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...

Anomalous transport caused by plasma turbulence has long been a central subject in research on the magnetic confinement fusion. Ion temperature gradient (ITG) driven turbulence is considered to be responsible for the anomalous ion heat transport in a core of magnetically confined plasmas. Kinetic and fluid simulation studies on the ITG turbulence transport have been actively done in the last de...

We present the first evidence of the direct influence of gas turbulence on the shear instability of a planar air-water mixing layer. We show with two different experiments that increasing the level of velocity fluctuations in the gas phase continuously increases the frequency of the instability, up to a doubling of frequency for the largest turbulence intensity investigated. A modified spatiote...

We give a nonstandard variant of Jordan’s proof of the Jordan curve theorem which is free of the defects his contemporaries criticized and avoids the epsilontic burden of the classical proof. The proof is selfcontained, except for the Jordan theorem for polygons taken for granted.

Numerical analysis is performed to investigate transport phenomena in channel flows under uniform heating from both side-walls. Emphasis is placed on an effect of heat flux ratio from both sides on the velocity and thermal fields. The twoequation heat-transfer model is employed to determine thermal eddy diffusivity. It is found that (i) under strong heating from both walls, laminarization, i.e....

in the present paper, a 3d numerical model has been applied to predict the flow hydrodynamics around power intakes within the dez dam reservoir. the dez dam is a 203 m high, double arch concrete dam which is constructed by italians in 1962. since then, sedimentation in reservoirhas continued and since the dam does not have bottom outlet, the reservoir bed level is raising by a rate of about 2.5...

The influence of streamline curvature on small-scale turbulence and vertical mixing in stratified fluids is the subject of this study. The roles of curvature and stratification in enhancing and suppressing turbulent mixing are explored using second-moment closure for turbulence. Governing equations for second moments are expressed in generalized orthogonal curvilinear coordinates, from which, t...

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...

The nonstandard picture of a turbulent field is presented in the article. By the concepts of nonstandard mathematics, the picture describes the hierarchical structure of turbulence and shows the mechanism of fluctuation appearing in a turbulence. The uncertainty of measurement is pointed out. And the fundamental equations of turbulence are given too. It is natural in this picture that the reaso...