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Is Your Solution Converged?
Posted Thu December 13, 2001 @08:10PM
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Solver In their latest newsletter, Fluent offers advice to engineers running CFD solutions on when to declare your solution converged.

The article covers the basics of solution convergence in a CFD simulation and discusses the level of convergence necessary for differing applications. For instance, a highly converged solution is required if you are examining minute details in the flow field as opposed to a case where you are simply looking for approximate flow features.

During the course of the iterative solution algorithm, the imbalance in each cell is a small, non-zero value that, under normal circumstances, decreases as the solution progresses. This imbalance is called the residual.
The article also describes some ways in which the solution convergence can be monitored. These include plots of the total residual, integrated quantities at surfaces (such as mass flow rate), and derived quantities, such as the drag coefficient.

In conclusion the article points out that solution convergence is only one part of overall simulation accuracy.

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CFD is Fundamental to Design
Posted Thu December 13, 2001 @03:58PM
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News Industry Week magazine recently interviewed Blue Ridge Numerics President Ed Williams on the role of CFD in product design. Williams stated that the company was founded to demonstrate that CFD should be used by product designers and that a primary goal of their CFdesign CFD package is ease of use, so that CFD can be incorporated into the design process.
Just hearing the words 'computational fluid dynamics' is usually enough to send shudders down the spines of most product-development engineers. The mention of CFD still tends to conjure up images of stern-looking men in white lab coats conducting experiments in NASA test cells.
The full text of the interview is available at the CFdesign web site.

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CFD Best Practice Guidelines
Posted Thu December 13, 2001 @03:22PM
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News The European Research Community On Flow, Turbulence And Combustion (ERCOFTAC) has commissioned a Best Practice Guidelines (BPG) document for computational fluid dynamics. The document is available through the ERCOFTAC web site and addresses mesh design, boundary conditions, sensitivity checks, and the limitations of turbulence models. Advice was sought from leading researchers and commercial code vendors.

The document has seven chapters which address sources of error and provides short simple bullet-point statements of advice following the discussion.

There are also eight example calculations, calculated by the commercial code vendors, which are explained in detail. These test cases range from natural convection in a cavity through to flow in a low speed centrifugal compressor and in an internal combustion engine valve.

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Gridgen/FIELDVIEW Joint UGM Scheduled
Posted Thu December 13, 2001 @12:22PM
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Announcements Pointwise and Intelligent Light will host the 5th Annual Joint Gridgen/FIELDVIEW User Group Meeting on January 15th during the AIAA's 40th Aerospace Sciences Meeting and Exhibit in Reno, Nevada.

The meeting will feature discussions on the future of CFD and the role Pointwise and Intelligent Light will play in helping you realize that future. Technical discussions will focus on new scripting capabilities in both codes. In-depth demonstrations of both codes will be available throughout the week in the exhibit hall (Booth 101).

For more information, visit

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The Best 3D Workstation
Posted Wed December 12, 2001 @04:48PM
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Hardware CAD Server has a feature article on the lastest PC workstations for 3D modeling. The article looks at the immense changes which have taken place in the PC 3D market in the last few years -- driven mostly by 3D games. In addition to looking at professional 3D graphics cards, the article examines the performance of some CAD workstations.

If you are in the market for a new workstation, or would like to know who's leading the field, give the article a read.

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Fluent to Offer General Fluid Mechanics and CFD Course
Posted Wed December 12, 2001 @01:37PM
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News Beginning in the second quarter of 2002, Fluent, Inc. will be offering a two-day course as an introduction to fluid mechanics, heat transfer and computational fluid dynamics at two of their US offices. The course is designed to provide a thorough understanding of the underlying physics and numerical techniques of CFD analysis. Attendees are assumed to have a technical background, but not necessarily an engineering degree. The topics are covered in a general fashion with no bias towards any CFD software package.

The first day is a review of fluid mechanics (governing equations, non-dimensionalization, boundary layer flow, internal/external flows, and heat transfer). The second day will focus on CFD techniques including descretization, boundary conditions, meshing considerations, solvers, and post-processing.

For more information, visit the course descriptions online.

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