Abstracts - KTH Mechanics

More documents

Recommendations

Info

146 Mixing by merging Kelvin-Helmholtz billows M. D.Patterson ∗ , J. N.McElwaine ∗ , C. P.Caulfield † and S. B. Dalziel ∗ Quantitative time dependent measurements of the irreversible mixing caused by the development, saturation and turbulent breakdown of Kelvin-Helmholtz (KH) billows on an initially stable two layer stratification of miscible fluids are taken from a series of laboratory experiments. The experiments are carried out in a tilting tank similar to that used by Thorpe 1 . The initial conditions consist of a two layer stratification of fresh water, ρ1, and a dyed saline solution, ρ2, whereρ1
Scattering of linear Rossby waves by abrupt topography Gareth W. Owen ∗ ,I.DavidAbrahams † and Andrew J. Willmott ∗ Planetary Rossby waves propagate across the world’s ocean basins. They play a vital rôle in the long term distribution of ocean vorticity and to the oceans’ rapid adjustment to atmospheric and climatic variability. Knowledge of the interaction between these waves and topography is crucial to a full understanding of this process, and hence to the transportation of energy, mixing and ocean circulation. Previously, the interaction of baroclinic Rossby waves with abrupt topography was modelled using barotropic or simple layered models. Here a more realistic model is employed, with a continuously stratified fluid of buoyancy frequency N(z). The topographic variation consists of a ‘top-hat’ ridge of infinitesimal or finite width. The quasi-geostrophic streamfunction, ψ, satisfies the linear Rossby wave equation ∂ ∂t ∂ 2 ψ ∂x2 + ∂2ψ ∂ + ∂y2 ∂z f 2 N 2 ∂ψ ∂z + β ∂ψ ∂x =0. The vertical modes satisfy a Sturm-Liouville eigenvalue problem, which predicts a qualitatively different modal structure than that of layered models. Applying a mode matching technique results in a singular algebraic system of equations. This is solved using a novel method in order to determine the scattering coefficients. In the case where this algebraic method breaks down we employ matched asymptotic expansions. We consider two ideal stratifications: a constant buoyancy frequency 1 and a buoyancy frequency that decays exponentially with depth 2 . It is found that the scattered field depends crucially upon the stratification. When the density variation is confined to a thin thermocline a large amount of the incident wave energy is reflected by a small ridge. Appreciable energy conversion between the propagating modes takes place in this case and the scattered field differs markedly from the two-layer solution. ∗ Mathematics, Keele University, Keele, Staffs. ST5 5BG, UK. † Mathematics, University of Manchester, Manchester M13 9PL, UK. 1 Owen, Abrahams, Willmott and Hughes, J. Fluid Mech. 465, 131 (2002). 2 Owen, Willmott, Abrahams and Mansley, Geophys. and Astrophys. Fluid Dyn. 99, 219 (2005). Figure 1: Satellite altimetry data reveals strong Rossby wave activity in regions close to ocean ridges. Phase shifts are consistent with conversion between baroclinic modes. 147
Page 1:
EFMC6 KTH Electronic version Abstra
Page 5:
Euromech Fluid Mechanics Lecturer H
Page 8 and 9:
ii Continuum Models in Industrial A
Page 10 and 11:
iv Slip Behavior at Liquid/Solid In
Page 12 and 13:
vi ¡ £ ¥ § © £ § £
Page 14 and 15:
viii Premixed Turbulent combustion
Page 17:
Session 1
Page 20 and 21:
2 Global stability of jets and sens
Page 22 and 23:
4 Control of instabilities in a cav
Page 24 and 25:
6 The dispersal, decay and instabil
Page 26 and 27:
8 Steady and pulsatile flow through
Page 28:
10 Pulsatile flows in pipes with fi
Page 31 and 32:
Global stability of the rotating di
Page 33 and 34:
Continuous Spectrum Growth and Moda
Page 35 and 36:
The influence of centrifugal buoyan
Page 37 and 38:
Prediction of wall bounded flows us
Page 39 and 40:
Uncertainty Quantification in Large
Page 41 and 42:
Stratified turbulence G. Brethouwer
Page 43 and 44:
Investigations of turbulence statis
Page 45 and 46:
Coupling weather-scale flow with st
Page 47 and 48:
Flow Separation from a Free Surface
Page 49 and 50:
Phase-Field Simulations of Free Bou
Page 51 and 52:
Evaluation of a universal transitio
Page 53 and 54:
Computations of turbulent boundary
Page 55 and 56:
Flow Developments in Smooth Wall Ci
Page 57 and 58:
Super-late stages of boundary-layer
Page 59 and 60:
