ETD system

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Tesi etd-03272007-112543


Thesis type
Tesi di laurea vecchio ordinamento
Author
Meldi, Marcello
email address
ramonamelkorecate@libero.it
URN
etd-03272007-112543
Title
Simulations of the flow around a circular cylinder by a continuous universal hybrid model
Struttura
INGEGNERIA
Corso di studi
INGEGNERIA AERONAUTICA
Supervisors
Relatore Salvetti, Maria Vittoria
Relatore Camarri, Simone
Parole chiave
  • hybrid
  • cylinder
  • circular
Data inizio appello
16/04/2007;
Consultabilità
Completa
Riassunto analitico
A new hybrid RANS/LES approach is presented.
The key feature of this approach is a blending between
two eddy-viscosities, one given by the k-\epsilon RANS
model and the other by the Smagorinsky VMS-LES
(variational multiscale LES) closure. The blending
is set by a parameter theta: VMS-LES mode is active when theta=0,
RANS mode if theta=1, a hybrid mode for 0<theta<1.
The hybrid model is applied to the simulation of the flow
around a circular cylinder at Re=140000, testing the sensitivity of the model to blending parameter variations, to grid refinements and to preconditioning changes.
The results are also compared with those obtained using the detached eddy simulation (DES) approach and with experimental data avaible in the literature .
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