Li-Ming Lin. Vorticity sign law in three-dimensional wake of bluff body at low Reynolds number [J]. Acta Physica Sinica, 2020, 69(3): 034701-1
- Acta Physica Sinica
- Vol. 69, Issue 3, 034701-1 (2020)
Fig. 1. Schematics of a flow past a bluff body with different geometry: (a) The straight cylinder with circular cross-section; (b) the straight cylinder with square cross-section; (c) the harmonic cylinder with circular cross-section; (d) the conic cylinder with circular cross-section; (e) the wholly wavy cylinder with square cross-section.各种几何结构形式的钝体绕流示意图 (a)圆形截面的直圆柱; (b)方形截面的直方柱; (c)圆形截面的谐波柱; (d)圆形截面的圆锥柱; (e)方形截面的全弯曲方柱
Fig. 2. At Re = 200, iso-surfaces of
in the wake of a straight circular cylinder, and contours of
on cylinder surfaces, where red and blue colors denote positive and negative values, respectively: (a) Iso-surfaces of
; (b) iso-surfaces of
; (c) iso-surfaces of
; (d) contours of
; (e) contours of
; (f) contours of
. Note that the cylinder is denoted by the grey translucent surface in iso-surfaces and the flow is from left to right.
Re = 200时直圆柱尾迹中各个涡分量等值面以及柱体表面各个涡分量等值线(其中红色和蓝色分别表示正值和负值, 注意等值面图中采用半透明灰色面来表示圆柱体, 且流动从左至右) (a)
等值面; (b)
等值面; (c)
等值面; (d)
等值线; (e)
等值线; (f)
等值线
Fig. 3. At Re = 300, iso-surfaces of
in the wake of a straight circular cylinder, and contours of
on cylinder surfaces, where red and blue colors denote positive and negative values, respectively, and green color in contours denotes
or
less than 0.001: (a) Iso-surfaces of
; (b) iso-surfaces of
; (c) iso-surfaces of
; (d) contours of
; (e) contours of
; (f) contours of
. Note that the cylinder is denoted by the grey translucent surface in iso-surfaces and the flow is from left to right.
Re = 300时直圆柱尾迹中各个涡分量等值面以及柱体表面各个涡分量等值线(其中红色和蓝色分别表示正值和负值, 以及等值线图中的绿色则表示
或
小于0.001; 注意, 等值面图中采用半透明灰色面来表示圆柱体, 且流动从左至右) (a)
等值面; (b)
等值面; (c)
等值面; (d)
等值线; (e)
等值线; (f)
等值线
Fig. 4. In the wake of a square cylinder at Re = 180: (a) Iso-surfaces of
(yellow/green) and
(red/blue), where the background is colorful contours of
at
; (b) colorful contours of
at
; (c) colorful contours of
at
. In Fig. 4 , red and blue colors, as well as solid and dashed lines in contours of
, denote positive and negative values, respectively.
Re = 180时直方柱尾迹中 (a)
(黄/绿)和
(红/蓝)等值面图, 其中背景为
处的
等值线色图; (b)
处
的等值线色图; (c)
处
的等值线色图; 图中红色和蓝色, 以及
等值线的实线和虚线分别表示正值和负值
Fig. 5. In the wake of a square cylinder at Re = 250: (a) Iso-surfaces of
(yellow/green) and
(red/blue), where the background is colorful contours of
at
; (b) colorful contours of
at
; (c) colorful contours of
at
. In Fig. 5 , red and blue colors, as well as solid and dashed lines in contours of
, denote positive and negative values, respectively.
Re = 250时直方柱尾迹中 (a)
(黄/绿)和
(红/蓝)等值面图, 其中背景为
处的
等值线色图; (b)
处
的等值线色图; (c)
处
的等值线色图, 其中红色和蓝色, 以及
等值线的实线和虚线分别表示正值和负值
Fig. 6. At Re = 100,
and
, iso-surfaces of three components of vorticity in the wake of a harmonic cylinder: (a)
; (b)
; (c)
. In Fig. 6 , red and blue colors denote positive and negative values, respectively, and the background is the colorful contour of
at
.
Re = 100,
且
时谐波柱尾迹中3个涡分量等值面图(其中红色和蓝色分别为正值和负值, 背景为
处
的等值线色图) (a)
; (b)
; (c)
Fig. 7. At Re = 100,
and
, iso-surfaces of three components of vorticity in the wake of a harmonic cylinder: (a)
; (b)
; (c)
. In Fig. 7 , red and blue colors denote positive and negative values, respectively, and the background is the colorful contour of
at
.
Re = 100,
且
时谐波柱尾迹中3个涡分量等值面图(其中红色和蓝色分别为正值和负值, 背景为
处
的等值线色图) (a)
; (b)
; (c)
Fig. 8. At Re = 100,
and
, iso-surfaces of three components of vorticity in the wake of a conic cylinder: (a)
; (b)
; (c)
. In Fig. 8 , red and blue colors denote positive and negative values, respectively, and the background is the colorful contour of
at
.
Re = 100,
且
时圆锥柱尾迹中三个涡分量等值面图(其中红色和蓝色分别为正值和负值, 背景为
处
的等值线色图) (a)
; (b)
; (c)
Fig. 9. At Re = 100,
and
, iso-surfaces of three components of vorticity in the wake of a conic cylinder: (a)
; (b)
; (c)
. In Fig. 9 , red and blue colors denote positive and negative values, respectively, and the background is the colorful contour of
at
.
Re = 100,
且
时圆锥柱尾迹中3个涡分量等值面图(其中红色和蓝色分别为正值和负值, 背景为
处
的等值线色图) (a)
; (b)
; (c)
Fig. 10. Typical distributions of surface vorticity on the wholly wavy cylinder with a square cross-section (Re = 100,
and
): (a)
; (b)
; (c)
.
典型的全弯曲方柱迎风面表面涡量分布(Re = 100,
和
) (a)
; (b)
; (c)
Fig. 11. At Re = 100,
and
, iso-surfaces of
in the wake of the wholly wavy cylinder with a square corss-section: (a)
(red/blue); (b)
(yellow/green) and
(red/blue).
Re = 100,
和
时全弯曲方柱尾迹中涡量等值面分布 (a)
(红/蓝); (b)
(黄/绿)和
(红/蓝)
Fig. 12. At Re = 100,
and
, iso-surfaces of
in the wake of the wholly wavy cylinder with a square corss-section: (a)
(red/blue) and
(yellow/green); (b)
(yellow/green) and
(red/blue).
Re = 100,
和
时全弯曲方柱尾迹中涡量等值面分布 (a)
(红/蓝)和
(黄/绿); (b)
(黄/绿)和
(红/蓝)
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Table 1.
Summary of computational domain and the nearest-wall grid used in a flow past a bluff body with different geometry.
不同几何结构的钝体绕流所采用的计算域及近壁网格尺度汇总
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