This plenary paper and the accompanying presentation have highlighted field problems involving fluid-structure interaction over a wide span of Navy operations. Considering the vast size and versatility of the Navy's inventory, the cases presented represent examples of a much larger problem. But even this limited set provides sufficient evidence that fluid-structure interaction does hinder the Navy's ability to accomplish its missions. This survey has also established that there are no accurate and generally applicable design tools for addressing these problems. In the majority of cases the state-of-practice is to either make ad-hoc adjustments and estimates based on historical evidence, or conduct expensive focused tests directed at each specific problem and/or candidate solution. Unfortunately, these approaches do not provide insight into the fundamental problem, and neither can be considered reliable regarding their likelihood of success. So the opportunities for applying computational fluid-structure interaction modeling to Navy problems appear limitless. Scenarios range from the "simple" resonant strumming of underwater and in-air cables, to the "self-contained" flow field and vibration of aircraft/ordnance bodies at various Mach numbers, to violent underwater transient detonations and local hull structural collapse. Generally applicable and computationally tractable design-oriented models for these phenomena are of course still far in the future. But the Navy has taken the first steps in that direction by sponsoring specialized numerical models, validation experiments tailored for specific applications, and conferences such as this one.

Klappentext

This Symposium, and these Proceedings, provided a forum for the latest thinking in analytical, computational and experimental modelling of structures interacting with fluid environments. A meaningful and lasting dialogue was facilitated between leading researchers in the different component disciplines. It is intended that, through these dialogues, multidisciplinary linkages will be establishes leading to integrated approaches to modelling the complex, nonlinear interactions between fluids and structures. Examples of classes of interactions that may be addressed in this Symposium include ocean structures, fluid conveying structures, and aerospace structures. The energy transfer processes are inherently nonlinear in all aspects of the behaviour. The important class of vortex-induced oscillations has regions of lock-in, where the structural natural frequencies rather than the fluid velocity govern the shedding, and there exists hysteretic behaviour. BR

Inhalt

1. Survey of Naval Computational Needs in Fluid-Structure Interaction (Plenary).- 2. Novel Use of a Bandwidth Measure for Vortex Induced Vibrations Case Study: The Foinaven Dynamic Umbilical.- 3. Chaotic Vibration-Based Damage Detection in Fluid-Structural Systems.- 4. Comparison of Two Seafloor Observatory Mooring Designs.- 5. Nonlinear Dynamics of Very High Dimensional Fluid-Structural Systems (Plenary).- 6. Flapping Membranes for Thrust Production.- 7. Experimental Study of a Tethered Cylinder in a Free Stream.- 8. The Effect of Changed Mass Ratio on the Motion of a Tethered Cylinder.- 9. Self-excited Oscillation of Equilateral Triangular Wedge.- 10. A Critical Review of the Intrinsic Nature of VIV (Plenary).- 11. A Numerical Study on the Rectilinear Oscillations of a Circular Cylinder.- 12. Three-Dimensional Modeling of Flow-Induced Vibration for an Elastic Cylinder in a Cross Flow.- 13. Correlation Length and Force Phasing of a Rigid Cylinder Subject to VIV.- 14. Self-Excited Oscillations of Vertical and Horizontal Cylinders in Presence of a Free-Surface.- 15. High Mode Number VIV Experiments (Plenary).- 16. Nonlinear Dynamics of Slender Cylinders Supported at Both Ends and Subjected to Axial Flow.- 17. Some Quandaries and Paradoxes in Fluid-Structure Interactions with Axial Flow (Plenary).- 18. Closed-Loop Control of the Resonant Flow-Structure Interaction Using PID Controllers.- 19. Vortex-Induced Vibration Structural Response under Parametric Excitation.- 20. Frequency Response and the Existence of a Critical Mass for an Elastically-Mounted Cylinder.- 21. Two-Degree of Freedom VIV of a Circular Cylinder Pinned at One End.- 22. Vortex-Induced Vibrations of Slender Structures in Shear Flow: A Review (Plenary).- 23. A Tuned Liquid Damper Model.- 24. Unstable Phenomena of a Thin Cylindrical Shell Subjected to Axial Leakage Flow.- 25. Acoustic Scattering from a Coated Elastic Shell: Exact Vs. Approximate Theory.- 26. A Study of the Vibration of Fluid Coupled Coaxial Cylindrical Shell.- 27. Stability and Non-Linear Dynamics of Clamped Circular Cylindrical Shells in Contact with Flowing Fluid.- 28. Forced Dynamic Uplift of Floating Plates.- 29. Low-Dimensional Feedback Control of the von Karman Vortex Street at a Reynolds Number of.- 30. Stochastic Bifurcations of the Duffing-Mathieu Equations with Time Delays.- 31. Numerical and Experimental Investigation of a Streamwise Oscillating Cylinder Wake in the Presence of a Downstream Cylinder.- 32. Control of Cylinder Drag and Lift Force Amplitude in Turbulent Crossflow.- 33. An Eulerian-Lagrangian Marker and Micro Cell Method for Simulating Fluid Interaction with Solid/Porous Bodies (Plenary).- 34. A New Lagrangian-Eulerian Shell-Fluid Coupling Algorithm Based on Level Sets.- 35. Application of Higher Order Runge-Kutta Time Integrators in Partitioned Fluid-Structure Interaction Simulations.- 36. Vortex Shedding for Flow Over a Square Cylinder Close to a Moving Ground.- 37. Extended Hamilton's Principle for Fluid-Structure Interaction.- 38. Estimation of Pressure Fields Using Velocity Measurements.- 39. Implicit Multigrid Computations of Unsteady Multiphase Flows in Varying Cross-Sectional Area Channels.- 40. Dynamic Stability of Stochastic Delay Systems.