... fluids Stability Transition 13 03 2018 17 07 2018 Copyright © 2018 by ASME 2018 0098-2202/2018/140(11)/114501/4/ $25.00 ...

... Transition The establishment of a solid scientific understanding of the fundamental processes of thermal engineering and heating, ventilation and air conditioning is essential to contributing to the academic strength of the field during its necessary evolution. Regarding the branch of fluid mechanics...

... atmospheric to that of 100 magnitudes, while the turbine generates extremely high power. The turbine should, thus, operate stably to ensure reliable turbopump operation. Aerodynamics Pumps Stability Turbomachines Transition 30 08 2017 17 05 2018 Contributed by the Fluids...

...İlyas Karasu; Mustafa Özden; Mustafa Serdar Genç The performance of the transition models on three-dimensional (3D) flow of wings with aspect ratios (AR) of 1 and 3 at low Reynolds number was assessed in this study. For experimental work; force measurements, surface oil and smoke-wire flow...

...Solkeun Jee; Jongwook Joo; Ray-Sing Lin An efficient large-eddy simulation (LES) approach is investigated for laminar-to-turbulent transition in boundary layers. This approach incorporates the boundary-layer stability theory. Primary instability and subharmonic perturbations determined...

...Pascal Bader; Manuel Pschernig; Wolfgang Sanz; Jakob Woisetschläger; Franz Heitmeir; Walter Meile; Günter Brenn Flow in turbomachines is generally highly turbulent. Nonetheless, boundary layers may exhibit laminar-to-turbulent transition, and relaminarization of the turbulent flow may also occur...

... in the laminar separation region of the shear layer, and the importance of nonlinear interactions with harmonics in the transition process. 1 Corresponding author. Information regarding the spatial growth of disturbances and transition can also be obtained by performing spectral analysis of the velocity...

... 15, 2017; published online November 3, 2017. Assoc. Editor: Olivier Coutier-Delgosha. 09 09 2016 15 05 2017 Cavitation Pumps Stability Turbomachines Transition Rocket engines should provide high power while being light weight; thus, the rotational speed of engine...

... Unsteady flows Turbomachines Transition World is faced with a complex and challenging restructuring of its energy system. Many countries have agreed to undertake major cuts in its greenhouse gas emissions and to increase power generation from renewable resources, experiencing an increased power...

... Unsteady flows Transition Reversible pump-turbines are widely used in pumped-storage power stations [ 1 ], which can be used for peak power regulation when the grid needs power, where the excess power is available. They are useful for improving grid safety and stability. The total installed...

... Turbulence Turbulence modeling Turbomachines Transition Early work on relaminarization (i.e., reversion of an initially turbulent or transitional boundary layer to a laminar-like state) was often done at relatively low Reynolds numbers, and shown to be amenable to a quasi-laminar theory [ 1...

... Pumps RANS simulations Rotating fluids Stability Vortices Turbomachines Transition Many scientific and industrial applications feature a flow in the annulus of two concentric rotating shafts. This study therefore stands to benefit the many applications and deliver a high research impact...

... characteristics to capture the effects of initial conditions (mean flow and turbulence) on the variation of the characteristic variable. The union of these two independent relationships is formed leveraging the concept of flow intermittency to yield a generic functional relationship that incorporates transitional...

... simulation Gas dynamics Newtonian flows Stability Transition Surface roughness appears in many engineering applications, such as boilers, turbine machines, heat exchangers, and so on. The topology of surface roughness has a significant effect on the momentum and heat exchange; thus, many...

.... Assoc. Editor: Kwang-Yong Kim. 15 08 2016 01 02 2017 Computational fluid dynamics Fluid instability Jets Stability Unsteady flows Transition A fluidic precessing jet (FPJ) nozzle was first proposed by Nathan as a means to produce the FPJ flow [ 1 ]. This nozzle has...

...Richard S. Skifton; Ralph S. Budwig; John C. Crepeau; Tao Xing The principal purpose of this study is to understand the entropy generation rate in bypass, transitional, boundary-layer flow better. The experimental work utilized particle image velocimetry (PIV) and particle tracking velocimetry (PTV...

...Maurin Lopez; D. Keith Walters A physics-based modification to the k T − k L − ω transition-sensitive eddy-viscosity model is presented. The modification corrects an anomaly related to the physical mechanism of production of laminar kinetic energy for regions far from the wall in fully turbulent...

... in pockets of disturbances, which then propagate downstream attributing to random fluctuations near the reattachment. The separation and reattachment locations including the onset and end of transition are identified for changing α . The reattachment point changes from 18.8% to 47.7% of chord with the onset...

.... Assoc. Editor: Bart van Esch. 02 10 2015 01 08 2016 Complex flows Computational fluid dynamics Fluid instability Fluid transients Hydrodynamics Pumps RANS simulations Stability Turbulence modeling Unsteady flows Vortices Turbomachines Transition Intermittency...

...] Paolucci , S. , and Chenoweth , D. R. , 1989 , “ Transition to Chaos in a Differentially Heated Vertical Cavity ,” J. Fluid Mech. , 201 , pp. 379 – 410 . 10.1017/S0022112089000984 [20] Li , F. , and Malik , M. R. , 1995 , “ Fundamental and Subharmonic Secondary Instabilities...