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Vortex Shedding in Bridge Engineering

Vortex Shedding in Bridge Engineering. Kessock Bridge Case Study. Outline. Introduction of Bridge Aeroelasticity Research Methodology Kessock Bridge Background Experimentation Computational Simulation (CFD). Introduction. Bridge Failures in the History (wind-induced instabilities)

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Vortex Shedding in Bridge Engineering

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  1. Vortex Shedding in Bridge Engineering Kessock Bridge Case Study

  2. Outline • Introduction of Bridge Aeroelasticity • Research Methodology • Kessock Bridge Background • Experimentation • Computational Simulation (CFD)

  3. Introduction • Bridge Failures in the History (wind-induced instabilities) • Menai Strait Bridge; Bright Chain Pier; Tay Bridge (UK) • Deer Isle Bridge; Golden Gate Bridge (US) • Tacoma Narrows Bridge (Benchmark) • Classical Flutter Theory (Theodorsen) • Flight Failures (wing and wing-aileron flutter) • Langley’s Aerodome/monoplane flight failure • Fokker D-8 wing failures (1st world war)

  4. Bridge Aeroelasticity • Flutter – Theories by R.H.Scanlan; • Buffeting – Theories by A.G.Davenport; • Vortex Induced Oscillation (VIO) • Lock-in Phenomenon; • Galloping; • Static Divergence; • Aim of Project Understanding the Physics of Vortex Induced Oscillation & Lock-in in Bridge Aeroelasticity

  5. Research Methodology • Available Research Techniques • Analytical Method • Experimental Method • Computational Simulation (CFD) • Methodology • Comparison of Experimental and CFD Results; • Parametric Study via CFD;

  6. Kessock Bridge Background • Located in Inverness Scotland; • Encounters Relatively Strong Wind due to Local Topology • Central Span 240m; • Inverted U-shape Deck Cross-section  Aerodynamically and Aeroelastically Unstable; • Full Scale Measurement (10.1991-05.1992 by Owen et.al) • Wind Tunnel Test (Dec.2003 UoN in UK & NTU in Sg) • CFD Computational Simulation (in progress)

  7. Experimentation • Wind Tunnel Test • Collaborative Experiment – University of Nottingham and NangYang Technological University • 1:40 Scale Sectional Model of Kessock Bridge • Force Coefficients vs. Angles of Attack • Comprehensive Full Scale Data • Verification of Experimental Data

  8. Computational Fluid Dynamics (CFD) • Based on Navier-Stokes Equation; • Spatial and Temporal Discretisation; • Turbulence Modelling :- • Reynolds-Averaged Navier-Stokes (RANS) • Detached Eddy Simulation (DES) • Large-Eddy Simulation (LES) • Direct Numerical Simulation (DNS)

  9. CFD Simulation • 1/40 Sectional Model – Wind Tunnel Model • SST and DES Turbulence Scheme • Fine Hexahedral Mesh (0.8m-3.7m cells) • O-Grid Construction • Non-conformal General Grid Interface (GGI)

  10. Mesh Independence Test • SST Model • Angles of Attack - ±10° (2° increment); • Lift and Drag Coefficients; • Hexahedral Meshes :- • 0.8m, 1.3m and 3.7m cells; • Different Arrangement of Cell Structure; • DES for Parametric Study

  11. Parametric Study • DES Run :- • Finer Mesh; • Wind Speed and Direction Effects; • Varying Turbulence Intensity; • Fluid Structure Interaction; • Implication of Computation Facility :- • Accuracy of Simulation; • Realisticity of Simulation;

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