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Aerodynamic performance of racing bicycles and practical considerations for CFD workflows
As CFD is being embraced by the frame, wheel and component manufacturers in the cycling industry, some practical challenges are quickly emerging. Discussions and concerns regarding the scope and resources required to conduct CFD studies, as well as their relevance, are quickly evolving - a phenomenon which is not unique to the cycling community. In this presentation we will outline a process, that can effectively help to manage CFD in the overall design process by directly addressing data management and workflow issues. Particularly we see a tremendous opportunity for cycling manufacturers,...
The present work describes the numerical simulation of a sonic nozzle performed by a commercial numerical code. The main objective of the work was to assess the reliability of such codes as tools for metrological work. The paper briefly describes the background of numerical simulation of fluid flows, and recalls the main formulations of common use in sonic nozzle analysis. The results show that, for a test case with a well-defined geometry and relatively simple boundary conditions, commercial CFD codes can be a useful support tool for metrological analysis.
Daimler and CD-adapco are 80%-85% complete in the full integration of a simulation management system into a PLM environment that eases the challenge for a non-CAE expert to run simulations. This paper highlights the body-in-white analysis and how conduction and the CFD link together seamlessly. PLM/XML provides the foundation to drive the data across the whole process. STAR-CCM+ performs the analysis on both the CFD side and the solid conduction side. This report is based on a presentation given by Thomas Walker at PLM Road Map™ 2011, with added participation by Walter Bauer, and was prepared...
Aerodynamic development of a time-trial bicycle helmet: From CFD to le the eulerian multiphase flow modelthe eulerian multiphase flow modelTour de France
CFD analysis is becoming a tool of choice in the competitive cycling industry. Cycling product development has taken advantage of integrating CFD in its development process. Significant improvements were made, mainly for drag reduction. CFD also serves the marketing department: multicolored CFD pictures and other engineering data is now the standard for cycling products promotion. Following this trend and with the help of Lx R&D, Louis Garneau Sport introduced CFD in the development of what was going to be the Vorticce, their best time-trial helmet to this date. The main benefits they...
Fluid flow, conjugate heat transfer and different operating parameters for a blister copper flash furnace tap hole assembly were evaluated using the multi-physics capability of STAR-CCM+ Version 5.02.009 as part of Bateman Engineering Projects ongoing development program to design and manufacture robust pyrometallurgical process furnace containment equipment capable of increasing campaign lives between partial and complete rebuilds. Furnace containment equipment is frequently used in conjunction with DC open arc, open bath smelting and lower side wall refractory cooling systems applications...
The asymmetric, elliptical shape of a transcatheter aortic valve (TAV), after implantation into a calcified aortic root, has been clinically observed. However, the impact of elliptical TAV configuration on TAV leaflet stress and strain distribution and valve regurgitation is largely unknown. In this study, we developed computational models of elliptical TAVs based on a thin pericardial bioprosthetic valve model recently developed. Finite element and computational fluid dynamics simulations were performed to investigate TAV leaflet structural deformation and central backflow leakage, and...
The mass transfer between a single droplet and a surrounding fluid can be described mathematically solving the momentum and mass balances in both phases (conjugate problem). This study of dimensionless parameters shows how the process is influenced by changes in material properties and operating conditions. The influence of the Reynolds number Re on the mass transfer is found to be small and to vanish for creeping flows. A sensitivity to the viscosity ratio μ * exists only in a limited range. The influence of the Peclet number Pe can be approximated for small Pe by considering only the...
It has recently been reported that noise generated in screw compressors can by reduced by modifying the shape of the high pressure port to minimize gas pulsations in the discharge chamber. This paper describes a simulation mode developed to predict the optimum form of this. The procedure used was to simulate the flow in three dimensions within the discharge chamber, using CFD, and to couple this with flow simulations in the working chamber and outlet reservoir, based on one dimensional models. The model takes into account the real shape of the discharge port. By its use it is possible to...

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