Results 231 to 240 of about 376,528 (290)
Some of the next articles are maybe not open access.
Progress in Energy and Combustion Science, 2001
Abstract This paper reviews the studies undertaken on vortex breakdown over the past 45 years. The paper is structured such that the area is considered in three sections — experimental, numerical and finally theoretical, and provides a ‘guide’ to the literature and where necessary directs the reader to more indepth reviews in the specific areas.
Tim O'Doherty
exaly +2 more sources
Abstract This paper reviews the studies undertaken on vortex breakdown over the past 45 years. The paper is structured such that the area is considered in three sections — experimental, numerical and finally theoretical, and provides a ‘guide’ to the literature and where necessary directs the reader to more indepth reviews in the specific areas.
Tim O'Doherty
exaly +2 more sources
Physics of Fluids, 1995
Reported herein is a cone-shaped turbulent vortex breakdown in noncavitating swirling flows at high Reynolds numbers in a slightly diverging cylindrical tube. The turbulent conical form is in addition to the well-known double-helix, spiral, and nearly axisymmetric or ‘‘bubble’’-type breakdowns.
exaly +2 more sources
Reported herein is a cone-shaped turbulent vortex breakdown in noncavitating swirling flows at high Reynolds numbers in a slightly diverging cylindrical tube. The turbulent conical form is in addition to the well-known double-helix, spiral, and nearly axisymmetric or ‘‘bubble’’-type breakdowns.
exaly +2 more sources
An experimental investigation into vortex breakdown and vortex breakdown control
2021This thesis was scanned from the print manuscript for digital preservation and is copyright the author. Researchers can access this thesis by asking their local university, institution or public library to make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
openaire +1 more source
Fluid Dynamics, 1995
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire +2 more sources
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire +2 more sources
Two-Vortex Models for Vortex Breakdown
ASME 2008 Dynamic Systems and Control Conference, Parts A and B, 2008A simple Hamiltonian dynamical systems model for vortex breakdown of the bubble-type (B-type) is developed and analyzed. This model is constructed using the flow induced by two point vortices moving in a half-plane immersed in an ideal (= inviscid and incompressible) fluid with an ambient uniform horizontal velocity.
Blackmore, D. +2 more
openaire +2 more sources
The Physics of Fluids, 1969
The Navier-Stokes equations for incompressible rotationally symmetric vortex flow at high swirl and large core Reynolds number are shown to approximate to the equation of inviscid rotating flow in regions where axial gradients are large. This equation becomes linear for flow originally near the axis, where rigid rotation results from viscous action ...
openaire +2 more sources
The Navier-Stokes equations for incompressible rotationally symmetric vortex flow at high swirl and large core Reynolds number are shown to approximate to the equation of inviscid rotating flow in regions where axial gradients are large. This equation becomes linear for flow originally near the axis, where rigid rotation results from viscous action ...
openaire +2 more sources
Vortex Breakdown as a Catastrophe
1998By studying swirling viscous jets, we develop a new explanation of vortex breakdown, show how solution non-uniqueness appears through cusp and fold catastrophes as the Reynolds number Re increases, and obtain analytical solutions for Re → ∞. Although inviscid theories also involve fold catastrophe, they have a strong limitation: the dependence of the ...
Vladimir Shtern, Fazle Hussain
openaire +1 more source
Technical Physics Letters, 1997
A new type of propagating perturbations on a vortex filament-traveling vortex breakdown-has been observed experimentally. A method of controlled external action on a vortex flow with known parameters is used. Data are obtained on the absolute propagation velocity of the perturbations as a function of the conditions in the vortex chamber, which ...
S. V. Alekseenko, S. I. Shtork
openaire +1 more source
A new type of propagating perturbations on a vortex filament-traveling vortex breakdown-has been observed experimentally. A method of controlled external action on a vortex flow with known parameters is used. Data are obtained on the absolute propagation velocity of the perturbations as a function of the conditions in the vortex chamber, which ...
S. V. Alekseenko, S. I. Shtork
openaire +1 more source
19th AIAA, Fluid Dynamics, Plasma Dynamics, and Lasers Conference, 1987
In this paper, steady, axisymmetric inviscid, and viscous (laminar) swirling flows representing vortex breakdown phenomena are simulated using a stream function-vorticity-circulation formulation and two numerical methods. The first is based on an inverse iteration, where a norm of the solution is prescribed and the swirling parameter is calculated as a
M. HAFEZ +3 more
openaire +1 more source
In this paper, steady, axisymmetric inviscid, and viscous (laminar) swirling flows representing vortex breakdown phenomena are simulated using a stream function-vorticity-circulation formulation and two numerical methods. The first is based on an inverse iteration, where a norm of the solution is prescribed and the swirling parameter is calculated as a
M. HAFEZ +3 more
openaire +1 more source
18th Fluid Dynamics and Plasmadynamics and Lasers Conference, 1985
A vortex breakdown was simulated by the vortex filament method, and detailed figures are presented based on the results. Deformations of the vortex filaments showed clear and large swelling at a particular axial station which implied the presence of a recirculation bubble at that station.
Y. NAKAMURA, A. LEONARD, P. SPALART
openaire +1 more source
A vortex breakdown was simulated by the vortex filament method, and detailed figures are presented based on the results. Deformations of the vortex filaments showed clear and large swelling at a particular axial station which implied the presence of a recirculation bubble at that station.
Y. NAKAMURA, A. LEONARD, P. SPALART
openaire +1 more source