This paper proposes visualization based on augmented reality (AR) for aerodynamics simulation in a sustainable cloud computing environment that allows the Son of Grid Engine different types of computers to perform concurrent job requests. A simulation of an indoor air-purification system is performed using OpenFOAM computational fluid dynamics solver in the cloud computing environment. Post-processing converts the results to a form that is suitable for AR visualization. Simulation results can be displayed on devices, such as smart phones, tablets, and Microsoft HoloLens. This AR visualization allows for users to monitor purification of indoor air in real time.
This study presents a result on aero-acoustic characteristics of pantograph panheads. To analyze the fluid flow around the panhead and resulting sound radiation, simple models of panhead were used in the numerical simulations called Lattice-Boltzmann method. The simulation results were verified using the wind tunnel test. The main aerodynamic noise was generated from the vortex shedding which is characterized by the Strouhal number, flow speed and geometry. The reduction in the radiated noise with simultaneously achieving increased lifting force was implemented for the simple rectangular geometry used in this study. Also, it was shown that the radiated sound power was significantly reduced by minimizing vortex shedding using through-holes or streamline shapes.
Based on the Lattice Boltzmann method, aerodynamic noise from the pantograph of high-speed trains was investigated. The mechanism of the noise generation was analyzed using a simple panhead model, and the numerical procedures were extended to analyze sound radiation from the whole pantograph system. The square and circular cross-sectional cylinders were used to simulate the panheads. The primary noise was generated by flow separation accompanied by vortex shedding. Since the pantograph were consisted of a series of the rods, the primary noise generation characteristics were similar to the simple panhead. From the numerical model, the design of the pantograph for reduced aerodynamic noise generation is proposed and validated.
In this study, to analyze aerodynamic noise from the pantograph on high-speed train, numerical model was established. We study the mechanism of the noise generation by setting up the simple model and finally analyze entire pantograph model. Based on the Lattice Boltzmann Method, computational fluid analysis was carried out. Through noise analysis for near field, sound radiation for far field was estimated using Ffowcs Williams and Hawkings Equation. Simple model is the square and circular cross-sectional cylinder. This model makes noise by flow separation accompanied by vortex shedding. Considering pantograph have a series of the rods, we made a complex structure which have square and circular cross-sectional cylinder. By analyzing entire pantograph model we suggest the model for predicting the noise generation and radiation.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.