著者

能登 勝久 矢場田 真 中島 健

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. B編 (ISSN:03875016)

巻号頁・発行日

vol.64, no.623, pp.2311-2318, 1998-07-25

被引用文献数

6

---

The cause and effect of fluid type on thermo-fluid pattern of the suppression of the isothermal Karman vortex street to a modified vortex street and a plume-like flow due to positive buoyancy in a circular cylinder wake with an upward freestream of mercury, air and water are made clear by solving numerically of the two-dimensional, laminar, time-dependent continuity equation, Navier-Stokes equations with the buoyancy term, and energy equation. For any type of fluid, the cause of the suppression is an extinction of wake vorticity ; shear layers increases and the wake vorticity decreases due to positive buoyancy. Behavior of the suppression is different each other in mercury, air and water, beacuse an increase of the wall vorticity and a decrease of the wake vorticity are different in those fluid.