Microscopic potential turbulence in tokamak plasmas are investigated by a multi-samplevolume heavy ion beam probe. The wavenumber/frequency spectra S(k,ω) of the plasmas potential fluctuation as well as density fluctuation are obtained for the first time. The instantaneous turbulence-driven particle flux, calculated from potential and density turbulence has oscillations of which amplitude is ab...

A natural laminar flow (NLF) airfoil is designed to reduce drag by expanding areas. In-depth knowledge of transition performance essential for its aerodynamic design. The k-ω-γ-Reθ framework, which consists the SST k-ω turbulence model and γ-Reθ model, employed simulate transitional flows around an NLF wing RAE5243 airfoil. performances under various values turbulent intensity, temperature, ang...

In shallow turbulent flows such as floods and tsunami vertical mixing tends to smooth out the flow characteristics in cross-sectional direction. The evolution of the average cross-flow characteristics presents considerable interest. We model such flows using the k-ω model of turbulence in the framework of the centre manifold theory. We tested the approach on an artificial diffusion problem for ...

Abstract Numerical modeling of the outflow an air jet into water with a guillotine rupture pipeline by VOF method using k-ε and k-ω SST turbulence models was carried out. The calculations were out in axisymmetric approximation. following phases process calculated: formation large gas bubble at place rupture, its growth, separation from behind bubble. It is shown that rate detachment model highe...

A novel model (D-model) of wave turbulence is presented which allows to reproduce in a single frame various nonlinear wave phenomena such as intermittency, formation and direction of energy cascades, possible growth of nonlinearity due to direct energy cascades, etc. depending on the initial state. No statistical assumptions are used, all effects are due to the behavior of distinct modes. Class...

A parallel adaptive mesh refinement (AMR) algorithm is described for predicting turbulent non-premixed gaseous combusting flows in three space dimensions. The Favreaveraged Navier-Stokes equations governing a reactive mixture of thermally perfect gases, the two transport equations of the k-ω turbulence model, and the time-averaged species transport equations, are all solved using a fully couple...

hisol isolator height [m] k turbulence kinetic energy [m2/s2] M Mach number p pressure [Pa] T temperature [°K] x axial (streamwise) coordinate [m] y vertical coordinate [m] yi mass-fraction of specie i y+ dimensionless vertical turbulence coordinate z lateral coordinate [m] φ equivalence ratio μ viscosity [N s/m2] ηc combustion efficiency ηm mixing efficiency ρ mass density [kg/m3] ω specific d...

A jet of fluid discharging into a cross stream, also known as Jet In Crossflow (JICF), has received many experimental and numerical investigations. In addition to the fundamental understanding of threedimensional mixing and shear flow characteristics, the fluid dynamics research community often regarded it as a benchmark test case for validating turbulence models. Although many authors consider...

In this paper, a numerical assessment of the effect shallow water on total resistance solar catamaran SolarCat is carried out using computational fluid dynamics within software package STAR–CCM+. The unsteady viscous flow was modelled based Reynolds-averaged Navier–Stokes (RANS) equations with application k−ω SST (k−ω Shear Stress Transport) turbulence model. RANS were discretized by finite vol...