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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...
Computer simulations of two-phase gas-liquid pipe flow cases have been performed with the commercial code STAR-CD using the VOF method and the results are illustrated in this paper. Computed pressure losses for stratified flow and stratified-wavy flow and time-averaged liquid levels are compared against measured data, showing good agreement with the experimental data. To achieve these results, turbulence in the region close to the interface required the introduction of a law-of-the-wall based correction term in the turbulent energy dissipation equation. Two approaches for the turbulence...
A numerical study of a racecar front wing is presented. The focus of the study is to investigate the aerodynamics characteristics of a wing operating in a small ground clearance. A finite-span wing with a symmetric airfoil section is used. It was found that as the wing gets closer to the ground it generates more downforce and more drag. As the wing gets very close to the ground, the downforce reaches a maximum value and after that the wing generated less downforce as it gets closer to the ground. The drag force follows a similar trend of dependency on the ground clearance. The lower surface...
Abnormalities of the aortic arch , as the most proximal site of the cardiaovascular system , are of the great interest due to its major role in blood distribution to all downstream members. Wall dissection is one of the disorders that an aorta mau suffer due to hypertension or degaration of aortic wall properties. A geometrical change of the aortic ach caused by the dissected wal, and consequently the blood flow path ,makes the time varying flow curves to be different in comparison to the healthly aortic arch. This phenomenon modifies wall shear stres( WSS) history during the cardiac cycle...

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