    11/28

    11 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    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

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    12/28

    12 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    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

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    13/28

    13 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    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

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    14/28

    14 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    3D to 2D

    3D CAD3D CAD after

    Symmetry2D surfa

    Selection for Thin

    Surface / Faces to Keep

    Note : 2D models must be in XY plane

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    15/28

    15 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    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

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    16/28

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    17/28

    17 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    • 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

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    18/28

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    19/28

    19 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    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

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    20/28

    20 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    • 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

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    21/28

    21 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    • 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

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    22/28

    22 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    • 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

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    23/28

    23 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    • 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

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    24/28

    24 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    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

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    25/28

    25 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    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

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    26/28

    26 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    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

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    27/28

    27 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    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

  • 8/17/2019 SNECMA 14.5 L02 Introduction to DM

    28/28

    28 © 2013 ANSYS, Inc. March 27, 2014 ANSYS Confidential

    • 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