IUTAM symposium on simulation and identification of organized structures in flows. Proceedings of the symposium held in Lyngby, Denmark, May 25--29, 1997
The titles of papers presented in this collection under 10 main heading are as follows: I. Flow control: 1. \textit{J. Kim}, Taming near-wall streamwise vortices: a modus operandi for boundary-layer control; 2. \textit{A. Orellano} and \textit{H. Wengle}, Visualization of coherent structures in manipulated turbulent flow over a fence; 3. \textit{P. S. Larsen}, \textit{U. Ullum} and \textit{J. J. Schmidt}, Experimental study of spatial structures in fence-on wall testcase. II. Coherent structures in wall-bounded flows: 4. \textit{J. Jimenz} and \textit{A. Pinelli}, Dynamics of the structures of near-wall turbulence; 5. \textit{S. Makita} and \textit{K. Sassa}, Three-dimensional configuration of a large-scale coherent vortex in a turbulent boundary layer; 6. \textit{W. Schoppa} and \textit{F. Hussain}, Formation of near-wall streamwise vortices by streak instability. III. Rotating flows: 7. \textit{H. I. Anderson}, Organized structures in rotating channel flows; 8. \textit{L. Lollini}, \textit{C. Cambon}, \textit{M. Michard} and \textit{L. Craftieaux}, Simulation and identification of organized vortices in rotating turbulent flows; 9. \textit{E. A. Christensen}, \textit{N. Aubry} and \textit{J. N. Sørensen}, On the space-time structure of axisymmetric rotating flows; 10. \textit{A. Spohn}, Observations on the early transition process in a closed cylindrical container with rotating bottom; 11. \textit{J. A. van de Konijnenberg}, \textit{A. H. Nielsen}, \textit{R. de Nijs}, \textit{J. J. Rasmussen} and \textit{B. Stenum}, Shear flow instability in a rotating fluid layer. IV. Small-scale turbulence and two-dimensional flows: 12. \textit{M. Tanahashi}, \textit{T. Miyauchi} and \textit{J. Ikeda}, Identification of coherent fine-scale structure in turbulence; 13. \textit{I. Hosokawa} and \textit{K. Yamamoto}, Evolution of vortical structure in isotropic turbulence; 14. \textit{J. R. Angilella} and \textit{J. C. Vassilicos}, Fractal and spiral organized structures: spectra and diffusion. V. Geostrophic and stratified flows: 15. \textit{G. R. Spedding}, Vortex waves in stably-stratified fluids; 16. \textit{X. J. Carton} and \textit{S. M. Correard}, Baroclinic tripolar geostrophic vortices; 17. \textit{S. M. Correard} and \textit{X. J. Carton}, Vertical alignment of geostrophic vortices; 18. \textit{F. O. Vandermeirsch}, \textit{X. J. Carton} and \textit{Y. G. Morel}, The interaction of a vortex with a stable jet. VI. Topological aspects: 19. \textit{M. Brons}, Streamline topology of axisymmetric flows; 20. \textit{U. C. Dallmann}, \textit{H. Vollmers} and \textit{W. H. Su}, Flow topology and tomography for vortex identification in unsteady and in three-dimensional flows; 21. \textit{R. M. Kiehn}, Coherent structures in fluids are topological torsion defects; 22. \textit{L. M. Portela}, The vortex concept and its identification in turbulent boundary layer flows. VII. Experimental techniques: 23. \textit{S. Aubrun}, \textit{H. H. Minh}, \textit{H. Boisson}, \textit{P. Carles} and \textit{J. Coulomb}, Coherent structure identification in separated and free mixing layers using hot wire rakes; 24. \textit{A. M. Fincham}, Three-dimensional measurement of vortex structures in stratified fluids flows; 25. \textit{P. G. Esposito}, \textit{T. Zhou}, \textit{R. A. Antonia} and \textit{P. Orlandi}, Direct numerical simulation of a turbulent channel flow to guide vorticity measurements in the wall region; 26. \textit{D. S. Nobes}, \textit{G. J. R. Newbold} and \textit{Z. T. Alwahabi}, Quantitative planar imaging of large structures developed through the precession of a jet. VIII. Vortical structures: 27. \textit{O. Inoue} and \textit{Y. Hattori}, Formation of rings in helicopter rotor flow fields; 28. \textit{K. Toyoda} and \textit{R. Hiramoto}, Three-dimensional structure and diffusion mechanism of an excited rectangular jet; 29. \textit{K. Tsujimoto} and \textit{Y. Miyake}, Identification of strong, near-wall quasi-streamwise vortices and their behavior; 