fluid-analysis-solutions-12.1.pdf

Fluid Analysis Solutions

12.1 RELEASE

C omputational fluid dynamics (CFD) is an engineering method in which flow

fields and other physics are calculated in detail for an application of interest.

The CFD, or fluid simulation, results can be used as part of a Simulation

Driven Product Development™ (SDPD) process to illustrate how a product

or process operates, to troubleshoot problems, to optimize performance and to design

new products.

With a large commercial and academic user base, along with a fluid simulation product

line that is both broad and deep, ANSYS, Inc. is an industry leader and technological

champion for commercial engineering simulation.

ANSYS FLUENT software is integrated

into ANSYS Workbench for efficient design

optimization. This model shows the flow

around a football.

As with most advanced technologies, there has been a long evolutionary path from the

inception of CFD to today’s integration of this technology into SDPD processes. This

progression occurred as ANSYS moved beyond providing advanced mathematical flow

solvers. ANSYS now uses a multiphysics approach to simulation in which fluid flow

models integrate seamlessly with other types of physics simulation technologies. The

ANSYS vision is clear: to provide a system of high-fidelity multiphysics analysis tools to

truly enable SDPD using the adaptive and unified ANSYS ® Workbench™ architecture.

The ANSYS Workbench platform integrates a large variety of technology choices

tailored to meet individual needs, while ensuring interoperability and a clear future

upgrade path. This includes a very broad fluid simulation product line from ANSYS, with

the products falling into two categories: general-purpose fluid flow analysis and specialty

products. The breadth and depth of the ANSYS fluid dynamics portfolio is unparalleled.

General-Purpose CFD Solvers

ANSYS CFD technology provides access to both the well-known ANSYS ® FLUENT ® and

ANSYS ® CFX ® products. Also available separately, these are the main general-purpose

fluid simulation products offered by

ANSYS. These two solvers were

developed independently over

decades and have a number of

things in common, but they also

have some significant differences.

Both are control-volume based for

high accuracy and rely heavily on a

pressure-based solution technique

for broad applicability. They differ

mainly in the way they integrate the

fluid flow equations and in their

equation solution strategies.

Contours of temperature on a car body

calculated in ANSYS FLUENT technology

Automotive in-cylinder flow modeled with

ANSYS CFX software

ANSYS CFX software is fully integrated in ANSYS

Workbench. This biomedical aneurysm model shows

the stresses in an artery wall.

www.ansys.com

The ANSYS CFX solver uses finite elements (cell vertex numerics), similar to those used

in structural analysis, to discretize the domain. In contrast, the ANSYS FLUENT solver uses

finite volumes (cell-centered numerics). Ultimately, though, both approaches form “control

volume” equations that ensure exact conservation of flow quantities, a vital property for

accurate CFD simulations. ANSYS CFX software focuses on one approach to solve the

governing equations of motion (coupled algebraic multigrid), while the ANSYS FLUENT

product offers several solution approaches (density-based, and both segregated and

coupled pressure-based methods). Both solvers contain a wealth of physical modeling

capabilities to help ensure that any fluid dynamics simulation has all of the modeling

fidelity required.

Airflow in a data center calculated by ANSYS ®

Airpak ® software

Furthermore, ANSYS ® CFD-Flo TM software addresses the fluid flow analysis needs of

designers who work on the front lines of their company’s product-development process.

The ANSYS CFD-Flo tool limits the physics accessible by the user to the models

most commonly used by design engineers. It is compatible with other applicable

ANSYS Workbench add-ins. The reduced complexity and cost of ANSYS CFD-Flo

software make it a good choice for design departments.

ANSYS CFD software is highly scalable. Product development times can be shortened with

ANSYS CFD HPC, the high-performance computing option. This allows performing large

model calculations on parallel computing clusters. Linear scalability has been shown on

systems with more than 1,000 processors.

The ANSYS fluid simulation solvers represent more than 1,000 person-years of research

and development. This effort translates into the key benefits of fluid simulation software

from ANSYS: experience, trust, depth and breadth. The CFD core solvers from ANSYS are

trusted, used and relied upon by companies worldwide.

Static mixer simulation in ANSYS fluid

dynamics software

Specialty Fluid Analysis Tools

Flexibility and generality are important, but sometimes not

required for certain specific applications. In addition to providing

general-purpose fluid simulation, ANSYS makes fluid simulation

even more accessible and focused with its specialty fluid analysis

tools. These products are often called vertical applications

because of the way they integrate all the steps for the analysis

of a specific type of system into one package. The technologies

offer industry-specific functions as well as employ the language

of the industry in which they are used.

Polyhedral mesh of a race car as used with

ANSYS FLUENT software. The use of

polyhedral meshes speeds up many

simulations.

Turbomachinery is one of the world’s single most successful

fluid dynamics vertical applications — due to the similarity

of the geometry and physics across a broad range of rotating

machinery sectors. Turbosystem technology from ANSYS

includes custom geometry and meshing tools as well as

special modes within the general-purpose fluid simulation tools.

