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Stability of supersonic boundary layer on permeable surface

Gaponov S. A., Ermolaev Yu. G., Kosinov A. D., Lysenko V. I., Semionov N. V., Smorodsky B. V.

Archives of Mechanics

2014

Vol. 66, nr 6

453--466

In the present study we have performed combined theoretical and experimental investigation of the surface permeability influence on the linear stability of the supersonic flat-plate boundary layer at free-stream Mach number M = 2. Good quantitative agreement was obtained between the data calculated by the linear theory of stability and the data obtained in experiments with artificially generated disturbances performed on models with various porous inserts.

Destabilization of a laminar flow in a rectangular channel by transversely-oriented wall corrugation

Szumbarski J., Błoński S.

Archives of Mechanics

2011

Vol. 63, nr 4

393-428

Linear stability of the flow through the transversely corrugated channel with flat sidewalls is investigated numerically. Two variants of the wall corrugation are considered: symmetric sinusoidal waviness of the top and bottom walls and onesided corrugation, i.e., one of the walls remains flat. Spectrally accurate Galerkin method formulated in a transformed domain is used for the solution of the main flow and linear stability equations. Unstable normal modes have been identified and their parametric variation has been determined. The results show that for sufficiently large aspect ratios, the influence of the sidewalls is weak and the stability properties resemble those of the spanwise-periodic channel (investigated recently by the first author). It means that an appropriately designed transversal corrugation may be regarded as a promising method for passive enhancement of mixing in laminar regime.

Suction through point-like opening and stability of boundary layer

Popov I. Yu

Archives of Mechanics

2001

Vol. 53, nr 3

205-218

A model of boundary layer suction through small opening is suggested. A procedure of neutral curve construction is described. The dependence of the shift of neutral curves on the intensity of suction and on the position of the opening is studied.