30. \textit{H. Persillon}, \textit{M. Braza} and \textit{C. Williamson}, Three-dimensional coherent structures in the flow around a circular cylinder by direct numerical simulation. IX. POD, LSE and other techniques: 31. \textit{S. Tardu}, Detection and identification of near-wall coherent structures through conditional sampling; 32. \textit{J. H. Citriniti} and \textit{W. K. George}, Organized structure dynamics in a turbulent round jet; 33. \textit{D. Ewing} and \textit{J. H. Citriniti}, Examination of a LSE/POD complementary technique using single and multi-time information in the axisymmetric shear layer; 34. \textit{D. Faghani}, \textit{A. Sevrain} and \textit{H. C. Boisson}, Conditional vortical structures of a plane jet based on the complementary LSE/POD technique; 35. \textit{B. H. Jørgensen}, Application of POD to PIV images of flow over a wall-mounted fence; 36. \textit{V. Naulin}, Structure detection in driven drift wave turbulence; 37. \textit{P. Muscat}, \textit{P. Dussouillez}, \textit{P. Dupont} and \textit{J. Liandrat}, A coherent structure detection method using the wavelet transform. X. Low-dimensional modelling: 38. \textit{L. S. Ukeiley} and \textit{M. N. Glauser}, Multi-point measurements and low-dimensional models: tools for the characterization and control of turbulent flows; 39. \textit{R. Lardat}, \textit{A. Dulieu}, \textit{W. Z. Shen}, \textit{L. TaPhuoe}, \textit{C. Tenaud}, \textit{L. Cordier} and \textit{J. Delville}, Large eddy simulation of a spatially developing three-dimensional shear layer in incompressible flow: comparisons with detailed experiments; 40. \textit{L. Cordier}, \textit{J. Delville} and \textit{J. Pecheux}, Low-dimensional study of the flow between two counter-rotating disks; 41. \textit{G. Sciortino}, \textit{M. Morganti} and \textit{M. A. Boniforti}, Sinuous and varicose modes in phase-locked interaction; 42. \textit{M. Abdel-Rohman}, Analytical identification of galloping effects on prismatic bodies; 43. \textit{M. Rajkovic}, Multiresolution local adaptive method for the analysis of spatially extended systems; 44. \textit{M. Manhart}, Energy transfer between coherent structures in the wake of a hemisphere. The first paper delivered by \textit{J. Kim} is a review of his research work carried out with his associates' help. It is reported that turbulence in wall-bounded shear flows is strongly affected by the near-wall region. Most production and dissipation of the kinematic energy take place in the buffer layer, and turbulence control of drag reduction in turbulent boundary layers is essential. Authors' group has developed two different methods to control the turbulence: neural networks, and suboptimal control theory. The applications of these methods to low Reynolds number turbulent channel numerical experiments indicate that both approaches yield substantial drag reduction. The authors claim that their results are promising. The second paper by \textit{A. Orellano} and \textit{H. Wengle} presents large eddy simulations of a fully developed turbulent boundary layer flow over a surface-mounted fence at Reynolds number about 3000. In the third paper, the authors describe an experimental study of the effects of upstream periodic perturbations on the extent and structure of downstream-separated region in a two-dimensional flow past a wall-mounted fence. The fourth paper by \textit{J. Jimenez} and \textit{A. Pinelli} uses numerical experiments on modified turbulent channels to differentiate between possible turbulence generation mechanisms in wall-bounded flows. It is shown that a regeneration cycle exists which is local to the near-wall region and does not depend on the outer flow. It involves the formation of velocity streaks from advection of mean profile by streamwise vortices, and the generation of vortices from the instability of streaks. Interrupting any of those processes leads to the laminarization of the wall, and the production of secondary vorticity at the wall is not important for turbulence generation. In the fifth paper, the authors present a model to explain the occurrence of four well-known coherent structures in the outer