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Separated flows and jets are closely linked in a variety of applications. They are of great importance in various fields of fluid mechanics including vehicle efficiency, technical branches concerned with gas/liquid flows, atmospheric effects on various constructions, etc. Knowledge of the physics of separated flows and jets and the development of reliable control techniques are prerequisite for future progress in the field. These aspects were in focus during the IUTAM-Symposium which was held in Novosibirsk, 9-13 July, 1990. This volume contains a selection of papers presenting recent results of theoretical and numerical studies as well as experimental work on separated flows and jets. The topics include sub- and supersonic, laminar and turbulent separation as well as organized structures in separated flows and jets. The reader will find here the state of the art and major trends for research in this field of aero-hydrodynamics.

Separated Flows and Jets: IUTAM-Symposium, Novosibirsk, USSR July 9-13, 1990

Session 1 Chairman J.L. van Ingen.- Analysis of simulations of topologically changing three-dimensional separated flows.- Belotserkovsky O.M. Gushin V.A. Direct numerical modelling: steady separation, coherent structures and transition to chaos.- Numerical simulation of separated flows by the splitting up method.- Break-up in steady and unsteady separation.- On Goldstein's singularity.- Marginal separation theory.- Effects of 3-D surface mounted obstacles on marginal separation.- Session 2 Chairman O. S. Ryzho.- Discontinuous solutions of boundary layer equations with positive pressure gradient.- Computation of trailing-edge separation using an accelerated, updated bluff-body, interacting boundary-layer algorithm.- Self-similar separation.- Digital simulation of separated and jet flows using discrete vortex method.- Poster session.- Topology of fundamental separation structures.- Basic equations of vortex fluid motion. Vortex-wave resonance.- Numerical investigation of turbulent separated flows in the near wake after body.- Asymptotic theory of the stationary flow around bluff bodies.- Modeling of the flows with 3-D separation caused by interaction of the boundary layers on the intersecting surfaces.- Numerical simulation of the separated fluid flows at large Reynolds numbers.- A boundary layer near small three- dimensional roughnesses in a supersonic flow about a cooled body.- Interaction theory and non-uniqueness of separated flows around solid bodies.- Finite element simulation of unsteady separated flows.- Explanation of the origin of the secondary flow in a straight square duct on the Basis of LES.- Spatial vortex structures and heat transfer in a channel having a step.- Some investigation results for vortex-potential inviscid fluid flows.- A simulation of the wing leading-edge vortex and its entrainment effect.- Numerical simulation of the vortex chain formation by vorticity shedding from a sphere into the wake.- Asymptotic theory of a flow near the trailing tip of a slender axisymmetric body.- Numerical solution of 2-D Helm-holtz problem for blunt bodies and airfoils.- Numerical modeling of 3-D turbulent flows in mixers.- Three-dimensional viscous-inviscid interactions for turbulent flows with separation.- Session 3 Chairman M. Kiya.- Turbulence in incompressible separated flows.- Separated flows in diffuser ducts.- Structure of turbulent separating flow in two-dimensional diffusor.- A study on mode of 3-dimensional separation and open separation.- Peculiarities of development and modelling possibilities of supersonic turbulent separated flows.- Supersonic separation zone pressure fluctuations for wide range of Reynolds number.- Turbulence modeling for sharp-fin-induced shock wave/turbulent boundary-layer interactions.- On the shock-bifurcation/jet- impingement structure of swept interactions and related flow- fields.- Calculation of 3-D shock wave-turbulent boundary layer inter-actions generated by sharp fins.- Session 4 Chairman F. T. Smith.- Flowfield modeling of a three-dimensional shock wave turbulent boundary layer interaction.- Development of 3-D separated flows by longitudinal supersonic flow over the corner configurations.- Leeward separated supersonic flows.- Experimental and numerical studies of separated flows about slender axisymmetrical bodies.- Poster session.- Experimental and numerical investigations on turbulent separated diffuser flows.- Analysis of turbulent separated flows in the vicinity of two-dimensional obstacles under supersonic speeds conditions.- Non-stationary structure at separation and turbulent flow attachment zones.- Some features of a separated flow and supersonic vortex structure at the leeside of a delta wing.- Separated flow around a delta wing in combination with a body.- Separated flow in a straight compressor cascade.- Secondary corner and channel flow effects on shock induced turbulent flow separation.- Development of two-dimensional analogies comformably to three-dimensional separated flows.- Three-dimensional open separation in supersonic flows.- Investigation of compressible turbulent boundary layer with large adverse pressure gradient..- The critical phenomena in separated flows.- Nonstationary disturbance effect on flow in supersonic separated zones.- Peculiarities of development of separated and relaxation phenomena behind a cylinder flowed about transversally in a shear flow.- Numerical and experimental simulation of separated flows.- Some separation characteristics on the ogive nosed body at supersonic flows ) Li S. Xiaoshen Yu. Nanqian Ch..