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2-1ANSYS, Inc. Proprietary

2010 ANSYS, Inc. All rights reserved.Release 13.0

December 2010

Chapter 2

Introduction to Workbenchand CFX Workflow

Introduction to CFX

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Workbench and CFX Workf low



December 2010

Training ManualThe Workbench Environment

For most situations the Workbench GUI is divided into 2 primary

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

The Toolbox The Project Schematic

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December 2010

Training ManualThe Toolbox

The toolbox contains 4 subgroups:

Analysis systems:

Predefined templates that can be

placed in the schematic.

Component systems:

Various applications that can be

accessed to build, or expand,analysis systems.

Custom Systems:

Predefined analysis systems for

coupled applications (FSI, thermal-

stress, etc.). Users can also createtheir own predefined systems.

Design Exploration:

Parametric management and

optimization tools.

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December 2010

Training ManualThe Toolbox

The systems and components

displayed in the toolbox will

depend on the installed

products.

Using the check boxes in the

View All / Customizewindow, the items displayed

in the toolbox can be toggled

on or off.

The toolbox customizationwindow is normally left closed

when not in use.

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December 2010

Training ManualThe Project Schematic

The Workbench project schematic is a graphical representation of the

workflow 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 to

Workbench, meaning they run entirely in the Workbench window: Project Schematic, Engineering Data and Design Exploration

Non-native applications (called data-integrated) run in their own

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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December 2010


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

the schematic or simply double clicked.

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December 2010


In the example shown a

structural system is dragged anddropped onto a thermal system

at the Model cell (A4).

Before completing the operation

notice there are a number ofoptional drop locations that

will provide various types of

linkage between systems

(continued next page).

By dropping applications and/or analyses into various locations in

the schematic, an overall analysis project is defined.

Connectors indicate the level of collaboration between systems.

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December 2010


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.

Notice too each system block is given an alphabetic designation (A,

B, C, etc.).

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December 2010


By dropping the structural system at the Solution level we obtain a

structural system that is coupled to the thermal solution.

Notice, the candidate

drop location

indicates data will be

shared from fields A2

to A4, and

transferred from A6.

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December 2010


A schematic can also be constructed by RMB and choosing to

Transfer Data To New or Transfer Data From New.

In using the 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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December 2010


Identifying cell states:

Unfulfilled: missing upstream data.

Attention required: may need to correct this or upstream cells.

Refresh required: upstream data has changed. Need to refresh cell. An update

will also refresh the cell andregenerate any output data (e.g. mesh, results).

Update required: the data has changed and the output of the cell must be

regenerated.

Up to date.

Input changes pending: cell is locally up to date but may change when the next

update is performed due to upstream changes.

Interrupted: solver was manually stopped before it finished. Can use Resume

or Update to continue to solving.

Pending: a batch process is in progress

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December 2010

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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December 2010

Training ManualWorkbench File Management

Workbench creates a project file and a series of subdirectories to

manage all associated files.

Users should allow Workbench to manage the directories.

Please do NOT manually modify the content or structure of the project

directories.

When a project is saved a project file is created (.wbpj), using the

user specified file name (e.g. MyFile.wbpj).

A project directory will be created using the project name. In the

above example the directory would be MyFile_files.

A number of subdirectories will be created in the project directory.

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December 2010


From the Workbench View menu activate the

Files option to display a window containing file

details and locations.

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December 2010


Archive: quickly generates a single

compressed file containing all pertinent files.

File is zip format and can be opened using the

Restore Archive . . . utility in WB2 or any

unzip program.

Several options are available when archiving

systems as shown here.

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December 2010

Training Manual

CFX can be launched from:

The CFX 13.0 Launcher

Start > All Programs > ANSYS

13.0 > Fluid Dynamics> CFX >

ANSYS CFX 13.0

Within ANSYS Workbench

Drag Analys is Systems > Fluid

Flow (CFX)or ComponentSystems > CFXonto the

Project Schemat ic

The command line

More common under

Linux/Unix

Starting CFX

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December 2010

Training ManualTry It Yourself!

Now launch Workbench on your training machine

Start > All Programs > ANSYS 13.0 > ANSYS Workb ench

Expand the Component Systemstoolbox and add a CFXsystem to

the Project Schematic

Drag a second CFXsystem onto the Project Schematic, dropping it

onto the Solut ioncell of the first

The first Solution is used as the starting point for the second Solution,

e.g. a steady-state run followed by a transient run

Right-click on the Setupcell in the first system and select Edit

This will open CFX-Pre

You can leave CFX-Pre open for now

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December 2010

Training ManualRunning Standalone vs Workbench

Running CFX inside the Workbench environment:

Simplifies the workflow

Geometry, Mesh, Setup, Solution and Results steps shown on the Project

Schematic

Easier to update a project when a change is madeE.g. after a geometry change a single click updates the Mesh, Setup, Solution

and Results

Allows you to easily link to otherAnalysis Systemsand

Components

Is necessary when performing DesignExploration (parametric

studies)

