velocities, 43 and the stabilizing effect also appears for radial. inow through a single inner porous cylinder rotating within. hydrodynamics of convective and absolute instabilities
ABSOLUTE AND CONVECTIVE INSTABILITY OF CYLINDRICAL ABSTRACT. This article reports the absolute and convective instability of a cylindrical liquid jet in a co-flowing inviscid gas stream. An efficient mesh-searching method is developed to determine the absolute instability and the critical Weber number which separates the region of absolute from that of convective
This study investigates the inviscid, linear spatio-temporal stability of heated, compressible, and incompressible coaxial jet flows. The influence of the temperature ratio and the velocity ratio between the core jet and the bypass stream on the transition from convectively to absolutely unstable flows is studied numerically. The investigation shows that for coaxial jets, absolute instability
Absolute and convective instabilities of heated coaxial When the bypass-stream velocity is increased, the classical absolute mode known from single jets (inner mode) is first stabilized and then destabilized for high bypass-stream velocities, whereas the outer mode reaches maximum spatio-temporal growth rates when the core-stream velocity is approximately equal to twice the bypass-stream velocity.
Absolute versus convective instability of spiral wavesAbsolute and convective instabilities of spirals are investigated using the continuous and the so-called absolute spectrum. It is shown that the nature of transport, induced by an absolute instability, is determined by spectral data of the asymptotic wave trains. The results are applied to core and far-eld breakup of spiral waves
Absolute-convective instabilities and their associated wave packets in a compressible reacting mixing layer.Physics of Fluids A:Fluid Dynamics, 5(4), 901-915. doi:10.1063/1.858636. Absoluteconvective instabilities and their associated wave packets in a profile for the velocities, assuming an infinite rate reaction,
Against the wind:Physics of Fluids:Vol 11, No 10A. Couaironand J.-M. Chomaz, Absolute and convective instabilities, front velocities and global modes in nonlinear systems, Physica D 108, 236 (1997). , Google Scholar Crossref 17. A.
Brevdo Bridges Dias Laure 1999 - unice.frThe absolute or convective behavior of these instabilities is given by the long time asymptotic be- havior of the perturbation (9) for V = 0. If the instability has a convective nature, the long time asymptotic behav- ior of (9) for various values of V will give the structure, the front velocities and the spatial amplification of wave packet.
CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda):Electrokinetic flow instabilities occur under high electric fields in the presence of elec-trical conductivity gradients. Such instabilities are a key factor limiting the robust per-formance of complex electrokinetic bio-analytical systems, but can also be exploited for rapid mixing and flow control for microscale
Convective and absolute instabilities in the subcritical Convective and absolute instabilities in the subcritical Ginzburg-Landau equation Convective and absolute instabilities in the subcritical Ginzburg-Landau equation Colet, P.; Walgraef, D.; San Miguel, M. 1999-10-01 00:00:00 We study the nature of the instability of the homogeneous steady states of the subcritical real Ginzburg-Landau equation in the presence of group velocity.
Convective/absolute instability in miscible core-annular Moreover, the fixed location of this destabilization, observed for some particular parameters, suggests an absolute nature of the instability. We present a tentative delineation of the nature (convective or absolute) of the instability and discuss the accessible measurements to experimentally address this
The convective/absolute nature of the instability of miscible core-annular ow with These investigations focused on front propagation velocities, and on the fraction of the more viscous uid left behind on the wall. In a recent study, Selvam et al. (2007) Since the experimentally observed instabilities in part 1 are axisymmetric, we
GLOBAL INSTABILITIES IN SPATIALLY DEVELOPING FLOWSIt is then much more appropriate to develop a fully nonlinear formulation involving the presence of a front separating the base state region from the bifurcated state region. Keywords:absolute/convective instabilities, transient growth, fronts, Global modes, passive and active control. The shear velocities are v = 0 (a), v = 0.1 (b), and v
Instabilities of the von Kármán Boundary Layer Applied May 01, 2015 · Absolute and Convective Instabilities in Free Shear Layers, J. Fluid Mech., 159, pp. Absolute and Convective Instabilities, Front Velocities and Global Modes in Nonlinear Systems, Physica D, 108 (3), pp.
Jan 11, 2007 · Couairon A, Chomaz J-M (1997) Absolute and convective instabilities, front velocities and global modes in nonlinear systems. Physica D 108:236276 zbMATH CrossRef ADS MathSciNet Google Scholar Couairon A, Chomaz J-M (1999) Fully nonlinear global modes in slowly varying flows.
Transition from absolute to convective instability in a The absolute-convective instabilities on the round jets without  and with confinement  can be recovered if the outer medium is ignored from the present study. ABSOLUTE INSTABILITY IN PLASMA JETinstabilities. The absolute/convective nature of instabilities has been exhaustively studied for hot round jets, notably to improve aircraft propulsion performances. Monkewitz and Sohn in  showed that absolute instability arises in jet pro les with a density (or tem-perature) ratio under S e = c= 1 = 0.72 at the nozzle exit. Furthermore