CFD Review  
Serving the CFD Community with News, Articles, and Discussion
 
CFD Review

User Preferences
Site Sponsorship
Headline Feeds
Mobile Edition
Privacy Policy
Terms of Service
twitter

Submit a CFD Story

Site Sponsors
CD-adapco
Pointwise: Reliable CFD meshing
ANSYS

Tell a Friend
Help this site to grow by sending a friend an invitation to visit this site.

CFD News by Email
Did you know that you can get today's CFD Review headlines mailed to your inbox? Just log in and select Email Headlines Each Night on your User Preferences page.

 
Application: CFD Aids Development of New Casting Process
Posted Fri November 15, 2002 @05:24PM
Print version Email story Tweet story
Application By Thomas Staubli and Antonio Di Miele,
HTA Lucerne,
University of Applied Sciences of Central Switzerland

The production of metal strip by pouring molten steel between two rotating cylinders was first attempted in the 19th century. But it has taken the development of new materials and coatings, and newly acquired expertise in cooling and automation to make the process viable. The technology is now developing at a fast pace worldwide, and pioneer plants are providing first results. Economically, the process is extremely attractive, since smaller amounts of sheet metal can be produced locally and, with a minimum amount of subsequent working, very cost-efficiently.

The process employs two counter-rotating parallel rolls, against who's cooled surfaces the molten steel solidifies. Solidification begins just below the meniscus and shell growth continues as it moves downwards through the melt pool. At the kissing point, the two shells are essentially fused together forming a continuous strip, which then exits the caster downwards. Since the melt pool is small compared to that in conventional casters, the metal delivery has to be treated very carefully and good flow conditions in the melt pool are essential for faultless strip quality. Conventional delivery nozzles cannot be used, as inhomogeneity of flow in the melt pool is reflected in the strip quality. Similarly, the meniscus of the liquid steel must be stable, as any disturbance, wave or vortex at the free surface leads to unstable solidification and defects in the strip.

( Read Full Article | Application )


Application: CFD Helps Optimize Design of Innovative Rocket Motor
Posted Wed November 13, 2002 @09:34AM
Print version Email story Tweet story
Application Chuck Margraves
Mechanical Engineer
Stone Engineering
Huntsville, Alabama

One of the most difficult challenges in pintle-controlled rocket design is configuring the nozzle so the gas pressure at the nozzle exit is equal to the outside air pressure in order to maximize thrust. Engineers at Stone Engineering Company (SEC) in Huntsville, Alabama, are reducing design time and cost by using computational fluid dynamics (CFD) rather than physical testing to determine the optimum configuration. CFD allows us to look inside our design to gain a far greater understanding than we were ever able to achieve with physical testing results alone in the past. The result is that we can see exactly where flow separation occurs for various nozzle geometries and fine-tune our design to maximize thrust under a wide range of flow conditions.

SEC provides technical support to the U.S. Army Missile Command and Space and Strategic Defense Command in the areas of propulsion and structures. The company has extensive "hands-on" experience in the analysis, design, development, and testing of solid, liquid, hybrid, and gel propulsion systems, metallic and composite structures, and gas generators. Extensive capabilities in structural analysis, ballistic prediction, combustion instability analysis, as well as an in-depth understanding of the requirements for today's systems place SEC in a position to move forward in our fields of expertise. One of our most interesting current projects is a bipropellant gel rocket engine that uses an axial pintle to control the throat area and hence the motor thrust. The use of the movable pintle to control the throat area provides the potential to promote higher efficiency in the lower-thrust sustain phase of the motor burn, and provides a flexible response to the requirements of the application.

( Read Full Article | Application )


Application: CFD Helps Improve Torque Converters
Posted Tue November 12, 2002 @08:15AM
Print version Email story Tweet story
Application By Youssef Dakhoul
Caterpillar Transmission Business Unit
USA

Caterpillar is a world leader in the manufacture of heavy equipment such as track-type tractors, wheel loaders and off-highway trucks, all requiring highly sophisticated torque converters in their power transmission devices. In its Transmission Business Unit (TBU), which designs and manufactures these torque converters, engineers use CFD to evaluate a wide range of possible designs to reach the best possible efficiency, quality and durability at the lowest possible cost.

The most crucial components of a torque converter are the impeller, turbine and stator wheels, which are arranged in a closed loop. Finding the correct blade shapes is a major iterative effort involving: 3-D blade geometry specification, 1-D converter performance and thrust prediction, and 3-D CFD analysis of the oil flow in the converter.

We use CFX-TurboGrid and CFX-TASCflow for our CFD analysis. CFX-TurboGrid’s ‘templates’ greatly reduce our grid generation effort and allow us to create high-quality 3-D grids for the three bladed passages with minimum effort.

( Read Full Article | Application )


Events: Fluent offers Free Engine Simulation Seminar
Posted Mon November 11, 2002 @04:45PM
Print version Email story Tweet story
ANSYS FLUENT Pushing the Envelope in Engine Simulation
A one-day Seminar on Friday, December 13th from 10:00am to 2:30pm at the Hewlett Packard Facility in Novi, Michigan.

