نتایج جستجو برای: cascade flow

تعداد نتایج: 523988  

2014
WILLIAM LAYTON

The 1877 assumption/conjecture of Boussinesq is that turbulent fluctuations have a dissipative effect on the mean flow. The eddy viscosity hypothesis is that this dissipative effect can be modelled by a turbulent viscosity term. Many computational and experimental data sets have shown that the eddy viscosity hypothesis is not generally correct. The inverse cascade of energy to larger scales in ...

Farhad Ghadak Hamid Javaniyan Jouybari Majid Reza Shahhoseini Manuchehr Rad Mohammad Eftari

Design models of multi- stage, axial flow compressor are developed for gas turbine engines. Axial flow compressor is one of the most important parts of gas turbine units. Therefore, its design and performance prediction are very important. One-dimensional modeling is a simple, fast and accurate method for performance prediction of any type of compressors with different geometries. In this appro...

2010
Frédéric Moulin Jan-Bert Flór

In large-scale geophysical flows, the dominant presence of background rotation and stratification not only prompt the inverse energy-cascade towards large scales, but also support waves e.g. generated during geostrophic adjustment. Here we consider interactions of inertia-gravity waves with a baroclinic vortex in a rotating linearly-stratified fluid, using WKB approach and experimental results....

Journal: :JSME international journal. Ser. 2, Fluids engineering, heat transfer, power, combustion, thermophysical properties 1991

Journal: :Acta Polytechnica 2021

This paper deals with the numerical simulation of 2D transonic flow through SE1050 turbine blade cascade at various conditions. The first one concerns design operation a zero incidence angle involved in ERCOFTAC Database CFD-QNET and second +20° corresponding to an off-design operation. Advanced mathematical models two different bypass transition turbulence were applied for regimes flows as wel...

Journal: :Symmetry 2022

Sediment abrasion may cause the removal of material and efficiency loss to hydraulic machinery (hydro-turbine, pump, etc.), which worsen internal flow endanger safe operation machines. As is caused by impact sediment on solid surface, movement particles determines wear intensity. To understand mechanism machinery, motion characteristics asymmetric solid–liquid two-phase in a sediment-laden arou...

2008
H. Susannah Moat Martin Corley Robert J. Hartsuiker

Current psychological models of word production (e.g. Dell, 1986; Levelt, Roelofs, & Meyer, 1999) only detail how we plan the phonological content of words, and not how we articulate them. To understand how these models may be extended, we must determine how information flows from phonological encoding to articulation. For example, does activation cascade from unselected phonological representa...

2003
MINA OSSIANDER EDWARD C. WAYMIRE

The notion of multiplicative cascade was introduced into the statistical theory of turbulence by A.N. Kolmogorov as a phenomenological framework intended to accommodate the intermittency and large fluctuations observed in turbulent fluid flows. The basic idea is that energy is redistributed from larger to smaller scales via a splitting mechanism involving random multiplicative factors known as ...

2014
A. J. ACOSTA

P RESENT day interest in the high-speed performance of hydrofoil boats, ship propellers, pumps, and turbines has resulted in an intensive study of cavitation in liquid flows. During this process the flow field changes significantly from that of a homogenous single-phase flow. Forces, pressure distributions, and other performance characteristics are then correspondingly altered and these changes...

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