Αποτελέσματα 1-16 από 16
-
Cascaded Composite Turbulence and Misalignment: Statistical Characterization and Applications to Reconfigurable Intelligent Surface-Empowered Wireless Systems
(2022)Reconfigurable intelligent surfaces (RISs) empowered high-frequency wireless systems are expected to become the supporting pillar for several reliability and data rate hungry applications. Such systems are, however, sensitive ... -
A comparative study of numerical schemes and turbulence models for wind turbine aerodynamics modelling
(2004)This paper is a comparative study of combining turbulence models and interpolation schemes to calculate turbulent flow around a NACA0012 airfoil before and after separation. The calculations were carried out using the code ... -
Detection of jet axis in a horizontal turbulent jet via nonlinear analysis of minimum/maximum temperature time series
(2019)We have analyzed experimental temperature time series from a horizontal turbulent heated jet, in order to identify the jet axis location using non linear measures. The analysis was applied on both, the original time series ... -
Direct numerical simulation of particle-laden turbulent channel flows with two- and four-way coupling effects: Budgets of Reynolds stress and streamwise enstrophy
(2016)The budgets of the Reynolds stress and streamwise enstrophy are evaluated through direct numerical simulations for the turbulent particle-laden flow in a vertical channel with momentum exchange between the two phases. The ... -
Horizontal round heated jets into calm uniform ambient
(2009)In this article, we investigate horizontal, round, turbulent buoyant jets that discharge in a homogeneous calm ambient fluid. In a series of experiments performed, the initial jet Richardson numbers ranged from very small ... -
Investigation of various nozzles configurations with respect to IFMIF and liquid walls concepts
(2015)The study of liquid-metal free surface flows is of great interest in the fusion research, for example in the IFMIF and liquid walls concepts. In the IFMIF project, the main goal is to test candidate metallic materials in ... -
Microrotation viscosity effect on turbulent micropolar fluid channel flow
(2021)Fluids with an internal rigid microstructure, the so-called micropolar fluids, gain significant attention in many industrial, natural, and biological systems. Here, we study in detail the microrotation viscosity effect on ... -
New results on turbulence modeling for free-space optical systems
(2010)In this paper, we propose a statistical channel model, named as Double-Weibull, to describe the irradiance fluctuations in moderate and strong turbulence for free-space optical (FSO) systems. The proposed stochastic model ... -
Numerical simulations of the IPPE target geometry flows
(2013)A high speed water and liquid lithium (Li) flow is computed over the IPPE geometry to evaluate the performance of different turbulence models in 2D and 3D simulations. Results reported are the thickness of the liquid jet, ... -
Outage Probability of a Multisensor Mixed UOWC-FSO Setup
(2019)The performance of a network consisting of several underwater sensors communicating with a terrestrial destination is studied for the first time in terms of the outage probability. In the scenario under consideration, K ... -
Performance Analysis of Multi-Reconfigurable Intelligent Surface-Empowered THz Wireless Systems
(2022)In this paper, we introduce a theoretical framework for analyzing the performance of multi-reconfigurable intelligence surface (RIS) empowered terahertz (THz) wireless systems subject to turbulence and stochastic beam ... -
Performance of free-space optical communications over a mixture composite irradiance channel
(2017)The performance of a typical free-space optical link using a recently proposed composite model for turbulence and pointing error effects is studied. This model offers analytical tractability in the statistical description ... -
Reynolds number effect of the turbulent micropolar channel flow
(2022)The turbulent regime of non-Newtonian flows presents a particular interest as flow behavior is directly affected by the internal microstructure type of the fluid. Differences in the dispersed phase of a particle laden flow ... -
A simple statistical model for turbulence-induced fading in free-space optical systems
(2010)In this paper, we propose the Inverse Gaussian (IG) distribution, as a less complex alternative to Log-normal (LN), to describe turbulence-induced fading in free-space optical (FSO) systems operating in weak turbulence ... -
A Tractable Model for Turbulence- and Misalignment-Induced Fading in Optical Wireless Systems
(2016)Composite models for the combined effect of both scintillation- and misalignment-induced fading in terrestrial optical wireless systems are often expressed in terms of higher order special functions, making, thus, the ... -
Wavelet analysis of high-speed transition and turbulence over a flat surface
(2022)This paper presents a study of high speed boundary layers using the wavelet method. We analyze direct numerical simulation data for high-speed, compressible transitional, and turbulent boundary layer flows using orthogonal ...