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CFDRC to Develop Urban Dispersion Tool
Posted Tue October 16, 2001 @10:20AM
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ESI Group At a time when it is unfortunately very topical, CFDRC has been awarded a contract to develop simulation tools to model the dispersal of nuclear, chemical, biological, and radiological (NCBR) substances in urban areas.

The tool, dubbed the Urban Dispersion Simulator (UDS), must overcome such modeling obstacles as geometry acquisition, meshing, and attaining a solution on building to city blocks scale. Additionally, prevailing wind and turbulence fields, buoyancy, solar radiation, tree-induced flow losses, HVAC effects, and the dispersal of gas-phase agents as well as solid and liquid dispersants must be considered.

To facilitate rapid modeling of such large-scale structures, CFDRC has hit upon an image based approach to model generation. By analyzing an image representing a height map of the area of interest, a voxel-based solid model is created. The solid model is then used to create a CFD mesh using a 2N tree-based mesh generator.

The UDS development is being funded under a Small Business Innovation Research contract through the Defense Threat Reduction Agency.

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COSMOS/Flow to be Embedded in SolidWorks
Posted Mon October 15, 2001 @05:34PM
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News Structural Research and analysis Corp and Blue Ridge Numerics have announced that the upcoming release of COSMOS/Flow will be integrated inside SolidWorks.
This new level of integration will allow Fluid-Structure interaction between COSMOS/Works and COSMOS/Flow. Fluid-Structure interaction allows transfer of wall forces, computed during CFD analysis, to a structural analysis study. No other analysis software allows this type of coupled analysis for SolidWorks users.
Integration of CFD into solid modeling packages seems to be a trend.

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Bubble Interaction - Simulating Multiphase Flows
Posted Fri October 12, 2001 @11:03AM
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Application There is some interesting research being done at Worcester Polytechnic Institute on how bubbles interact in a rising column. By using DNS on the complex motions of a large number of bubbles, the researchers have shown that rising bubbles do follow some fundamental structure -- for spherical bubbles at least.

Spherical bubbles tend to rise in pairs, if one bubble is behind, following in the wake of another, it gets speeded up in the upward-moving wake, catches up, hits the top bubble, they tumble, and then both travel in horizontal alignment.

However, the shape of the bubble is dependent on the surface tension of the fluid.

"But as the surface tension drops and the bubbles flatten, this forces the flow to go around in a different way. The ellipsoidal bubbles become little winglets, and that changes the direction of the lift, completely reversing it so that it draws them into the faster moving fluid found in the wakes of passing bubbles. As a result, unlike spherical bubbles, flattened bubbles will sometimes stream together, following each other up in narrow columns,"
To do this, the researchers have developed a method for tracking the deforming bubble surface as a triangulated 2-D grid as it progresses across a fixed grid. This allows for the accurate simulation of 3D systems with a large number of bubbles over a long period of time.

In the future, the researchers hope to extend the model to include phase change and mass transfer as well as modeling fundamentally different bubble behavior, for example large single bubbles which can wobble and follow a spiraling pattern as they ascend.

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TrueGrid V2.1 Released
Posted Fri October 12, 2001 @10:42AM
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Grid Generation XYZ Scientific Applications, Inc. has released a new version of their CFD grid generation software. TrueGrid Version 2.1 contains powerful new features to quickly generate accurate simulations and shorten the design cycle.

A few of the enhancements in the new version include:

  • Interactive Command History Window
  • Diagnostic Tools
  • Double Precision
  • New Elliptic Smoothing Techniques
  • Interactive Spotwelds
  • More Support for CAD

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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.

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

www.airflow.ethz.ch
www.afc.ch
www.cfx-germany.com"

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