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Application: CFD Aids Space Station Lifeboat Design
Posted Tue July 13, 2004 @03:33PM
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Application By Brad Eckhardt, Lockheed Martin Space Operations, Houston, Texas
Laith Zori, Fluent Incorporated, Lebanon, New Hampshire

The use of computer simulation to help build it right the first time is one major reason why the estimated costs of building the X-38, also known as the “lifeboat” for the International Space Station, are less than one-tenth the cost of previous space vehicles. In one typical example, Lockheed Martin engineers are using CFD software to ensure the effectiveness of the climate control system of the space vehicle. The engineers built a computer model of the X-38 and its contents, and used CFD to simulate the airflow and heat transfer throughout the vehicle’s cabin, eliminating the costs of building and testing a physical prototype. Preliminary simulations showed some areas with potential ventilation problems due to equipment blocking airflows.

NOTE: The X-38 project is currently suspended and is under review as a result of funding issues associated with the International Space Station (ISS).

The X-38 is designed for use on the International Space Station (ISS) as an emergency crew return vehicle (see Figure 1.). It is for this purpose that the term "lifeboat" is used. One of the goals of the X-38 program is to build a human spacecraft for an order of magnitude less cost than ever before. In the late 1980’s, prior to the X-38, one crew return vehicle project was estimated to cost as much as 2 billion dollars. The X-38 project is expected to build and test fly two prototypes in space for 90 million dollars. Several factors will contribute to the reduced cost. For example, the X-38 uses a lifting body design derived from the U.S. Air Force's X-24A experimental project in the mid-1960’s. Additionally, parts of the X-38 will be bought over the counter, using existing, rather than newly designed technology - a marked difference from past NASA spacecraft.

( Read Full Article | Application )

Events: STAR-CD French User Conference
Posted Mon July 12, 2004 @10:23AM
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CD-adapco CD adapco France annonce sa Conférence Utilisateurs sur le site de Renault F1 Team France

Rejoignez-nous à la Conférence STAR-CD 2004 qui se tiendra le 28 septembre 2004 dans le cadre exceptionnel du Centre d’essai de Viry-Châtillon de l’Ecurie Renault F1 Team!

Lors de cette journée, vous découvrirez notamment comment les Solutions CD adapco pour la Mécanique des Fluides Multi-physiques s’intègrent au sein de l’équipe d’ingénieurs de Renault F1 Team et répondent aux exigences du monde très concurrentiel et de haute technicité que symbolise la Formule 1.

Plusieurs autres utilisateurs des solutions CD adapco présenteront également leurs activités dans des domaines tels que l’énergie, l’électroménager, le transport, le bâtiment, l’aérospatial, la chimie…

  • Vous pourrez aussi découvrir et essayer les derniers produits de CD adapco basés sur: l’intégration CAO
  • la version STAR-CD 3.20 avec de nouveaux modèles
  • la nouvelle génération de Solveur Couplé STAR-CCM+
  • le développement d’outils « Métiers »

Nos ingénieurs et développeurs seront disponibles tout au long de la journée pour répondre à vos questions.

La possibilité sera offerte à tous les participants d’assister le 29 septembre 2004 à une journée d’initiation aux outils de calculs. Des stations de travail seront mises à votre disposition pour illustrer de façon concrète nos outils : souplesse de STAR-CD intégrée sous votre environnement CAO, rapidité et précision de la nouvelle technologie STAR-CCM+.

( Read Full Article | Events )

Events: CFD Workshop & Training Programme
Posted Mon July 12, 2004 @10:04AM
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Announcements The Centre for Development of Advanced Computing (C-DAC), Pune and the IITZeus group of the Indian Institute of Technology, Bombay (IITB), are jointly organizing a five-day workshop and training programme on CFD during Aug 23 to 27, 2004.

The workshop will cover expert lectures on the fundamental aspects of Computational Fluid Dynamics (CFD), e.g., grid generation techniques, compressible & incompressible flow, boundary layer, turbulence modeling, multiphase flow, conjugate heat transfer, numerical discretization schemes and solution methods. The lectures will also highlight the application aspects of CFD in industries and environmental & water resource engineering.

The training will involve hands on sessions on CFDTutor, CFDExpert and PHOENICS.

For programme details, kindly contact:

Centre for Development of Advanced Computing (C-DAC)
Pune University Campus, Ganesh Khind Rd., Pune 411 007, India.
Tel: +91- 20- 2569 4000/1/2/3, (EPABX) Ext. 504, 2569 0542
Fax: +91- 20-2569 4081
Contact Person : Uma Shankar

Updated [12 July 2004]:
The seminar website is now available with more information.

( Post Comment | Events )

Research: Density Functional Theory Simplifies Multiphase Simulation
Posted Fri July 09, 2004 @10:19AM
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News Traditional Eulerian multiphase simulation suffers from numerical problems at phase interfaces due to the large local density variation (eg. 1000:1 for water/air). The result is numerical instability and the need for a highly refined mesh at the (usually unknown/moving) interface location.

Density functional theory, however, describes the multicomponent multiphase mixture continuously without density jumps at interfacial surfaces. This is achieved by the introduction into the Helmholz energy, or into the entropy, square component density gradient terms. As a result the hydrodynamics of multiphase mixtures is described in a unified way meaning the governing system of equations is the same at any point in space.

( Post Comment | Research )

New Software: Open Source Tetrahedral Mesh Generator Available
Posted Thu July 08, 2004 @02:14PM
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Grid Generation TetGen version 1.3, a quality tetrahedral mesh generator and 3D Delaunay triangulator, has been released.

TetGen generates exact Delaunay tetrahedralizations, constrained Delaunay tetrahedralizations, and quality tetrahedral meshes. The latter are quality conforming Delaunay and nicely graded if no input angle is smaller than 60 degree.

The development of TetGen is supported by the pdelib project of Weierstrass Institute for Applied Analysis and Stochastics in the research group of Numerical Mathematics and Scientific Computing.

( Post Comment | New Software )

Events: NAFEMS World Congress 2005 - Call for Papers
Posted Thu July 08, 2004 @02:04PM
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Announcements NAFEMS, the International Association for the Engineering Analysis Community, will hold its 10th World Congress on the island of Malta from the 17th – 20th May 2005. The conference will bring together world leading industrial practitioners, consultancies, academic researchers and software developers with a common interest in engineering analysis, finite element analysis, and computational fluid dynamics. The event will provide an exclusive insight into established methods and best practices, along with a vision of how future technologies will have an increasing impact on the product development process.

NAFEMS are now inviting submission of papers for inclusion in the Congress programme. Papers are being accepted from all areas of engineering simulation, under the following broad headings:

  • Practical Applications of Simulation
  • Analysis as an Engineering Tool
  • Simulation Techniques & Technologies
  • Successful use of Analysis through Effective Training
  • Numerical Methods

With a reputation for technical excellence and innovation, the NAFEMS World Congress is the ideal forum to share experiences, exchange ideas, and gain recognition for innovative work in the simulation field.

( Read Full Article | Events )

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