Results 81 to 90 of about 56,251 (190)
Calculation of aerodynamic characteristics of airplane configurations at high angles of attack [PDF]
Calculation of longitudinal and lateral directional aerodynamic characteristics of airplanes by the VORSTAB code is examined. The numerical predictions are based on the potential flow theory with corrections of high angle of attack phenomena; namely ...
Lan, C. Edward, Tseng, J. B.
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A numerical study of three-dimensional vortex breakdown [PDF]
A numerical simulation of bubble-type vortex breakdown using a unique discrete form of the full 3-D, unsteady incompressible Navier-Stokes equations was performed.
Ash, Robert L., Spall, Robert E.
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Helicity in axisymmetric vortex breakdown
, 2018 Vortex breakdown phenomena in the axial vortices is an important feature which occurs frequently in geophysical flows (tornadoes and hurricanes) and in engineering flows (flow past delta wings, Von-Kerman vortex dynamo). We analyze helicity for axisymmetric vortex breakdown and propose a simplified formulation.
Sharma, Manjul, Sameen, A
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Numerical simulation of vortex breakdown [PDF]
The breakdown of an isolated axisymmetric vortex embedded in an unbounded uniform flow is examined by numerical integration of the complete Navier-Stokes equations for unsteady axisymmetric flow.
Shi, X.
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Applied SciencesLaser-induced breakdown spectroscopy (LIBS), limited by matrix effects, self-absorption in complex samples, and ambient atmospheric influences, still requires further improvement in detection sensitivity and signal stability. In this work, the excitation
Yuxia Zhou +5 more
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Evidence for long-lived polar vortex air in the mid-latitude summer stratosphere from in situ laser diode CH4 and H2O measurements [PDF]
Atmospheric Chemistry and Physics, 2005 A balloon borne diode laser spectrometer was launched in southern France in June 2000 to yield in situ stratospheric CH4 and H2O measurements. In the altitude region ranging from 20km to 25km, striking large spatial structures were observed in the ...
G. Durry, G. Durry, A. Hauchecorne
doaj
In-flight flow visualization with pressure measurements at low speeds on the NASA F-18 high alpha research vehicle [PDF]
In-flight results from surface and off-surface flow visualizations and from extensive pressure distributions document the vortical flow on the leading edge extensions (LEX) and forebody of the NASA F-18 high alpha research vehicle for low speeds and ...
Delfrate, John H. +2 more
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Characterization of Swirling Flows in a Partly Open Cylinder
Journal of Applied Fluid Mechanics, 2016 A partly open vertical disk-cylinder system, with an annular top lid, is used to model numerically the characteristics of axisymmetric swirling flows with stagnation and associated flows reversal; commonly referred to as vortex breakdown.
Malika Imoula +3 more
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Three-dimensional simulation of vortex breakdown [PDF]
The integral form of the complete, unsteady, compressible, three-dimensional Navier-Stokes equations in the conservation form, cast in generalized coordinate system, are solved, numerically, to simulate the vortex breakdown phenomenon.
Kuruvila, G., Salas, M. D.
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Multiple paths to subharmonic laminar breakdown in a boundary layer [PDF]
Numerical simulations demonstrate that laminar breakdown in a boundary layer induced by the secondary instability of two-dimensional Tollmien-Schlichting waves to three-dimensional subharmonic disturbances need not take the conventional lambda vortex ...
Hussaini, M. Yousuff, Zang, Thomas A.
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