mech-ht 120 lect-01 introduction

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Chapter 1

Introduction

1-1ANSYS, Inc. Proprietary 2009 ANSYS, Inc. All rights reserved. August 2009Inventory #002667

ANSYS MechanicalHeat Transfer


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Introduction

Training ManualWelcome! Welcome to theANSYS Workbench Mechanical Heat Transfertraining

course!

This training course covers the basics of using Mechanical in

performing thermal analyses. It is intended for all new or occasionalMechanicalusers, regardless

of the CAD software used.

Course Objectives:


e prerequ s te ntro uct on to ec an ca tra n ng or equ va entexperience) is assumed.

This course is intended to expand on the thermal analysis capabilitiesoutlined in the introductory course material.

Some ANSYS Mechanical APDL features not directly exposed in theMechanical application will be covered.

Those users wishing to work in the classic (Mechanical APDL) interface

should consider taking Introduction to ANSYS Parts 1 and 2 Training

courses.


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Introduction

Training ManualCourse Materials

The Training Manual you have is an exact copy of the slides

Workshop descriptions and instructions are included

Numerous other ANSYS product training courses are available

See the latest training course schedule and locations on the ANSYShomepage www.ansys.com



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Introduction

Training ManualCourse Outline Chapter 1 Introduction

About ANSYS Workbench Overview Starting Simulation Workbench Products

Chapter 2 Heat Transfer Fundamentals

Symbols and Conventions

Heat Transfer Basics Characteristics of FEA Thermal

Solutions Boundary Conditions Thermal Structural Comparisons Workshop 1

Chapter 4 Continued . . .

Model Setup

Steady State Example

Multiple Step Solutions

Workshop 3

Chapter 5 Nonlinear Thermal Analysis Nonlinear Theory Nonlinear Solution Setup Solution Feedback Workshop 4

Chapter 6 Transient Analysis


Approach Workbench Review Engineering Data Preprocessing in Mechanical Thermal Boundary Conditions Function Boundary Conditions Solution Setup Workshop 2

Chapter 4 Steady State ThermalAnalysis

Steady State Theory

Geometry Types

Thermal Elements

Time Stepping Transient Loading Transient Postprocessing Workshop 5

Appendix A1: Advanced Heat TransferTopics

ANSYS APDL Command Language Using Command Objects Named Selection Control

Surface to Surface Radiation Phase Change Workshop A1


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Introduction

Training ManualA. About ANSYS, Inc.ANSYS, Inc.

Developer of ANSYS family of products

Global Headquarters in Canonsburg, PA - USA (south of Pittsburgh)

Development and sales offices in U.S. and around the world

Publicly traded on NASDAQ stock exchange under ANSS



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Introduction

Training Manual ANSYS Family of ProductsANSYS Family of Products Analysis Capabilities:

Structural Mechanics

Fluid Dynamics

Explicit DynamicsElectromagnetics

Coupled Mutiphysics Analyses

Simulation Process and Data Management



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Introduction

Training Manual ANSYS Channel Partners

ANSYS Channel Partners

Sales and support network for ANSYS

Over 75 offices worldwide Local expertise for ANSYS consulting and training



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Introduction

Training ManualB. ANSYS Workbench Overview

What is ANSYS Workbench?

ANSYS Workbench provides powerful methods for interacting with theANSYS family of solvers.

ANSYS Workbench bi-directional parametric integration with CADsystems as well as supporting an entire range of CAD data sharing.

ANSYS Workbenchis comprised of various applications (someexamples): Mechanical for performing structural and thermal analyses using the ANSYS

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2009 ANSYS, Inc. All rights reserved. August 2009Inventory #002667

.

Geometry (DesignModeler) for creating and modifying CAD geometry to preparethe solid model for use in analysis applications.

Meshingfor generating Structural and CFD meshes.

Advanced CFDusing the Fluent and CFX solvers.

Design Explorationfor optimization.

Finite Element Modeler (FE Modeler) for translating a NASTRAN and ABAQUS

mesh for use in ANSYS. AUTODYN for explicit dynamics simulations featuring modeling of nonlinear

dynamics.


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Introduction

Training ManualC. ANSYS Mechanical Overview Analysis types available in Mechanical:

Structural (static and transient):

Linear and nonlinear structural analyses.

Dynamic Capabilities:

Modal, harmonic, random vibration, flexible and rigid dynamics.

Heat Transfer (steady state and transient):

Solve for temperature field and heat flux. Temperature-dependentconductivity, convection and materials allowed.


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Magnetostatic: Performs 3-D static magnetic field analysis.

Design Optimization:

Perform design of experiments and six sigma optimizations.

Indicates preferred designs using goals driven optimization techniques.