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December 2010

Training ManualRunning Standalone vs Workbench

Running CFX standalone:

Less computational overhead

Produces a simpler directory / file structure on disk

But no direct association between geometry, mesh, setup and

results files

Each component must be updated

No built-in automation for parametric studies

Less automation

E.g mesh needs to be manually imported into CFX-Pre

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December 2010

Training Manual

Before starting a project you should set the working directory

Avoids files getting saved to Documents and Set t ings

From the CFX Launcher specify the Working Directorybefore starting

Pre / Solver / Post

In Workbench Savethe project before adding anything to the Project

Schematic

Setting the Working Directory

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December 2010

Training Manual

CFD-PostCFX-Pre CFX-Solver

Setup / CFX-Pre

General mode is the general purpose mode for definingall types of CFD simulations

When running in Workbench CFX-Pre will automatically start

in this mode

Turbomachinery mode simplifies the setup for rotatingmachines

Quick Setup mode greatly simplifies the physics setup for

a simulation by assuming many default parameters andbasic physics

Library Template mode provides a predefined setup forcomplex physics

Boiling, cavitation, coal & oil combustion,

In WB Editthe Setupentry to start

CFX-Pre Four types of simulation are available

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December 2010

Training Manual

Outline Tree

Viewer Window

Main Menu

Message Window

Viewer Toolbar

CFX-Pre Workspace

Main Toolbar


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December 2010

Training Manual

To define your simulation,

generally follow the Outline

tree from top to bottom

Double-click entries in the

Outline tree to edit

Right-click on entries in the

Outline tree to insert new

items or perform operations

Some items are optional,

depending on your

simulation

CFX-Pre WorkflowMesh and region contro l

Import, d elete,

t ransform meshes

View & edi t meshregions

Library objects

Option al. Referenced elsewhere in the setup

Import Materials & Reactions from libraries

provided

Insert Expressions, AVs, Fortran routines

Solver sett ings

Convergence contro ls

Resul ts f i les contro ls Numer ical schemes

Monitor points

Init ial isat ion

Star t ing point for the solver

in the absence of a previous

solut ion

Boundary Condi t ions

Domain

Right-cl ick to insert

boundary condi t ions

Analysis Type

Steady State / Trans ient


W kb h d CFX W kf l

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December 2010

Training ManualUseful Shortcuts

Viewer Toolbar

Rotate

Pan + CTRL

Zoom + SHIFT

Box Zoom

Rotate(on screen plane)

+ CTRL

(Hold while

tracing a box)

W kb h d CFX W kf l

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December 2010

Training Manual

1. Load Mesh

Right-click on Mesh

CFX-Pre Workflow Example

A Defaul t Dom ain is automat ical ly

created when the mesh is imported. It

contains al l 3D regions in the mesh.

Every domain contains a defaul t

boundary cond i t ion .


W kb h d CFX W kf l

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December 2010

Training Manual

2. Define Domain Properties

Right-click on the domain and pick Edit

Or right-click on Flow Analys is 1to insert a new domain


When edit ing an item a new tab p anel

opens contain ing the propert ies. You

can switc h between open tabs.

Sub-tabs contain

various different

propert ies

Comp lete the required

fields on each su b-tab

to define the domain

Optional f ields are

activated by enabling

a check box


W kb h d CFX W kf l

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December 2010

Training Manual

3. Create Boundary Conditions for a

Domain

Right-click on the domain to insert BCs


After complet ing

the boundary

condi t ion, i t

appears in the

Outl ine tree

below its dom ain


W kb h d CFX W kf l

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December 2010

Training Manual

4. Define Solver Settings

Right-click on Solver Control and pick Edit


Al l so lver

cont ro ls have

default values



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December 2010

Training ManualCFX-Pre Workflow Example

When running in Workbench: Just close CFX-Pre

Files are automatically saved

Check mark shown next to Setup

Right-click on Solut ionand

select EditorRefresh

Refresh runs the solver in thebackground with default settings

Editopens the Solver Manager

When running standalone: You should manually save the CFX-Pre

database

Right-click on Simulat ionand select Start

Solver>

Define Run opens the Solver Manager

Run Solverruns in the background with defaultsettings

Run Solver and Monitorrun with default settings

and monitors in the Solver Manager

5. Start Solver

Right-click

to solve



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December 2010

Training Manual

Defining a Run

CFX-Pre will have written a .def file

and this is automatically selected

as the Solver Inp ut Fi le

Can enable Initial Values check box

if you have a previous solution to

use as the starting point

Parallel settings are defined here

Allows you to divide a large CFD

problem so that it can run on more

than one processor/machine

Start Run!


