International Journal of coastal and offshore engineering
نشریه بین المللی مهندسی ساحلی و فراساحلی
ijcoe
Engineering & Technology
http://ijcoe.org
1
admin
2538-2667
2588-3186
10.29252/ijcoe
en
jalali
1396
12
1
gregorian
2018
3
1
1
4
online
1
fulltext
en
Study of Flow Characteristics around a Near-Wall Circular Cylinder Subjected to a Steady Cross-Flow
Marine Hydrodynamics
پژوهشي
Research
Three-dimensional RANS simulations are employed numerically to study flow characteristics around a near-wall circular cylinder for varying gap-to-diameter (G/D) ratios (Where G is the gap between the cylinder and the wall and D is the cylinder diameter) and at Reynolds numbers from 100 to 3900. Pressure distribution around the circular cylinder, base pressure magnitude, separation and stagnation angles, force coefficients and Strouhal numbers were calculated and compared for all of the cases. Inception of vortex shedding can be seen when a sudden decrease in the maximum of positive pressure coefficient occurs. Vortex shedding mechanism and possibility of suppression further investigated via comparison of swirling strength in upper and lower vortex regions through parameter Λ, which signifies vortical activity and balance with respect to the wake center-line and also the flow type parameter, λ, representing the extensional strain dominance in the wake flow and gap flow. Vortex shedding suppression observed for the cases with the high unbalance vorticity content in the vortex regions, namely for Λ ≥ 2.
pressure distribution, force coefficients, separation angle, stagnation angle, vortex shedding suppression
45
55
http://ijcoe.org/browse.php?a_code=A-10-183-1&slc_lang=en&sid=1
Mohammad Amin
Salehi
mascivil9@gmail.com
`1003194753284600370`

1003194753284600370
Yes
student
Said
Mazaheri
said.mazaheri@inio.ac.ir
`1003194753284600371`

1003194753284600371
No
assistant professor
Mohammad Hossein
Kazeminezhad
mkazeminezhad@inio.ac.ir
`1003194753284600372`

1003194753284600372
No
assistant professor