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Application: CFD Reduces Design Time from 1 Year to 4 Weeks
Posted Fri January 11, 2002 @02:22PM
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Application By adding computational fluid dynamics (CFD) analysis to its product development process, Blender Products was able to design a new HVAC air mixer in four weeks, down from the one year required for its previous mixer. Designing that product had required many rounds of prototype testing, each taking several months, to determine how efficiently the device mixed two streams of air. For the new mixer, the company ran multiple CFD analyses to evaluate different design iterations in software. Each iteration took less than a week. The results guided designers as to what elements could be removed to reduce manufacturing costs while maintaining mixing efficiency. Nearly all prototype testing was eliminated, allowing Blender Products to quickly capitalize on a new market opportunity. The company also uses CFD analysis to evaluate how its mixers will work when added to existing installations. This formerly required testing of a scale model, a process that took two to three months. The company now accomplishes the evaluation without a scale model and is done in one week.

( Read Full Article | Application )

Application: CFD Fixes Faulty Mixer
Posted Fri January 11, 2002 @02:05PM
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Application Philadelphia Mixers used MixSim, a dedicated mixing analysis software package, to solve a problem with a pH adjustment system in a baffled mixing tank. The complete analysis, which required several simulations, took only one day, considerably less than the week or more that would have been required if general-purpose computational fluid dynamics (CFD) software and grid generation tools had been used. Most of this time would have been required to build the model because of the complex geometry of the system and the fact that it contained both stationary and moving parts. The mixing-specific software used set up the model automatically in response to parameters entered by the user. "After I entered a few specifications, the software created the geometry and the analysis mesh in less than 5 minutes," says Wojciech Wyczalkowski, director of technology at Philadelphia Mixers. After the first analysis showed the reason for the fluctuating pH, Wyczalkowski ran seven more analyses to improve the design. By the end of one day, he had an optimized solution that the customer has since implemented successfully.

( Read Full Article | Application )

Application: CFD Wins Races
Posted Wed December 12, 2001 @01:16PM
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Application CFD analysis has played an important role in the performance of winning motor racing teams this year. The dominant Ferrari Formula 1 Motor Racing Team claimed both the Drivers' and Constructors' World Championships. The Ferrari Technical Team utilized extensive CFD simulations with FLUENT to hone the aerodynamics package.

At the Indy 500 race last May, cars manufactured by Italy-based Dallara Engineering finished 1-2-3. Dallara recognized that CFD was essential to their aerodynamic design process and they chose FLUENT to be an integral part of it.

And in the competitive world of NASCAR racing, CFD has found a home in one of the best teams - Joe Gibbs Racing.

Team owner Joe Gibbs remarked, "To win at anything you have to surround yourself with the best. That is why we use FLUENT CFD software to visualize and analyze fluid flows such as air flowing over the vehicle or water flowing through the cylinder head. FLUENT is an integral part of keeping our race teams at their best."

( Post Comment | Application )

Application: CFD Used to Study Surface to Air Missles
Posted Mon December 10, 2001 @02:23PM
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Application Scientists at the NAS Division's Applications Branch have used NASA's Cart3D CFD software to analyze the unsteady flight of infrared-guided, man-portable surface-to-air missles (SAMs).

The Cart3D solver's capabilities were extended to simulate the unique flight characteristics of the SAMs which make them difficult to simulate computationally. Scientists used the NASA Advanced Supercomputing facility at Ames Research Center to conduct the steady and unsteady simulations on both a 1024-processor and 512-processor SGI Origin 3000 system. More than 720 simulations were completed on meshes totaling almost 2.4 billion cells.

"Results from preliminary NAS studies presented to the DIA have been met with enthusiastic support," said Mike Aftosmis. The steady and unsteady results have shed new light on the flight characteristics of these missiles.
The Cart3D package is an inviscid Cartesian grid flow solver which provides end-to-end simulation of three-dimensional flows around complex vehicles.

( Post Comment | Application )

Application: ESA's Use of CFD on the ISS
Posted Wed November 21, 2001 @11:47AM
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Application The European Space Agency (ESA) is using CFD in the design of enviromental control facilites in the Automated Transfer Vehicle (ATV) and to predict gas impingement forces in the sensitive Columbus laboratory on the International Space Station (ISS).

The ATV is used for delivering equipment and consumables to the ISS and for orbital re-boosting when the ISS has lost altitude due to atmospheric friction. The Integrated Cargo Carrier (ICC) module, located at the front of the ATV, carries dry cargo which is placed in up to 8 racks mounted in the cylindrical portion of the ICC.

The ICC does not have an advanced enviromental control system, but does have a cabin fan designed to guarantee good ventilation and to ensure an adequate air distribution for crew comfort. Another primary goal of the fan is to avoid any stagnant flow regions in which toxic gases could accumulate and pose a suffocation threat to the astronauts. In addition, the air speed should be always lower than 0.25 m/s in the crew cabin, whereas the air temperature should be less than 28C, but more than the minimum dew temperature of 16C. Also, the 'touch temperatures' of surfaces exposed to the crew should not exceed 45C.

Rather than build an expensive experimental apparatus to test the flow field in the ICC, ESA turned to CFDRC for CFD software which could be used to predict the flow field within the ICC.

( Read Full Article | Application )

Application: Designing the Optimum Swim Stroke
Posted Tue November 20, 2001 @09:39AM
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Application Researchers at USA Swimming have been using FLUENT to model the flow around the hand and forearm of a swimmer during the propulsive phases of the freestyle and butterfly strokes. The program aims to determine the optimum swim stroke to provide maximum propulsive performance for elite swimmers.

During the initial stage of the investigation, researchers sought to determine the steady-state lift and drag coefficients for the hand and arm. The model for these simulations used k-epsilon turbulence modeling with non-equilibrium wall functions. Adaptive meshing was utilized to increase solution accuracy.

( Read Full Article | Application )

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