Low-speed streaks developing at the
Page 61:
Direct Numerical Simulation of Lami
Page 64 and 65:
44 Axisymmetric absolute instabilit
Page 66:
46
Page 69 and 70:
Application of the ray-tracing theo
Page 71 and 72:
Leaky Waves in Supersonic Boundary
Page 73 and 74:
Solving turbulent wall flow in 2D u
Page 75 and 76:
55 Development of a 3D transient in
Page 78 and 79:
58 Upper bounds for the long-time a
Page 80 and 81:
60 Numerical Simulations of Rigid F
Page 82 and 83:
62 On the translational and rotatio
Page 84 and 85:
64 A Shell-Model Study of Turbulent
Page 86 and 87:
66 Using CSP for Modeling Burgers-T
Page 88 and 89:
68 High Spatially Resolved Velocity
Page 91:
Dynamic Lift of Airfoils R. Grüneb
Page 94 and 95:
72 Experimental study on the bounda
Page 96 and 97:
74 Natural sinuous and varicose bre
Page 99 and 100:
Numerical simulation of the three-d
Page 101 and 102:
Effects of the flexibility of the a
Page 103 and 104:
Wave forerunners of longitudinal st
Page 105 and 106:
Stability and sensitivity analysis
Page 107 and 108:
Stability of reacting gas jets Jose
Page 109 and 110:
Elastocapillarity in wet hairs J. B
Page 111 and 112:
Open Capillary Channel Flows (CCF):
Page 113:
Stick-slip motion of droplets of co
Page 116 and 117:
94 A general theory for stratified
Page 118 and 119:
96 £ ¥ § © £ ¥ ©
Page 120 and 121:
98 The influence of the density max
Page 122 and 123: 100 TRANSIENT DISPLACEMENT OF A NEW
Page 124 and 125: 102 Experimental study of the effec
Page 126 and 127: 104 Nu Numerical modeling of heat t
Page 128 and 129: 106 Turbulent thermal convection ov
Page 130 and 131: 108
Page 132 and 133: 110 Modelling of optimal vortex rin
Page 134 and 135: 112 The effect of a sphere on a swi
Page 136 and 137: 114 Three-dimensional stability of
Page 139 and 140: Session 4
Page 141 and 142: 117
Page 143 and 144: Nonlinear long waves on an interfac
Page 145 and 146: Three-dimensional gravity-capillary
Page 147 and 148: Linear and non-linear theory of lon
Page 149 and 150: Surface oscillations of liquid nitr
Page 151 and 152: Waves above turbulence R. Savelsber
Page 153 and 154: Figure 1 : Vorticity contours and s
Page 155 and 156: Investigation of flow structure upo
Page 157 and 158: Simultaneous density and concentrat
Page 159: Introduction of newly developed tow
Page 162 and 163: 136 A Simple Model for Gas-Grain Tw
Page 164 and 165: 138 Dynamics of heavy particles nea
Page 166 and 167: 140 Stability of dusty gas flow in
Page 168 and 169: 142 Joint fluid-particle pdf modeli
Page 170 and 171: 144 Three-dimensional stability of
Page 174 and 175: 148
Page 176 and 177: 150 a Institute of Thermophysics, 6
Page 178 and 179: 152 Direct numerical simulations of
Page 180 and 181: 154 Study of anisotropy in purely s
Page 182 and 183: 156 Direct numerical simulation of
Page 184 and 185: Assessment of a wavelet based coher
Page 186 and 187: Numerical study of turbulence in a
Page 188 and 189: 162
Page 190 and 191: 164 Flowcontrol with crosswise grov
Page 192 and 193: 166 Experiments on the reverse Bén
Page 194 and 195: 168 Kinematic-dynamic correspondenc
Page 196 and 197: 170 Three-dimensional structures in
Page 198 and 199: 172 Lagrangian (physical) analysis
Page 201 and 202: The evolution of energy in flow dri
Page 203 and 204: 175
Page 205 and 206: Mechanisms of gas migration through
Page 207 and 208: Surface waves in coupled channels a
Page 209 and 210: Validation of urban dispersion simu
Page 211 and 212: Numerical study of flow patterns in
Page 213 and 214: Generation of metal nanodroplets an
Page 215 and 216: Oscillations of Thin Liquid Shells
Page 217 and 218: 3D chaotic mixing inside drops driv
Page 219 and 220: The interaction between negatively
Page 221 and 222: Coherent Large-Scale Structures and
Page 223 and 224:
Turbulent mixing in the entry regio
Page 225 and 226:
|P|max 0.16 0.14 0.12 0.1 0.08 0.06
Page 227 and 228:
Experiments on vortex pair dynamics
Page 229:
List of authors Ordinary lectures a
Page 232 and 233:
LIST OF AUTHORS Borel H. 340 Castro
Page 234 and 235:
LIST OF AUTHORS Glezer A. 259 Haspa
Page 236 and 237:
LIST OF AUTHORS Lebon L. 238, 266 M
Page 238 and 239:
LIST OF AUTHORS Poplavskaya T. V. 4
Page 240:
LIST OF AUTHORS Tuzi R. 11 Wolters
show all

Abstracts - KTH Mechanics

Create successful ePaper yourself

Delete template?

Save as template?