1 2013 ANSYS, Inc. February 28, 2014 ANSYS Confidential

15.0 Release

Lecture 3:

Introduction to ANSYS Meshing

Introduction to ANSYS Meshing

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

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

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

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

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

7 2013 ANSYS, Inc. February 28, 2014 ANSYS Confidential

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

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

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.

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

11 2013 ANSYS, Inc. February 28, 2014 ANSYS Confidential

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

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

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

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

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

16 2013 ANSYS, Inc. February 28, 2014 ANSYS Confidential

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

17 2013 ANSYS, Inc. February 28, 2014 ANSYS Confidential

Workshop 3.1 Ansys WB Meshing Basics