- Influence of flow separation on transonic instability.- Numerical simulation of separated unsteady flows of viscous compressible gas.- An experimental study of separated flows in transonic blade cascades.- Longitudinal vortices and heat transfer in reattached shear layer.- Forming of flow recirculation regions on convex-concave surfaces..- Supersonic pulsating flow in separated zone of spike-tipped cylinder.- Session 5 Chairman A. Michalke.- Comparative study of control techniques for two-dimensional low-speed turbulent flow separation.- A study of the interaction of separated vortices in transonic and supersonic flow on improving the aerodynamic characteristics of vortex-flap.- Supersonic turbulent separated flows of three types on a porous surface under air injection conditions.- The flow separation from a duct wall caused by the near-wall counterjet.- Wave models for unsteady separation and jets.- Poster session.- Axisymmetrical separated zone control in supersonic flows.- Using of supersonic flow separation on cylinders with nose needles to decrease their drag.- Control of separated laminar boundary layers on surfaces with a concave section.- Separated flow reattachment at an airfoil under sonic effect.- Regimes of separated flows in finite-width cavities and methods of their control.- A jet-turbulent "pseudo-shock" model.- Session 6 Chairman V. Ya. Levchenko.- Laminar separation and stability. ) V. V. Kozlo.- Research on laminar separation bubbles at Delft University of Technology.- On the instability of wall-boundary layers close to separation.- Effects of laminar-turbulent transition in separation bubbles.- Experimental studies of the re-attachment of separated shear layers.- Effect of heat transfer on the stability of separated subsonic flows down-stream of smooth humps and backward-facing steps.- Numerical simulations of two-dimensional temporal and spatial free shear layers: a comparison.- Three-dimensional evolution of axisymmetric jets: a comparison between computations and experiments.- Control of a turbulent leading-edge separation bubble.- Session 7 Chairman M. A. Goldshtik.- The local dynamics of vortical flows Leibovich S. ).- Self-induced roll-oscillations on lifting systems with flow separation on high angles of attack.- Small eddies in large vortices.- Hydrodynamic visualization of separated flows and jets.- A numerical and experimental study of the starting flow of a uniformly accelerated circular cylinder.- Poster session.- Experimental and theoretical investigation of vortex formation in the wake of a flat plate for subsonic and supersonic free-stream Mach number.- The instantaneous structure of a turbulent flow over a backward-facing step.- Influence of acoustic disturbances on the separation flow characteristics behind two semi- infinite circular cylinders.- Asymptotic analysis of the development of Görtler vortices in a fluid boundary layer near a concave surface.- Separation-transition effects on a cylinder with a screen.- Features of the unsteady separated flow behind flat plates after a shock wave excitation.- The development of 3-D separated flows and their influence on the stability and laminar-turbulent transition.- The boundary layer turbulization by means of an obstacle at large flow-past velocities ) Kiselev V. Ya. Lysenko V. I..- Experimental investigation of separation and stability of supersonic laminar boundary layer.- Processes of the instability development in separated flows behind the plate.- Separation of flow around a circular cylinder at moderate Re-numbers.- Computational studies on topological properties of vortex core lines in separated flow field around high-angle-of-at-tack cone-cylinders.- Stability of separated flow before and after the small step Terentiev E. D.).- Formation of vortex structures in a viscous incompressible flow past an airfoil.- Laws of generation of instability waves in laminar separation of the flow from the airfoil) Zanin B. Yu..- Session 8 Chairman Ch.-M. Ho.- Organized structures in jets and mixing layers ) Hussain F..- The investigation of the role of the coherent structures in the development of the three- dimensional jets and wakes.- Vortex interactions in the transition region of a rectangular jet.- Two manners of becoming three-dimensional for mixing layers.- The simulation of turbulent separated boundary layers and wall jets.- Mixing of transverse jets and wall jets in supersonic flow.- Poster session.- Numerical simulation of supersonic free jet by TVD schemes.- Interaction of plane, turbulent jets.- Parametric analysis of acoustic near field characteristics of supersonic high temperature jet.- Afterbody effects study on Energia reusable launcher models. Selection of jet propulsive masses parameters within jet streams ejecting model.- Tangential stress on a cylinder surface impinged by a underex-panded low density jet.- MHD-jets: collapse and dynamo.- An experimental investigation in a water channel for the vectoring rectangular jet flows.- The impingement of a supersonic jet upon the surface.- Self-oscillations and acoustic radiation at discrete frequency of unbalanced jet.- Some behaviours of coherent structures under controlled excitation in coaxial jet of mean velocity ratio of 0.3.- An autooscillating regime of supersonic jet interaction with a cavity.- A high-resolution, adaptive- grid finite difference algorithm for simulating supersonic jet/external flow interactions.- Appearance of the back flow in the non-selfsimilar swirling jet.- Three-dimensional structures of the flow in supersonic underexpended jet.