| 1. |
- Eliasson, V, et al.
(författare)
-
Shaping converging shock waves by means of obstacles
- 2006
-
Ingår i: Journal of Visualization. - KTH Mech, SE-10044 Stockholm, Sweden. : SPRINGER. - 1343-8875 .- 1875-8975. ; 9:3, s. 240-240
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
|
|
| 2. |
- Chernoray, Valery, 1975, et al.
(författare)
-
Influence of an unfavourable pressure gradient on the breakdown of boundary layer streaks
- 2007
-
Ingår i: Journal of Visualization. - 1343-8875 .- 1386-6478. ; 10:2, s. 217-225
-
Tidskriftsartikel (refereegranskat)abstract
- Breakdown of boundary layer streaks is studied experimentally and compared at zero and adverse (positive) streamwise pressure gradients on a wing under fully controlled experimental conditions. The varicose mode of streak breakdown is found to be a dominant mode in the case of the adverse pressure gradient. A strong influence of pressure gradient upon the development of the streak and the secondary instability is revealed. The unfavourable pressure gradient is shown to alter the critical streak amplitude, the dispersion properties of the streak and the secondary disturbance, as well as attained maximum amplitudes for both the streak and the secondary disturbance.
|
|
| 3. |
- Chernoray, Valery, 1975, et al.
(författare)
-
Visualization of sinusoidal and varicose instabilities of streaks in a boundary layer
- 2006
-
Ingår i: Journal of Visualization. - 1343-8875 .- 1386-6478. ; 9:4
-
Tidskriftsartikel (refereegranskat)abstract
- Nonlinear instabilities of boundary layer streaks are investigated experimentally. Extensive measurements visualizing the sinusoidal and varicose instabilities of streaky structures at nonlinear stage of the breakdown process in boundary layer are presented. The flow behaviour in the course of spatial evolution of the streaky structures with a secondary high-frequency disturbance generated on them is discussed. Various scenarios of origination and development of coherent vortex structures examined in physical experiments are considered. Specific features of the development of sinusoidal and varicose cases of destruction of the steady streamwise streaks are demonstrated, such as transverse and streamwise modulations of the streak by the secondary-disturbance frequency, appearance of new streaky structures in the downstream direction, and emergence and evolution of unsteady Λ-shaped structures localized in space in both cases.
|
|
