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Scheda Riassuntiva
Anno Accademico 2017/2018
Scuola Scuola di Ingegneria Industriale e dell'Informazione
Insegnamento 051137 - WIND ENGINEERING
Docente Diana Giorgio
Cfu 6.00 Tipo insegnamento Monodisciplinare

Corso di Studi Codice Piano di Studio preventivamente approvato Da (compreso) A (escluso) Insegnamento
Ing - Civ (Mag.)(ord. 270) - MI (488) INGEGNERIA CIVILE - CIVIL ENGINEERING*AZZZZ051137 - WIND ENGINEERING
091100 - INGEGNERIA DEL VENTO
Ing Ind - Inf (Mag.)(ord. 270) - BV (469) AERONAUTICAL ENGINEERING - INGEGNERIA AERONAUTICA*AZZZZ091100 - INGEGNERIA DEL VENTO
Ing Ind - Inf (Mag.)(ord. 270) - BV (483) MECHANICAL ENGINEERING - INGEGNERIA MECCANICA*AZZZZ091100 - INGEGNERIA DEL VENTO
051137 - WIND ENGINEERING

Programma dettagliato e risultati di apprendimento attesi

Synthesis of the subjects

The aim of the course is to provide to the student the skills to deal with the wind-structure interaction. At the beginning, the models used to define the wind characteristics will be analyzed, providing the basics of physics of the atmosphere and of statistics to describe the flow field in the natural atmospheric boundary layer. Then, the fluid-dynamic aspects induced by the presence of bodies in the flow will be investigated, defining the fundamental parameters for the bluff bodies and wing-like bodies. The common wind engineering problems will be described within the specific normative context. The fluid-structure interaction will be studied using numerical and experimental models developed for the vehicles dynamics, the sail ship dynamics, the dynamics of large structures (tall buildings, long span bridges) and wind turbines. The scaling rules and the techniques to design and perform wind tunnel tests will be also provided during the course.

 

Brief description of the subjects

Physics of the atmosphere: Phisics of the wind, macro and micro scale phenomena. Turbulence. Kolmogorov laws. Statistical properties of turbulence (turbulence intensity, length scales, spatial and time correlation). Atmospheric boundary layer. Design wind speed: standard specifications (z0, equivalent roughness). Anemometry. Numerical methods to generate time-space wind fields.

Flow-structure interaction: Wing-like bodies aerodynamics. Static loads definition. Aerodynamic coefficients. Pressure and velocity distribution in the boundary layer region. Viscosity effects. Reynolds number dependency. Bluff bodies aerodynamics; Flow separation, separation bubble and reattachments length. Wake structure. Cross wind behavior of cylinders and trains.

Wind-structure interaction: Specific wind-structure interaction problems related to the dynamics of buildings, cables, vehicles, sail-boat and wind turbines. System dynamics. Aerodynamic transfer functions (Flutter Derivatives, indicial functions, Admittance). Aerodynamic hysteresis. Dynamic instability. Buffeting response. Dimensional analysis and definition of the characteristic non dimensional parameters from the Navier Stokes equations: Reynolds number, Scrouton number, Strouhal number. Vortex shedding . Lock-in. Numerical modelling. Energy approach. Mitigation techniques for the vortex shadding from chimney/cylinders: TMD, TLCD.Normative aspects.

Wind Tunnel Tests: Force measurement techniques. Pressure field and flow field measurements. Boundary Layer production. Static models and aeroelastic models. Turbulence effects and superficial roughness effects.

Fundamentals of Numerical modelling of the fluid-structure interaction: Computational Fluid Dynamics (CFD). Finite differences/elements/volumes methods. Potential methods. Turbulence models, wall functions. Tall buildings and long span bridges aeroelasticity. Vehicle Dynamics of road/rail vehicles in cross wind conditions. Sail ship dynamics. Cable Dynamics.


Note Sulla Modalità di valutazione

Credits are obtained after passing a written and oral examination pertinent to the topics declared in the official program of the Course.


Bibliografia
Risorsa bibliografica facoltativaE. Simiu, R. H. Scanlan, Wind Effects on Structures, Editore: John Wiley & Sons
Risorsa bibliografica facoltativaCla«s Dyrbye, Svend Ole Hansen, Wind loads on structures, Editore: John Wiley & Sons

Mix Forme Didattiche
Tipo Forma Didattica Ore didattiche
lezione
30.0
esercitazione
16.0
laboratorio informatico
18.0
laboratorio sperimentale
8.0
progetto
0.0
laboratorio di progetto
0.0

Informazioni in lingua inglese a supporto dell'internazionalizzazione
Insegnamento erogato in lingua Inglese
Disponibilità di materiale didattico/slides in lingua inglese
Possibilità di sostenere l'esame in lingua inglese
Disponibilità di supporto didattico in lingua inglese
schedaincarico v. 1.6.5 / 1.6.5
Area Servizi ICT
17/05/2021