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Date of Publication:2022-10-10

Journal:船舶力学

Volume:21

Issue:10

Page Number:1181-1189

ISSN No.:1007-7294

Abstract:Based on the characteristic of two circular cylinders in tandem, the numerical computation model under high Reynolds number was established with the characteristics that IVCBC vortex method suits for computing under high Reynolds number. The convergence of IVCBC vortex method was validated by the classical cases. Wake characteristics of double circular cylinders were investingated under Reynolds num-ber 2.5×104 and gap ratios 1.1, 1.25, 2, 2.5, 3, 3.25 and 4. Generation, split and merger of small vortex in wake were shown clearly. The reason of wake mutation and characteristics of flow around two circular cylin-ders in tandem was explained detailedly. The study shows that wake models are in good agreement with that of classical experimental model, and the vortex pair between two cylinders is the main reason of wake mu-taion. At small gap ratios, formation of the small vortex on top of gap and the vibration of flow inside gap is cynchronization with shedding of vortex on the surface of downstream cylinder. It is large advantages of the simulation model compared with the grid methods because the simulation model can show the small vortex in wake. It provides an important tool to study further the characteristics of flow force of double cylin-ders in tandem.

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