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Introduction

Training ManualD. Starting Mechanical There are two methods of launching Workbench:

From the Windows start menu:



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From the CAD system


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Introduction

Training ManualE. The Workbench Environment For most situations the Workbench GUI is divided into 2 primary

sections (there are other optional sections well see in a moment):



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The Toolbox The Project Schematic


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Introduction

Training ManualThe Toolbox The toolbox contains 4 subgroups:

Analysis systems: predefinedtemplates that can be placed in theschematic.

Component systems: various

applications that can be accessedto build, or expand, analysis

systems.



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us om ys ems: pre e ne

analysis systems for coupledapplications (FSI, thermal-stress,etc.). Users can also create their

own predefined systems.

Design Exploration: Parametric

management and optimizationtools.


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Introduction

Training Manual. . . The Toolbox The systems and components

displayed in the toolbox willdepend on the installed

products Using the check boxes in the

View All / Customizewindow, the items displayedin the toolbox can be to led



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on or off The toolbox customization

window is normally left closedwhen not in use


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Introduction

Training ManualThe Project Schematic

The Workbench project schematic is a graphical representation of theworkflow defining a system or group of systems

The workflow in the project schematic is always left to right

There are currently several applications which are native toWorkbench, meaning they run entirely in the Workbench window:

Project Schematic, Engineering Data and Design Exploration

Non-native a lications called data-inte rated run in their own



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window: Mechanical (formerly Simulation), Mechanical APDL (formerly ANSYS),

ANSYS Fluent, ANSYS CFX, Etc . . .

Blocks of cells can be deleted by RMB menu selection


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Introduction

Training Manual. . . The Project Schematic In this example a Static Structural analysis type is selected for the project

schematic

From the toolbox the selection can be dragged and dropped onto theschematic or simply double clicked



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Introduction

Training Manual. . . The Project Schematic By dropping applications and/or systems into various locations in the

schematic, an overall analysis project is defined

Connectors indicate the level of collaboration between systems

In the example below a structural system is dragged and droppedonto a thermal system at the Model cell (A4)

Before completing the operation notice there are a number ofoptional drop targets that will provide various types of linkage


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Introduction

Training Manual. . . The Project Schematic By completing the operation from the previous page, notice the

linkage here is only at the Model level and above

In this case there would be no thermal/structural coupling



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Notice too each system block is given and alphabetic designation (A,B, C, etc.)


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Introduction

Training Manual. . . The Project Schematic By dropping the structural system at the Solution level we obtain a

structural system that is coupled to the thermal solution



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Notice, the CandidateDrop Target

Indicates Data will be

Shared from FieldsA2 to A4, and

Transferred from A6


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Introduction

Training Manual. . . The Project Schematic A schematic can also be constructed by RMB and choosing to

Transfer Data To New or Transfer Data From New

In using this RMB transfer feature all transfer possibilities (upstream

and downstream) are displayed These selections will vary depending on which cell in a particular

system you highlight

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Introduction

Training ManualOptional Workbench Windows The View menu (and RMB) allows additional information to be

displayed in the Workbench environment

Below, the geometry is highlighted and the properties are displayed

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Introduction

Training ManualF. Workbench File Management Workbench creates a project file and a series of subdirectories to

manage all associated files.

Users should allow Workbench to manage the content of these

directories. Please do NOT manually modify the content or structureof the project directories.

When a project is saved a project file is created (.wbpj), using theuser specified file name (e.g. MyFile.wbpj).

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above example the directory would be MyFile_files. A number of subdirectories will be created in the project directory

(explained next).


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Introduction

Training Manual. . . Workbench File Management Archive: quickly generates a single

compressed file containing all pertinent files

File is zip format and can be opened using theRestore Archive . . . utility in WB2 or anyunzip program

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Several options are available when archivingsystems as shown here


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Introduction

Training ManualG. Working With Units The Units menu in Workbench:

Allows access to predefined unit systems

Allows the creation of custom unit systems

Controls unit display for Engineering Data,

Parameters and Charts Activate the Units System dialog to control

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Units can be Displayed in theActive Project System or asThey were Defined in TheirSource (e.g. CAD System)


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Introduction

Training Manual. . . Working With Units Create custom unit systems by duplicating existing systems then

modifying

Custom unit systems can be exported and imported

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Introduction

Training Manual. . . Simulation Overview The Simulation GUI is Tree-Driven:

Depending on what ishighlighted on the OutlineTree, the available options inthe Context Toolbar andDetails View will change. TheGra hics Window will also

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update to reflect the part of the

branch selected.

The Tree represents thedifferent aspects of thesimulation.

All Workbench modules are

Tree-Driven, so navigationthrough the GUI is donethrough selecting differentbranches of the Tree.


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Workshop 1 ThermalBar

mech-ht 120 lect-01 introduction

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