http://swrc.ontoware.org/ontology#Article
Primary mode changes due to longitudinal wall oscillation in two-dimensional channel flow
en
跡部 隆
Atobe Takashi
日本流体力学会
Japan Society of Fluid Mechanics
Fluid Dynamics Research
46
2
2014-02-05
The stabilizing effect of longitudinal wall oscillation on two-dimensional channel flow is analytically investigated. Because the flow field has temporalperiodicity, stability can be described by the Floquet theory. To do so, a monodromy matrix is derived from a time-dependent Orr-Sommerfeld equation using the collocation method, and then stability is determined by the use of the Floquet exponents. Systems of this kind are governed by the frequency and amplitude of wall oscillation and by the Reynolds number Re, which is determined by the maximum velocity of flow and half the distance between two walls. For Reynolds numbers in the range 6000-10 000, there is a region where a stable Tollmein-Schlichting (TS) mode appears in the parameter space. When the amplitude of wall oscillation increases, the disturbance wave is generally stabilized. This effect is large, especially for the TS mode. Consequently, the primary mode of unstable disturbance is changed from the TS mode to oblique modes.
0169-5983
1873-7005
AA10686129
AA11526263
http://dx.doi.org/10.1088/0169-5983/46/2/025502|info:doi/10.1088/0169-5983/46/2/025502
(C) 2014 The Japan Society of Fluid Mechanics and IOP Publishing Ltd. Received 4 April 2013, accepted for publication 7 January 2014, published 5 February 2014.
資料番号: PA1420043000