13 Result(s)
within
M. R. Malik
Classical Mechanics
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Chapter and Conference Paper
Nonlinear Crossflow Disturbances and Secondary Instabilities in Swept-Wing Boundary Layers
We numerically solve the governing partial differential equations to study nonlinear evolution of crossflow disturbances in incompressible as well as compressible boundary layers. When the amplitude of these d...
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Chapter
A Generalized Method for the Stability of Incompressible Attachment-Line Flow
The stability of small disturbances in the incompressible swept attachment-line boundary-layer flow is determined by solving the partial-differential eigenvalue problem. Previous theoretical investigations con...
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Chapter
Secondary Instability of Görtler Vortices
Secondary instability of stationary Görtler vortices is studied by using a 2D eigenvalue approach and parabolized stability equations. The Görtler vortex is found to be subject to two types of secondary modes:...
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Chapter
Effect of Crossflow on Görtler Instability
In this paper, some results on the effect of cross flow on Görtler instability in incompressible boundary layers are presented. The results cover a wide range of sweep angles, pressure gradient, and wall curva...
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Chapter
Effect of Mach Number on Instability Waves Generated from a Localized Disturbance
The disturbance wave pattern produced from a harmonic point source in a compressible flat-plate boundary layer is computed using non-parallel linear stability theory and direct numerical integration approach. ...
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Chapter and Conference Paper
Oblique Mode Breakdown in a Supersonic Boundary Layer Using Nonlinear PSE
Nonlinear, compressible parabolized stability equations (PSE) are used to study the transition process in a Mach 1.6 flat plate boundary layer. It is shown that two oblique first-mode waves interacting among t...
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Chapter and Conference Paper
Nonparallel Stability of Rotating Disk Flow Using PSE
We use linear, parabolized stability equations (PSE) to study nonparallel stability of rotating disk flow. We find the nonparallel effect to be small when compared to the quasi-parallel theory of Malik, Wilkin...
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Chapter and Conference Paper
Discrete Modes and Continuous Spectra in a Mach 2 Boundary Layer
The disturbance field (discrete modes and continuous spectra) induced due to a harmonic point source in a Mach 2 boundary layer is studied by using generalized Fourier transform techniques. The results show th...
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Chapter and Conference Paper
Transition Research in Low-Disturbance High-Speed Wind Tunnels
The technical requirements and test data from the Mach 3.5 Pilot Low-Disturbance Tunnel are presented. This unique facility provides a test region with essentially zero-acoustic noise and simulates, for the fi...
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Chapter and Conference Paper
Effect of Wall Suction and Cooling on the Second Mode Instability
Compressible linear viscous stability theory is used to study the effect of combined wall suction and cooling on the second mode instability in a flat plate boundary layer. While wall cooling destabilizes the ...
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Chapter and Conference Paper
Transition Prediction in External Flows via Linear Stability Theory
Paper summarizes progress in relating linear stability theory to transition location. Linear stability theory computations for both flight and low-disturbance wind tunnels, at low and high speeds, and for T-S,...
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Chapter and Conference Paper
Effects of Nozzle Design Parameters on the Extent of Quiet Test Flow at Mach 3.5
To advance boundary-layer stability and transition research and to ultimately provide reliable predictions of transition for supersonic flight vehicles, a wind tunnel is required with much lower stream disturb...
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Chapter and Conference Paper
Effect of Curvature on Cross-Flow Instability
The problem of the stability of a three-dimensional laminar boundary layer formed on a curved surface is considered. A calculation scheme, which takes account of the curvature of the flow streamlines and of th...
