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Tesi etd-09102013-162817


Tipo di tesi
Tesi di laurea magistrale
Autore
ALESSI, GIACOMO
URN
etd-09102013-162817
Titolo
NUMERICAL SIMULATION OF THE BENJAMIN BUBBLE DYNAMICS BY MEANS OF OPENFOAM
Struttura
INGEGNERIA CIVILE E INDUSTRIALE
Corso di studi
INGEGNERIA AEROSPAZIALE
Commissione
relatore Prof. Salvetti, Maria Vittoria
relatore Dott. Camarri, Simone
relatore Ing. Mariotti, Alessandro
Parole chiave
  • open-source CFD code
  • multiphase flow
  • slug flow
  • high-viscosity fluids
  • Benjamin bubble
Data inizio appello
08/10/2013;
Disponibilità
completa
Riassunto analitico
In this work the capabilities of an open-source CFD code (OpenFOAM) in the simulation of the Benjamin bubble are benchmarked against the available experimental data, theoretical analysis and numerical results of simulations carried out with a commercial code. The simulations are carried out for a large range of Reynolds numbers, obtained by using both water and high-viscosity oils. The volume of fluid (VOF) multiphase model is used in the simulation. The dynamics of the Benjamin bubble is investigated in terms of bubble drift velocity and shape. The sensitivity of the results to the size of the time step, to the numerical discretization schemes and to grid refinement and topology is investigated by using water as working liquid. It is found that the most critical parameters are grid topology and resolution. The results obtained on a structured hexaedral grid of adequate resolution show good agreement with experimental data both in terms of bubble shape and drift velocity. In particular, the bubble shape obtained with OpenFOAM is closer to the experimental one than that found in analogous simulations carried out with a commercial code.
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