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Application: Modeling Biological Systems
Posted Wed October 10, 2001 @10:16AM
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Application The study of living systems interacting with fluids is a difficult one characterized by the interaction of flexible elastic tissue with viscous incompressible fluid. The Immersive Boundary Method has been developed to simulate such systems.

The Immersive Boundary (IB) Method attempts to model the elastic material as a part of the fluid with additional forces due to elastic stress. The fluid equations are solved in a Lagrangian fashion on a fixed regular lattice mesh. The elastic material is tracked by following a collection of representative points as they move across the mesh. The spacial configuration of these points is used to compute elastic forces which are applied to nearby fluid points in the lattice. In general, the method is applicable to any problem in which a fluid interacts with a flexible material.

The IB method has been applied to a wide variety of problems including a beating three-dimensional heart, valve-less pumping, blood clotting, the swimming motion of fish and eels, and the inner ear.

In such problems, the immersed boundary method opens up the prospect of raw simulation, almost akin to experiment, in which something approaching the full complexity of the system is allowed to operate in the model. -- Charles S. Peskin and David M. McQueen

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cfd seminar at eth zurich with partners
Posted Tue October 09, 2001 @09:37AM
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Announcements daniel gubler writes "Seminar CFD für Strömungsanalysen in der Praxis

Das Seminar vermittelt Wissen zum Einsatz numerischer Methoden (Computational Fluid Dynamics - CFD) bei strömungstechnischen Fragestellungen. Die Teilnehmer sollen einen Überblick über die Leistungsfähigkeit moderner CFD-Software erhalten. Es werden wertvolle Informationen über die Anwendbarkeit von CFD auf die Aufgaben in der täglichen Praxis gegeben. Folgende Anwendungsgebiete werden angesprochen:

Gebäudetechnik, Rauchausbreitung und Brandschutz,Industrielüftung, rotierende Strömungsmaschinen (z.B Lüfter,Pumpen, Turbomaschinen)Engineering, Sicherheit und Umwelt, Anlagenbau und Verfahrenstechnik.

Vorträge über das immer wichtiger werdende interdisziplinäre Feld der Fluid-Struktur-Kopplung sowie über Echtzeit-Strömungssichtbarmachung im Windkanal runden das Programm ab. Die Referenten sind langjährige, erfahrene CFDAnwender, die Sie gerne bei Ihren konkreten Anwendungsfragen beraten und Ihnen Hilfestellung beim Herangehen an die Strömungsberechnung geben. Je nach Komplexität der zu berechnenden Probleme bieten sich dabei zwei Vorgehensweisen an: selber machen oder einen externen Dienstleister heranzuziehen. Hier erhalten Sie Tips, welcher Weg für Sie der richtige ist und was Sie beachten sollten.

ETH Zürich, Auditorium Maximum
HG F 30, Rämistr. 101
CH - 8006 Zürich"

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CFD optimization of an advanced local ventilation
Posted Tue October 09, 2001 @09:20AM
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Application Daniel Gubler writes "Optimal local ventilation systems by Daniel Gubler, ETH Zurich The "Air&Climate" group of the Institute of Building Technology at the Swiss Federal Institute of Technology in Zurich has been working with CFX-5 for two years now. The group is using CFD for building technology-related research, in areas including airflow in office buildings, spread of smoke during fires and particulates transport.

The latest project deals with new systems for local ventilation, which are frequently used in industry in environments such as welding workplaces. Within a European COST project, CFX has been chosen to optimize a new system, the REEXS (REinforced EXhaust System). This system provides local ventilation with an extended suction range by blowing several fine clean-air jets normal to the exhaust, these jets serving to closely channel the contaminant to the exhaust hood.

CFX-5 was used to optimize the design of both the exhaust hood and the air-jet nozzles as well as to find the right operating parameters for specific hood designs. With CFX-5’s unstructured mesher, systematic analyses of design variations, such as nozzle details or jet exit angles, could all be carried out with less effort than with conventional meshing methods.

After initial simulations showed very close agreement with experimental data, CFX was used to evaluate the performance of the design under realistic operating conditions. The simulations considered the removal of welding fumes (accounting for the buoyant flow and heat source) in specific environments such as a draughty workplace. The capture efficiency was calculated automatically from the mass balance provided in the output files of the simulations.

These calculations have allowed the capture efficiency of the local exhaust system to be estimated within the real working environment. Based on these results a prototype has been built and is now undergoing final testing in the wind tunnel. CFX-5 has proved to be a useful tool with which to optimise the REEXS design and will be used in further research for dimensioning of specific REEXS systems."

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EnSight Used for RAVE Visualization Lab
Posted Mon October 08, 2001 @11:08AM
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Post Processing NASA Glenn Research Center has installed EnSight Gold high-end visualization software, from CEI, on Fakespace's RAVE VR system. The system will be used to study the results from turbomachinery analyses including combustion and turbine blade failure.

The RAVE (Reconfigurable Advanced Visualization Environment) consists of 3 8 foot by 8 foot rear-projection screens which can be configured as an 8x24 wall, or as a three-wall immersive environment.

"With EnSight Gold on the RAVE, a detailed model of an intricate structure with many components, such as a jet engine, can be viewed from all angles and diverse vantage points," says Jay Horowitz, visualization manager at NASA Glenn. "We can now bring our data visualizations more 'out of the screen' than before. It is surprising how much better you can understand complex phenomena when you have more control over how you view it."

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Why Turbulence Modeling is so Important
Posted Mon October 08, 2001 @10:42AM
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Help Desk An article in Scientific American magazine provides an introduction to the simulation of turbulent flows and why the work is essential.

The article starts with a brief introduction to CFD and then progresses to the need for, and difficulty of, simulating turbulent flow. While the article does not go into turbulence modeling in-depth, it does provide readers with a basic understanding of the problems involved and the solutions which have been developed.

The growing popularity of computational fluid dynamics to study turbulence reflects both its promise, which is at last starting to be realized, and the continued rapid increase in computational power. As supercomputer processing rates approach and surpass a trillion floating-point operations per second over the next few years, fluid dynamicists will begin taking on more complex turbulent flows, of higher Reynolds numbers.

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CFX North American User Conference
Posted Thu October 04, 2001 @09:16AM
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CFX is pleased to invite you to our North American Users Conference illustrating the latest developments in our software and industrial applications. This four-day event includes paper presentation, product demonstration, software training courses, and one-on-one support clinics. CFX software users in North America will present the results of their work and share their experiences with others from around the continent.


We invite you to represent your company and speak at the conference. The conference will provide everyone with the opportunity to present the results of their work, as well as meet, discuss, and share experiences with like-minded users from around North America.

November 14, 2001 - Titles must be received.
January 31, 2002 - Abstracts must be received by CFX in order to be included in the delegate packs for the conference.
Please indicate your interest in presenting by contacting:

Email: "

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