ANSYS ® Icepak ® software is a family of products focused on

electronics design and packaging. In order to improve the

performance and durability of electronic boards and other

Multiphase mass fractions in a three-

phase bubble column as analyzed

with ANSYS FLUENT software

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12.1 RELEASE

components during the design of optimized cooling

systems, the product calculates the flow field and

temperatures in electronics and computer systems.

ANSYS ® POLYFLOW ® software is focused on the

needs of the materials industry, such as polymer

processing, mold filling, thermoforming and glass

production. It can model the flow of fluids with

very complex behavior, such as viscoelastic fluids.

ANSYS POLYFLOW technology offers unique

features, such as the ability to perform reverse

calculations to determine the required die shapes

in extrusion. It also can calculate the final wall

thickness in blow-molding processes.

ANSYS CFX is commonly used to

model complex turbomachinery.

The ANSYS Airpak product is aimed at the design of heating, ventilation and cooling

systems in buildings such as offices, factories, stadiums and other large public spaces. It

accurately and easily models airflow, heat transfer, contaminant transport and thermal

comfort in a ventilation system.

The fluid flow in a pipe-junction modeled

with ANSYS CFX technology

Geometry courtesy of CADFEM

FLUENT ® for CATIA ® V5 software brings fluid flow and heat transfer analysis into the

CATIA V5 product lifecycle management environment. The fluid flow physics available

are most commonly used by design engineers. It is fully compatible with the

ANSYS FLUENT product.

Finally, end users can create their own vertical applications within the general-purpose

fluid simulation products. ANSYS CFX software offers user-configurable setup wizards

and expression language. ANSYS FLUENT technology provides user-defined functions.

Combined with the scripting tools available in the other ANSYS Workbench based

applications, these can be used to create custom vertical applications. It is not uncommon

for an analysis department to create such vertical applications for deployment within a

design department. The main benefit of this approach is to ensure repeatable simulation

process control and, hence, quality control for any fluid dynamics process.

Contours of drug concentration in a stent

and capillary wall as predicted by ANSYS

FLUENT technology

The Benefits of Fluid Simulation from ANSYS

ANSYS fluid flow analysis technology allows for an in-depth analysis of the fluid

mechanics in many types of products and processes. Not only does it reduce the need

for expensive prototypes, it provides comprehensive data that is not easily obtainable

from experimental tests. Fluid simulation can be used to complement physical testing.

Some designers use it to analyze new systems before deciding which validation tests,

and how many, need to be performed. When troubleshooting, problems are solved

faster and more reliably because fluid dynamics analysis highlights the root cause, not

just the effect. When optimizing new equipment designs, many what-if scenarios can be

analyzed in a short time. This can result in improved performance, reliability and product

consistency. ANSYS will continue to innovate and integrate so that customers can

replace more of their traditional capital-intensive design processes with a Simulation

Driven Product Development method.

Wave formation around a ship hull modeled

with ANSYS CFX software

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12.1 RELEASE

The ANSYS Advantage

With the unequalled depth and unparalleled breadth of engineering simulation

solutions, companies are transforming their leading-edge design concepts into innovative

products from ANSYS and processes that work. Today, 97 of the top 100 industrial

companies on the “

Global 500” invest in engineering simulation as a key

strategy to win in a globally competitive environment. They choose ANSYS as their

simulation partner, deploying the world’s most comprehensive multiphysics solutions to

solve their complex engineering challenges. The engineered scalability of our solutions

delivers the flexibility customers need, within an architecture that is adaptable to the

processes and design systems of their choice. No wonder the world’s most successful

companies turn to ANSYS — with a track record of almost 40 years as the industry

leader — for the best in engineering simulation.

FORTUNE

ANSYS POLYFLOW is commonly used

in thermoforming and blow-molding

applications. This example shows the final

thickness of a thermoformed dashboard

component.

The moving mesh technology in ANSYS FLUENT software is used to model

the changing tilt of the rotorcraft’s wings while changing flight modes.

The extrusion of a viscoelastic food

material is simulated with ANSYS

POLYFLOW software. The pressure drop

between the inlet and the five outlets is

shown.

FLUENT for CATIA V5 software works

within the CATIA V5 PLM environment,

as shown in this simulation of a heat

exchanger.

ANSYS CFD-Post software provides powerful quantitative and graphical post-processing

and reporting capabilities. The performance of different designs can be compared

with ease, enabling efficient design optimization.

www.ansys.com

ANSYS, Inc.

Southpointe

275 Technology Drive

Canonsburg, PA 15317

U.S.A.

724.746.3304

ansysinfo@ansys.com

Toll Free U.S.A./Canada:

1.866.267.9724

Toll Free Mexico:

001.866.267.9724

Europe:

44.870.010.4456

eu.sales@ansys.com

ANSYS, ANSYS Workbench, HPSS, AUTODYN, CFX, FLUENT and any and all ANSYS, Inc. brand,

product, service and feature names, logos and slogans are registered trademarks or trademarks of

ANSYS, Inc. or its subsidiaries in the United States or other countries. ICEM CFD is a trademark used

under license. All other brand, product, service and feature names or trademarks are the property of

their respective owners.

Image Credits: Some images courtesy FluidDA nv, Forschungszentrum Joülich GmbH, Heat Transfer

Research, Inc., Riello SPA and iStockphoto.com

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