CFX-Solver Manager


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December 2010

Training ManualCFX-Solver Manager

Solution Monitors

Monitor the convergence of

the solver

Plot residuals, imbalances,

monitor points, forces,

fluxes

Text output from the Solver

Lots of info in here

Can also view the .outfile ina text editor

WorkspaceCreate new monitors



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December 2010

Training ManualCFX-Solver Manager

When the Solver finishes, start

CFD-Post:

When running in Workbench:

Just close the Solver Manager

Check mark shown next to Solution

Right-click on Resultsand select

Editto start CFD-Post

When running standalone:

Enable Post-Process Resul tson the

solver finished notification window

Or select the Post-Process Resul ts

icon from the toolbar

Right-click

to start

CFD-Post



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December 2010

Training Manual

Outline Tree

Viewer Window

Details Pane


CFD-Post

Workspace

Outline tree

displays all post-

processing objects.

Right-click or

double-click to edit

in the Details Pane

Editor Tabs Outline

Variables

Expressions

Calculators

Turbo


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December 2010

Training Manual

General Workflow

1. Prepare locations where data

will be extracted from or

plots generated

E.g. Planes, Isosurface

2. Create variables/expressions

which will be used to extract

data (if necessary)

E.g. drag, pressure ratio

3. i) Generate qual i tat ivedata at

locations

ii) Generate quant i tat ivedata at

locations

4. Generate Reports

CFD-Post



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December 2010

Training ManualCFD-Post

CFD-PostCFX-Pre CFX-Solver1. Create Locations

2. Variables / Expressions

3. Qualitative and Quantitative data

4. Reports

Use the Locat ion

drop-down menu in

the toolbar to create

locations inside the

domain

2D & 3D domain,

boundary and

mesh regions are

automatically

available

Discussed in the Post-processing

lecture along with more details on

creating locations


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December 2010

Training ManualSummary of Common File Types

CFX-Solver

CFX-Pre

CFD-Post

.def(Solver Input or Definition File)

.cfx(CFX-Pre Database)

.wbpj(Workbench Project File)

.out(Solver Output File)

.res(Results File)

.cst(CFD-Post State File)

.cse(CFD-Post Session File).def, .cmdb(Mesh Files)

Import Mesh

.cmdb, .cfx5, .def, .res,

Open

.cfx, .def, .res


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December 2010

Training ManualSummary of Common File Types

.cfx files contain mesh andphysics data and can be opened

by CFX-Pre

.def files contain mesh andphysics data and can be run inthe Solver

.res files contain mesh, physicsand results data and can beopened in CFD-Post

CFX-Solver

CFX-Pre

CFD-Post

.def(Solver Input or Definition File)

.cfx(CFX-Pre Database)

.out(Solver Output File)

.res(Results File)

.cst

.cse.def, .cmdb(Mesh Files)

Import Mesh

.cmdb, .cfx5, .def, .res,

Open

.cfx, .def, .res

CFX-Pre can also open .def and .res files to recover the mesh and physics.Some unused data (e.g. unused Materials) is not written to the .def / .res files

and is therefore not recovered.

The CFX-Solver can use .res files to continue a run or as an initial guess

CFD-Post can also open .def and .cmdb files to view the mesh


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December 2010

Training ManualSolver Files and Folders

CFX-Solver

C:\Filename.def

C:\Filename_001.out

C:\Filename_001

C:\Filename_001\100_full.bak

C:\Filename_001\1.trn

C:\Filename_001\2.trnC:\Filename_001.res

First Time Solving

Filename.def

CFX-Solver

C:\Filename.def

C:\Filename_002.out

C:\Filename_002

C:\Filename_002\100_full.bak



C:\Filename_002.res

Second Time

Solving

Filename.def


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December 2010

Training ManualFile Structure in Workbench

When running CFX standalone, files are saved to your current

working directory

As noted on the previous side, some solver files are saved to a solver run

directory

When running in Workbench only the project file (.wbpj) is saved to

the current working directory

All other files are saved to a name_fi lessubdirectory

C:\StaticMixer.wbpj

C:\StaticMixer_files

Project files and folders. Do not edit directly


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December 2010

Training ManualLicense Preferences

Workbench license control is handled through the user interface

shown below, activated from the Workbench project page (Tools >

License Preferences . . . ).


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December 2010


With the available licenses displayed, the activation and use ordercan be specified using the up/down arrows.

0 = off, 1 = on

License order represents the preference order for license use.

The license control allows Workbench

users to specify whether a singlelicense is used when multiple

applications are open, or if all open

applications access their own license.


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December 2010


In the example shown, a user could have 3 Mechanical models open

simultaneously. Using the license control they may choose to open 3

licenses or use only 1 that is shared. In the shared scenario, only the activeMechanical session uses the license (the remaining will be read only).

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December 2010

ANSYS CFX 13.0Workflow Demo


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Training ManualWorkflow Demo

Your instructor will now perform a quick demonstration of the workflow in a

simple CFX project

This simulation sets up the Static Mixer simulation the first of the tutorials

supplied with the ANSYS CFX documentation

The mesh for this simulation can be found in the examples directory of your

CFX installation and can be imported as a CFX-Solver Input mesh file By default: C:\Progr am Files\ANSYS Inc\v130\CFX\examp les\Stat icMixer.def