Results 41 to 50 of about 6,551 (166)

Augmenting the Structures in a Swirling Flame via Diffusive Injection

open access: yesJournal of Combustion, 2014
Small scale experimentation using particle image velocimetry investigated the effect of the diffusive injection of methane, air, and carbon dioxide on the coherent structures in a swirling flame.
Jonathan Lewis   +3 more
doaj   +1 more source

Unsteadiness of Tip Leakage Flow in the Detached-Eddy Simulation on a Transonic Rotor with Vortex Breakdown Phenomenon

open access: yesEnergies, 2019
Tip leakage vortex (TLV) in a transonic compressor rotor was investigated numerically using detached-eddy simulation (DES) method at different working conditions.
Xiangyu Su   +3 more
doaj   +1 more source

Suppression of the superfluid Kelvin-Helmholtz instability due to massive vortex cores, friction and confinement

open access: yesSciPost Physics
We characterize the dynamical instability responsible for the breakdown of regular rows and necklaces of quantized vortices that appear at the interface between two superfluids in relative motion.
Matteo Caldara, Andrea Richaud, Massimo Capone, Pietro Massignan
doaj   +1 more source

Numerical Investigations into the Origin of Tip Unsteadiness in a Transonic Compressor

open access: yesJournal of Applied Fluid Mechanics, 2018
Three-dimensional numerical simulations are conducted to investigate the origin of flow unsteadiness and its associated unsteady flow phenomena in a transonic compressor rotor. The predicted results are compared with the available experimental data and a
G. An, Y. Wu, J. Lang, Z. Chen, B. Wang
doaj  

Quantifying Swirl Number Effects on Recirculation Zones and Vortex Dynamics in a Dual-Swirl Combustor

open access: yesEnergies
Swirl-stabilized combustors are central to gas turbine technology, where the swirl number critically determines flow structure and combustion stability. This work systematically investigates the isothermal flow in a dual-swirl combustor, focusing on two ...
Hafiz Ali Haider Sehole   +5 more
doaj   +1 more source

Polar Vortex Disruptions by High Latitude Ocean Warming

open access: yesGeophysical Research Letters
Mid‐latitude extreme cold outbreaks are associated with disruptions of the polar vortex, which often happen abruptly in connection to a sudden stratospheric warming.
Mostafa E. Hamouda   +2 more
doaj   +1 more source

The Generation and Maintenance of Hollow PV Towers in a Forced Primitive Equation Model

open access: yesProceedings, 2017
Diabatic heating from deep moist convection in the hurricane eyewall produces a towering annular structure of elevated potential vorticity (PV), known as a hollow PV tower. For sufficiently thin annular structures, eddies can extract energy from the mean
Gabriel J. Williams Jr.
doaj   +1 more source

Numerical Simulation of Self-Sustained Roll Oscillations of an 80-Degree Delta Wing Caused by Leading-Edge Vortices

open access: yesAerospace
Numerical simulations of an 80-degree delta wing in free-to-roll motion are performed by applying the dynamic fluid–body interaction (DFBI) model and the overlap/chimera method using the URANS equations.
Mohamed Sereez   +3 more
doaj   +1 more source

A Resolution Independent Solution for Confined Axisymmetric Vortex Breakdown Flow

open access: yesJournal of Fluid Science and Technology, 2007
Numerical simulation is performed for the vortex breakdown flows induced in a cylindrical container with rotating top disk. Solutions are obtained for the parameter ranges where steady axisymmetric flows are stable with respect to asymmetric disturbances.
Reima IWATSU, Hide S. KOYAMA
doaj   +1 more source

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