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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
Commissione
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.<br>The key feature of this approach is a blending between<br>two eddy-viscosities, one given by the k-\epsilon RANS<br>model and the other by the Smagorinsky VMS-LES<br>(variational multiscale LES) closure. The blending<br>is set by a parameter theta: VMS-LES mode is active when theta=0,<br>RANS mode if theta=1, a hybrid mode for 0&lt;theta&lt;1.<br>The hybrid model is applied to the simulation of the flow<br>around a circular cylinder at Re=140000, testing the sensitivity of the model to blending parameter variations, to grid refinements and to preconditioning changes.<br>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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