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The intensity of the secondary flow induced, especially, by streamwise vorticity, which are generated in their turn by vortex generators or in flows with curved streamlines [Ajakh et al,] has a direct impact on the heat transfer process. Thus the understanding and quantification of the physical mechanisms underlying the heat transfer by streamwise vorticity are fundamental for practical applications...
A method was developed to estimate the frequency of vortex shedding in turbulent flow. In this method, a bivariate correlation was improved and introduced to the continuous temporal flow structures to estimate the correlation of each pair of the vortex structures. The Fast Fourier Transform (FFT) was employed to perform a power spectra analysis of these correlation coefficients to obtain the frequency...
The aerodynamic characteristics directly affect driving characteristics, stability, operation, oil consumption, and safety of automobiles. The virtual wind tunnel experiment simulation based on finite element method has provided useful theoretical reference to automobile bodywork design. In this study, the air flow and distribution information around the automobiles was obtained using aerodynamic...
This paper presents a new fluid vortex energy capturing system from fluid water as an energy source. The proposed system is characterized for feasibility study on the possibility of the use of a renewal energy system. The system consists of a mechanical impeller, basin, induction pine, and power capturing devices. All components are designed by using computational fluid dynamics under fluid simulation...
The paper introduces a kind of special emulsification device to apply in the coal mine. This special emulsifying device uses damping board to make water and emulsible oil turbulence increasing and vortex of different size when they flow through this device. With strong pulsation of the vortex, emulsible oil and water are diffused, mixed and transfered to all directions thus they are mixed adequately...
We present a novel method using particle importance to accelerate the traditional smoothed particle hydrodynamics based fluid simulation. Reynolds number and vorticity are exploited as the new criteria to evaluate the importance for each particle. If a particle is unimportant, its current acceleration and velocity are used to update values in the next time step with the complex state updating step...
Using in-vivo anatomical MRI scan, a scaled-up silicone model of the human ventricular system was built. A pulsatile pressure difference was applied across the aqueduct of Sylvius, and particle tracking velocimetry was used to measure the resulting three-dimensional fluid velocity distribution within the third ventricle. The obtained results were compared to velocimetric MRI scans of the same model;...
Numerical simulation of two-dimensional stagnation-point flow is investigated with the computational fluid dynamics (CFD) software of STAR-CD and results are compared with those obtained from the similarity solution. Study shows that velocity profiles are in good agreement between numerical simulation and similarity solution for high aspect ratio in the stagnation-point region. Numerical simulation...
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