turbulent boundary layer. The sixth paper employs numerical simulations of turbulent channel flows to present new insight into the formation of near-wall longitudinal vortices. In the seventh paper, \textit{H. I. Andersson} summarizes the major observations made in a series of computer experiments on rotating channel flows, emphasizing the influence of the Coriolis force on the organized flow structures. The eighth paper describes direct numerical simulations carried out to compare some earlier experimental results where turbulence was generated by an oscillating grid in a rotating tank. The effects of both rotation and confinement are analyzed for various Rossby and Reynolds numbers. In the ninth paper, the authors study the effect of rotation of the lid on fluid flow in a cylindrical container. Direct numerical simulations and spatio-temporal analysis of the axisymmetric flow are presented for various Reynolds numbers. The tenth paper reports on an experimental study of the transition in flow in a closed cylindrical container due to the rotation of the end wall. Different aspects of the flow are discussed. Experimental and numerical results on shear flow instability in a rotating fluid layer are topics of the eleventh paper. The experiments were performed on a shallow water layer in a parabolic tank. The twelfth paper identifies coherent fine-scale structures in homogeneous isotropic turbulence, and describes scaling law for coherent fine-scale structure in turbulent flows. In the thirteenth paper, \textit{I. Hosokawa} and \textit{K. Yamamoto} employ direct numerical simulations to study the evolution of vortical structure in decaying isotropic turbulence. The fourteenth paper analyses spectral and diffusive properties of fractal and spiral sets of delta functions corresponding to generic situations in turbulence. In the fifteenth paper, the author studies experimentally the initially turbulent wakes of towed spheres as the most simple case of wake turbulence of undersea objects, and also as a general example of the long-time evolution of a decaying turbulent patch in a stabilizing density field. The 16th paper presents a two-layer quasi-geostrophic ideal model of large anticyclonic vortices which are observed in reality as surface-intensified tripoles. In the 17th paper, the same authors study numerically this two-layer quasi-geostrophic model. The 18th paper describes nonlinear interactions between a zonal jet and a vortex by using one- and half-layer quasi-geostrophic numerical models. The 19th paper, \textit{M. Brons} examines bifurcations of streamline patterns in axisymmetric, incompressible viscous flow close to the axis. Coordinate transformations are used which reduce the number of nonlinear terms, and then numerical results are compared with experimental results. The author claims that more study is needed to fully understand the physical picture. The 20th paper presents a study of topological flow changes due to the breaking of symmetry. This is the basis of various flow instabilities, which are further investigated in this paper. In the 21st lecture, \textit{R. M. Kiehn} develops non-statistical theoretical methods to describe key features of turbulent flows. The 22nd paper discusses the inadequacy of the use of point concepts and dynamic concepts to define a vortex. In section VII, four papers give details of experimental techniques used to investigate turbulent flow. Four papers of section VIII are devoted to the study of vortex formation under different physical conditions (e.g. vortex rings in helicopter rotor flow fields, three-dimensional vortex structures in a rectangular jet, near-wall quasi-streamwise vortices, and vortex flows around a circular cylinder). In section IX, 7 papers describe different techniques to study turbulent structures. Finally, in section X, 7 papers are devoted to low-dimensional modelling of turbulent flows. In general, the present reviewer is of the opinion that the book can serve as a good source of information on turbulent flows, which are studied by different theoretical and experimental methods.
scientific article; zbMATH DE number 1381983