We present the results of axisymmetric and three-dimensional numerical simulations of the flow around a torus in the low Reynolds number regime [10-2; 3 à 103] and aspect-ratio 0 < Gcyrillic = 2a/R ⤠2 (core diameter over toroidal radius). It is shown that as Gcyrillic â 0, consistent with intuition and the results from the literature, the flow tends to that of a two-dimensional circular cylinder while for G â 2 the flow is that around a bluff obstacle. It has been observed that in a small region of the Re-Gcyrillic phase space, the flow develops an axisymmetric recirculation detached from the torus and with a vorticity distribution that resembles the Hill vortex. In the range 0 < Gcyrillic ⤠2, several different regimes have been observed; the peculiarities of each regime are analyzed and, whenever possible, similarities and differences with other classical flows are discussed.
Lazeroms, W., de Tullio, M.d., De Santis, N., Pizzoferrato, R., Verzicco, R. (2017). Low reynolds number flow around tori of different slenderness Î . APPLIED SCIENCES, 7(11), 1108 [10.3390/app7111108].
Low reynolds number flow around tori of different slenderness Î
Pizzoferrato, Roberto
;Verzicco, Roberto
2017-01-01
Abstract
We present the results of axisymmetric and three-dimensional numerical simulations of the flow around a torus in the low Reynolds number regime [10-2; 3 à 103] and aspect-ratio 0 < Gcyrillic = 2a/R ⤠2 (core diameter over toroidal radius). It is shown that as Gcyrillic â 0, consistent with intuition and the results from the literature, the flow tends to that of a two-dimensional circular cylinder while for G â 2 the flow is that around a bluff obstacle. It has been observed that in a small region of the Re-Gcyrillic phase space, the flow develops an axisymmetric recirculation detached from the torus and with a vorticity distribution that resembles the Hill vortex. In the range 0 < Gcyrillic ⤠2, several different regimes have been observed; the peculiarities of each regime are analyzed and, whenever possible, similarities and differences with other classical flows are discussed.File | Dimensione | Formato | |
---|---|---|---|
2017 Appl Sci Verzicco et al.pdf
accesso aperto
Descrizione: Articolo principale
Licenza:
Non specificato
Dimensione
3.97 MB
Formato
Adobe PDF
|
3.97 MB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.