Results 81 to 90 of about 8,939,787 (291)
Potential Vorticity Formulation of Compressible Magnetohydrodynamics [PDF]
Physical Review Letters, 2013 Compressible ideal magnetohydrodynamics (MHD) is formulated in terms of the time evolution of potential vorticity and magnetic flux per unit mass using a compact Lie bracket notation. It is demonstrated that this simplifies analytic solution in at least one very important situation relevant to magnetic fusion experiments.
openaire +3 more sources
Review of CFD modelling techniques for single‐phase and multiphase flow in static mixers
The Canadian Journal of Chemical Engineering, EarlyView.This review synthesizes computational fluid dynamics (CFD) approaches for static mixers, linking hydrodynamics to pressure drop, particle/droplet distributions, mixing metrics, and heat‐transfer performance to guide modelling choices and design decisions. Abstract Static mixers enable compact and low‐energy intensification.
Jussan Jaeger +7 more
wiley +1 more source
‘Preferred Trajectories’ defined by mass and potential vorticity conservation
Geofísica Internacional, 2020 La mayoría de los métodos para estimar velocidades geostróficas "absolutas", en ausencia de mediciones directas de velocidad, utilizan restricciones que definen la dirección del flujo a diferentes niveles verticales.
José Ochoa +3 more
doaj +1 more source
A Geometric Characterization of Steady Laminar Flow
Communications on Pure and Applied Mathematics, EarlyView.ABSTRACT We study the steady states of the Euler equations on the periodic channel or annulus. We show that if these flows are laminar (layered by closed non‐contractible streamlines which foliate the domain), then they must be either parallel or circular flows.
Theodore D. Drivas, Marc Nualart
wiley +1 more source
Bounds for Euler from vorticity moments and line divergence [PDF]
, 2013 The inviscid growth of a range of vorticity moments is compared using Euler calculations of anti-parallel vortices with a new initial condition.
Kerr, Robert M. (Robert McDougall)
core +1 more source
Ertel's Potential Vorticity and Irreversible Processes
Zeitschrift für Naturforschung A, 1995 According to Ertel's potential vorticity the thermodynamical parameters in the equation of state define the forces which move the vortices and modify them in space and time.
H.-J. Treder, W. Schröder
openaire +1 more source
Towards a Mean‐Field Braginskii Model for Stellarators
Contributions to Plasma Physics, EarlyView.ABSTRACT Experiments in the stellarator Wendelstein 7‐X indicate that particle drifts have a significant impact on the plasma in the scrape‐off layer. However, drift effects have been absent in the mean‐field transport codes such as EMC3‐Eirene. For this reason, we present the first steps towards a mean‐field model that incorporates drifts. The code is
T. Tork +7 more
wiley +1 more source
A New Atmospheric Background State to Diagnose Local Waveguidability
Geophysical Research Letters, 2023 A new procedure to obtain a longitudinally varying and slowly evolving atmospheric background state for the analysis of Rossby waveguides is described and discussed. The procedure is a rolling zonalization scheme, redistributing Ertel potential vorticity
Christopher Polster, Volkmar Wirth
doaj +1 more source
On calculating the potential vorticity flux [PDF]
Physics of Plasmas, 2015 We discuss and compare different approaches to calculating the dynamics of anisotropic flow structure formation in quasi two-dimensional turbulence based on potential vorticity (PV) transport in real space. The general structure of the PV flux in the relaxation processes is deduced non-perturbatively.
Pei-Chun Hsu, P. H. Diamond
openaire +3 more sources
Energy Science &Engineering, EarlyView.Turbulence intensity from 1% to 25% was parametrically tested on a three‐bladed H‐type Darrieus rotor across five tip speed ratios (TSRs) using two‐dimensional URANS. The optimal TSR proved the most efficient and most robust operating point simultaneously, with Cp losses capped at 5.8% even at TI = 25%. ABSTRACT The effect of inlet turbulence intensity
Aydin Ulus
wiley +1 more source