Boundary layer transition due to the entry of a small particle. - Page 137 |
Save page Remove page | Previous | 137 of 215 | Next |
|
small (250x250 max)
medium (500x500 max)
Large (1000x1000 max)
Extra Large
large ( > 500x500)
Full Resolution
All (PDF)
|
This page
All
|
region was always accompanied to its sides by low speed
streaks. This pattern of high and low speed streaks was
reminiscent of the Amini & Lespinard's 'incipient spots.'
In Figure 59 (e) , the spanwise shear was greatest at x = 23
where the high speed region was sandwiched between two low
speed streaks and were associated with the Bridge Vortices
at t = 3 9.6.
Because the Bridge Vortices interacted with the legs of
the u-shaped vortex. Figure 59(f-h) show that the
disturbance grew in the spanwise direction until it spanned
the width of the computational domain at t = 109.6. Because
periodic boundary conditions were applied at the sidewalls,
further spanwise growth was suppressed. At this point, the
disturbance could be thought of as interacting with its
images to the sides of the domain. This would limit the
spanwise movement of the Bridge Vortices and prevent further
spanwise growth of the disturbance. The leading part of the
disturbance in Figure 59 (h) was dominated by the high speed
fluid transported by the hairpin vortices in this area. At
the trailing part of the disturbance, a second high speed
region developed at the centerline in between two low speed
streaks. This was due to the Tertiary Hairpin Vortices
growing and merging into a u-shaped vortex. The streamwise
velocity contours in Figure 59(f-h) became increasingly
1 1 9
Reproduced with permission of the copyright owner. Further reproduction prohibited without permission.
Object Description
Description
| Title | Boundary layer transition due to the entry of a small particle. - Page 137 |
| Repository email | cisadmin@lib.usc.edu |
| Full text | region was always accompanied to its sides by low speed streaks. This pattern of high and low speed streaks was reminiscent of the Amini & Lespinard's 'incipient spots.' In Figure 59 (e) , the spanwise shear was greatest at x = 23 where the high speed region was sandwiched between two low speed streaks and were associated with the Bridge Vortices at t = 3 9.6. Because the Bridge Vortices interacted with the legs of the u-shaped vortex. Figure 59(f-h) show that the disturbance grew in the spanwise direction until it spanned the width of the computational domain at t = 109.6. Because periodic boundary conditions were applied at the sidewalls, further spanwise growth was suppressed. At this point, the disturbance could be thought of as interacting with its images to the sides of the domain. This would limit the spanwise movement of the Bridge Vortices and prevent further spanwise growth of the disturbance. The leading part of the disturbance in Figure 59 (h) was dominated by the high speed fluid transported by the hairpin vortices in this area. At the trailing part of the disturbance, a second high speed region developed at the centerline in between two low speed streaks. This was due to the Tertiary Hairpin Vortices growing and merging into a u-shaped vortex. The streamwise velocity contours in Figure 59(f-h) became increasingly 1 1 9 Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. |
