Mesh-Intro 15.0 L03 Introduction to Ansys Meshing
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Transcript of Mesh-Intro 15.0 L03 Introduction to Ansys Meshing
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1 2013 ANSYS, Inc. February 28, 2014 ANSYS Confidential
15.0 Release
Lecture 3:
Introduction to ANSYS Meshing
Introduction to ANSYS Meshing
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2 2013 ANSYS, Inc. February 28, 2014 ANSYS Confidential
Introduction to ANSYS Meshing
In this lecture we will learn:
Process for pre-processing using ANSYS tools
What is the ANSYS Meshing?
Meshing Fundamentals
How to launch ANSYS Meshing?
ANSYS Meshing interface
Geometry concepts
Meshing methods
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3 2013 ANSYS, Inc. February 28, 2014 ANSYS Confidential
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
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4 2013 ANSYS, Inc. February 28, 2014 ANSYS Confidential
What is ANSYS Meshing
ANSYS Meshing is a component of ANSYS Workbench
Meshing platform
Combines and builds on strengths of preprocessing offerings from ANSYS:
ICEM CFD, TGRID (Fluent Meshing), CFX-Mesh, Gambit
Able to adapt and create Meshes for different Physics and Solvers
CFD: Fluent, CFX and POLYFLOW
Mechanical: Explicit dynamics, Implicit
Electromagnetic
Integrates directly with other WB systems
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5 2013 ANSYS, Inc. February 28, 2014 ANSYS Confidential
Meshing Fundamentals
Purpose of the Mesh
Equations are solved at cell/nodal locations Domain is required to be divided into discrete cells (meshed)
Mesh Requirements
Efficiency & Accuracy Refine (smaller cells) for high solution gradients and fine geometric
detail.
Coarse mesh (larger cells) elsewhere.
Quality Solution accuracy & stability deteriorates as mesh cells deviate from
ideal shape
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6 2013 ANSYS, Inc. February 28, 2014 ANSYS Confidential
Meshing Process in Ansys Meshing
Physics, Sizing, Inflation, Pinch,
Sizing, Refine, Pinch, Inflation,
Preview surface mesh, Inflation
Mesh metrics, Charts
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Launching ANSYS Meshing
ANSYS Meshing is launched within Workbench 2 ways :
Fluid Flow (Fluent), Fluid Flow (CFX),
From Analysis Systems
Mesh
From Component Systems
Double click Mesh in the
System
or right click and select Edit
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8 2013 ANSYS, Inc. February 28, 2014 ANSYS Confidential
Graphics User Interface
Mesh Metrics
Graphics window
Section Planes
Manage views
Details view
Outline
Toolbars
Units Bar Entity Details Bar Message window
Worksheet
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9 2013 ANSYS, Inc. February 28, 2014 ANSYS Confidential
Outline
Three default sections
Geometry Bodies
Coordinate Systems Default global & user defined systems
Mesh Meshing operations (controls & methods)
displayed in the order in which they are inserted
In the tree
Right clicking on any object launches a context sensitive menu
Example: contains commands to generate, preview, clear mesh etc.
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10 2013 ANSYS, Inc. February 28, 2014 ANSYS Confidential
Details View
Accessing Object Details
Select an object (in the Outline) Related information to that object are displayed in the Details View below
Ex: Select a body (Fluid) in the Outline
Details of Fluid : contains graphical and geometric details
To access meshing details
Click the Mesh object or any of the inserted objects
The Details View provides options to review,
edit or
input
values for every object in the Tree
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Geometry Configuration Multiple Parts
Geometry composed of Multiple parts No connection between parts (no face sharing)
Contact Region is automatically created between 2 faces
Each part meshed independently
Results in Non-conformal interface. Meshes do not match. No nodes connection.
Independent faces
Grid interface - Fluent
GGI - CFX
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12 2013 ANSYS, Inc. February 28, 2014 ANSYS Confidential
Geometry Configuration Multi-body Parts
Geometry composed of multiple bodies in a part Depend on Shared Topology method (in DM)
None o Results in a none connection between the bodies (similar to multiple parts)
Automatic
Faces in contact imprinted & fused Form a single face shared between the 2 bodies
Results in Conformal mesh
Common face acts as Interior
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13 2013 ANSYS, Inc. February 28, 2014 ANSYS Confidential
Geometry Configuration Multiple body Parts
Geometry composed of multiple bodies in a part Imprints
Faces are imprinted on each other like faces
Contact Region is automatically created
non conformal interface
For identical mesh on these faces, use Match Control Results in unconnected mesh
Grid interface - Fluent
GGI - CFX
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14 2013 ANSYS, Inc. February 28, 2014 ANSYS Confidential
Meshing 3D Geometry
3D cell Types
First Meshing Approach
Part/Body based Meshing occurs at part or
body level. Meshing Methods are scoped
to individual bodies. Method assignment can be
automatic or manual. Bodies contained in one part
are conformally meshed.
Part/Body Methods Tetrahedrons.
Tetras only
Sweep. Prisms & hexahedrons
MultiZone. Mainly hexahedron
Hex Dominant Not for CFD
Automatic. Combines any types
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15 2013 ANSYS, Inc. February 28, 2014 ANSYS Confidential
Meshing 3D Geometry
Second Meshing Approach
Cut Cell Meshing Assembly Meshing Meshes an entire model in one
process. Assembly of parts
Performs boolean operations. Volume filling, intersection &
combination Does not require prior fluid body
definition or shared topology.
Conformal mesh created across parts.
Assembly Meshing
Methods Generate mainly
Hexahedrons Tetrahedrons
Part/Body Meshing & Assembly Meshing
not interoperable
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Summary
What have we learnt in this session:
The global process to run ANSYS Meshing
On overview of the interface and
The various Geometry configurations Multiple parts
Multi-body parts
Multiple body parts
Meshing methods Part/body based
Assembly meshing
And the associated
shared topology option
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17 2013 ANSYS, Inc. February 28, 2014 ANSYS Confidential
Workshop 3.1 Ansys WB Meshing Basics