Fluent Inc., Optimum Power, and Hewlett Packard have come together to present a free workshop featuring the latest technology in engine modeling. By coupling the innovative 1D gas dynamics modeling capabilities within VIRTUAL ENGINES with the full 3D moving mesh simulations in FLUENT6, you can apply "the best of both worlds" to your own modeling process, which means more accurate simulations used earlier in the design cycle.

To find out more about this workshop and about your chance to see live demonstrations of the products, learn about new and upcoming functionality and see industrial validation cases, visit: http://www.fluent.com/solutions/automotive/seminar /

We look forward to meeting you!

( Post Comment | Events )


New Software: EASA Version 2 Released
Posted Mon November 11, 2002 @04:06PM
Print version Email story Tweet story
ANSYS CFX AEA Technology has announced Version 2.0 of EASA (Enterprise Accessible Software Applications) that provides substantial improvements in its ability to provide simplified access to complex technical software.

“EASA provides an intuitive Web-based environment through which users can access any software application, commercial or in-house. This makes it possible to expand access to a company’s software tools without providing specialized user training and greatly simplifying deployment and maintenance,” said Sebastian Dewhurst, Vice President, Enterprise Applications for AEA Technology Engineering Software. The new version offers the ability to include 3D graphics within the custom applications created in the EASA environment. It also provides several new user interface options and a graphical tool that greatly simplifies linking the EASA applications to underlying software. Finally, EASA 2.0 includes a new optimization module that automatically searches a defined parametric space for the optimal solution as defined by the user.

( Read Full Article | New Software )


Application: Electronic Cooling Simulation Helps Reduce Design Time
Posted Mon November 11, 2002 @11:45AM
Print version Email story Tweet story
Application By Dr. Samir El-Khabiry
Hamilton Sundstrand
Rockford, Illinois

Electronics cooling simulation is helping a major aerospace manufacturer reduce design time while minimizing system weight. Thermal management is important for safe and reliable operation of all electronic equipment, and is especially so for airborne systems. Yet it can take several months and cost on the order of $10,000 to build and test a single prototype for certain equipment. For Hamilton Sundstrand, a maker of power modules for aerospace and marine applications, these obstacles have been overcome by using computational fluid dynamics (CFD) software to evaluate the effectiveness of different designs. By using simulations to better understand the airflow within each proposed device, engineers can determine the best methods for heat removal before the first prototype is built. In this manner, the company can often find novel ways to improve thermal management while reducing component weight.

During the past several years in all sectors of the electronics business, system functionality has been steadily increasing while system size has been steadily decreasing. The combination of these trends has led to a steady increase in the amount of heat generated per unit volume. Removing internally generated heat requires an effective path along which the heat can flow from the heat-dissipating components to the surroundings. To meet this need, a variety of cooling techniques is available to design engineers including, for example, conduction, natural convection, forced-air cooling, radiation cooling, and liquid cooling. Selecting and eventually optimizing thermal management has relied on, traditionally, building a series of physical prototypes using different cooling methods, and measuring the performance of each.

( Read Full Article | Application )


 
CFD Review Login
User name:

Password:

Create an Account

CFD Image Gallery
Click for full image

Quick Links
CFD Events | Calendar
CFD Jobs
(3 jobs)
CFD Links

CFD Vendors
ACUSIM
ANSYS
Avizo Wind
AVL
Blue Ridge Numerics
CD-adapco
CEI Software
CPFD Software
Daat Research
ESI Group
Exa
Intelligent Light
Flow Science
Mentor Graphics Mechanical
Metacomp Technologies
Numeca
Pointwise
Simerics
Software Cradle
Tecplot

Features
  • Interview with the Head of CFX Engineering Software Development
  • A Visit Inside CFX Engineering Software
  • Endangered Fish Benefit from CFD
  • Optimization of Marine Components Using CFD
  • A Case for Application-Specific CFD Meshing
  • Are Structured Methods Still The Workhorse?
  • Do GUIs Help or Hurt?
  • How Multigrid Solver Acceleration Works
  • CFD Modeling of an Internal Rotary Pump
  • State of the Art in Grid Generation
  • Older Stuff

    Thursday November 07

  • Blue Ridge Numerics Announces Release of CFdesign v6.0 (0)
  • Tuesday November 05

  • Fluent to Use PTC's Geometry Kernel (0)
  • Monday November 04

  • A New CFD Haiku (0)
  • We Have Our Winner! (0)
  • Friday November 01

  • Virtual Vantage V3.1 Released (0)
  • Thursday October 31

  • New Tool Automates CFD Studies (0)
  • World-wide Survey on the State of Finite Element Analysis (0)
  • Wednesday October 30

  • Fluent Releases IcePro 3.1 (0)
  • Monday October 28

  • Possible Aquisition of Flomerics (0)
  • Friday October 25

  • Amtec Announces Tecplot V9.2 (0)
  • CFD Powers Fuel Cell Development (0)
  • Tuesday October 22

  • Fuel Cell Web Presentations Offered (0)

  • Older Articles
    Yesterday's Edition

    Why you say you no bunny rabbit when you have little powder-puff tail? -- The Tasmanian Devil All content except comments
    ©2014, Viable Computing.

    [ home | submit story | search | polls | faq | preferences | privacy | terms of service | rss  ]