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Scheda Riassuntiva
Anno Accademico 2013/2014
Tipo incarico Dottorato
Insegnamento 095289 - ATMOSPHERIC BOUNDARY LAYER: FUNDAMENTAL PHYSICS AND MODELING
Docente Gorle Catherine
Cfu 5.00 Tipo insegnamento Monodisciplinare

Corso di Dottorato Da (compreso) A (escluso) Insegnamento
MI (1383) - INGEGNERIA MECCANICA / MECHANICAL ENGINEERINGAZZZZ095289 - ATMOSPHERIC BOUNDARY LAYER: FUNDAMENTAL PHYSICS AND MODELING

Programma dettagliato e risultati di apprendimento attesi

SUMMARY
The aim of the course is to first review the fundamental physics of the atmospheric boundary layer and subsequently focus on modeling of a neutral atmospheric boundary layer using wind tunnel and computational methods. Finally, different applications and the challenges related to the inherent variability of the atmospheric boundary layer will be discussed. The course will consist of lectures, practice sessions, and experimental and computational lab sessions to provide hands on experience in measuring and modeling the atmospheric boundary layer.

 

DETAILED PROGRAM


Introduction to the ABL

  • Motivation and definition
  • Wind & Flow: mean wind, turbulence, waves
  • Turbulent transport & Taylor’s hypothesis
  • Buoyancy & Virtual Potential Temperature
  • ABL depth & structure
  • Micrometeorology

Governing Equations

  • Full equations:
     Equation of state
     Conservation of Mass
     Conservation of Momentum
     Conservation of Heat
     Conservation of Scalar
  • Simplifications, approximations & scaling arguments
  • Equations for mean variables (Reynolds-averaging):
     Equation of state
     Conservation of Mass
     Conservation of Momentum
     Conservation of Heat
     Conservation of Scalar
  • Case studies

Turbulence Kinetic Energy

  • Definition of TKE
  • TKE budget
  • Contributions to TKE budget
  • TKE budget as function of eddy size
  • Mean kinetic energy and interaction with turbulence

Stability and Similarity

  • Stability:
     Static
     Dynamic
  • Richardson number & stability tables
  • Obukhov length
  • Similarity Theory

Analysis of boundary layer turbulence

  • Time series and spectral gap
  • Mean
  • Variance & Turbulence Intensity
  • Vorticity, skewness, kurtosis
  • Covariance and correlation
  • Auto-correlation
  • DFT, FFT
  • Energy spectrum
  • Spectral characteristics
  • Spectral decomposition of the TKE equation (integral scales)

ABL Measurements

  • Introduction field vs laboratory measurements
  • Field measurements:
     Sensors
     Platforms
     Examples, challenges and limitations
  • Wind tunnel measurements:
     Introduction to ABL wind tunnels
     Sensors & measurement systems
     Introduction to experimental lab session
  • Wind tunnel ABL modeling:
     Techniques for producing a fully-developed ABL (focus on passive devices)
     Simplified theory
     Reference to active devices and stable ABL modeling
  • Challenges and limitations

Introduction to computational approaches

  • Overview of available modeling techniques

CFD modeling

  • DNS
  • LES
  • RANS
  • Turbulence models
  • Mixing models

Simulation of turbulent wind fields for engineering applications

  • Stationary and nonstationary wind phenomena
  • One-point statistical description of turbulence
  • Two(Multi)-point statistical description of turbulence
  • Numerical methods for the simulation of turbulent wind fields
     ARMA
     Wave superposition
     Advanced numerical methods: POD, hybrid
  • Application on long span bridge

Applications

  • Wind climate
  • Dispersion
  • Wind energy
  • Wind Loading
  • Sensitivity & Uncertainty Quantification

Note Sulla Modalità di valutazione

The assessment will be based on:

  • a written test for the first part of the course
  • a report on the wind tunnel lab and corresponding CFD simulations
  • a report on a computational assignment

Intervallo di svolgimento dell'attività didattica
Data inizio
Data termine

Calendario testuale dell'attività didattica
 

Bibliografia

Mix Forme Didattiche
Tipo Forma Didattica Ore didattiche
lezione
32.0
esercitazione
12.0
laboratorio informatico
12.0
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

Note Docente
Dates: 5-16 May 2014. Detailed information: https://beep.metid.polimi.it/web/2013-14-atmospheric-boundary-layer-fundamental-physics-and-modeling-catherine-gorle-/informazioni-sul-corso-e-docenti
schedaincarico v. 1.6.1 / 1.6.1
Area Servizi ICT
17/10/2019