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Showing 1 to 20 of 291 for “"Boundary layers"”.
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Dissipation in Skewed Boundary Layers
… generation within a turbulent, collateral boundary layer is well understood and is characterised by a dissipation coefficient, Cd . However, it is common for the transverse pressure gradients in turbomachines to create highly skewed boundary layers, where the velocity varies in direction as …
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Unsteady boundary layers and separation
The characteristic properties of boundary layer and separation in unsteady flow, play a very important role in fluid and structural mechanics because of their drastic effect on control forces generated by aerodynamic surfaces and loads carried by aerodynamic structures. Prandtl's criterion for …
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Secondary instabilities of boundary layers
Several aspects of the subharmonic instability of boundary layers are studied. First, the subharmonic instability of incompressible flows over a flat plate is investigated using the resonant triad model and the Floquet model. The primary wave is taken in the form of a two-dimensional (2-0) …
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Stability of heated boundary layers
… analysis is presented for two-dimensional boundary layer flows. The method of multiple scales is used to derive the amplitude and the wave number modulation equations, which take into account the nonparallelism of the basic flow. The zeroth-order eigenvalue problem is numerically integrated …
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Multi-Row Film Cooling Boundary Layers
… of discrete holes into a flat plate turbulent boundary layer. Adiabatic effectiveness distributions are measured for several multi-row film cooling geometries. The geometries are designed with two different hole spacings and two different hole types to yield four total geometries. One of the …
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Turbulent wave-current boundary layers revisited
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2001.
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Sound from Rough Wall Boundary Layers
… ranging from 24 to 197 and roughness height to boundary layer thickness ratios of 5 to 18. Their theory is shown to work very accurately to predict the noise from surfaces with large roughness Reynolds numbers, but for cases with highly inhomogeneous wall pressure fields, differences grow …
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On subharmonic instability in boundary layers
The subharmonic instability in two-dimensional boundary layer on a flat plate is analyzed using the parametric instability model and the resonant triad model. The problems arising from both models are solved numerically using the shooting technique and results are presented. It is found that in the …
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Unsteady Heat Transfer in Laminar Boundary Layers
Made available in DSpace on 2014-12-09T17:13:35Z (GMT). No. of bitstreams: 1 6511802.pdf: 4644399 bytes, checksum: 714b0516990fb3546d226e64b060a46c (MD5) Previous issue date: 1965
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Wave interactions in three-dimensional boundary layers
… process in three-dimensional boundary layers are investigated. Resonant triad interactions are studied in the boundary layer on the leading edge of a swept wing under typical commercial jet cruise conditions. Both compressible and incompressible models are developed using the …
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Integral methods for three-dimensional boundary layers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1998.
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Some unsteady features of turbulent boundary layers
… zero and favorable pressure gradient turbulent boundary layers, the unsteadiness in the form of turbulent fluctuations was investigated. Phase ensemble-averaged flow characteristics of a large amplitude periodic unsteady turbulent boundary layer was also investigated at a reduced frequency k = …
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Compressible flows of dense gases in boundary layers
… numerics necessary for the analysis of dense-gas boundary-layer flows over arbitrarily shaped two-dimensional bodies are developed. The governing equations are derived from the Navier-Stokes-Fourier equations for a general fluid. A numerical method based on the second-order Davis-coupled scheme is …
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Modeling of Compressibility Effects in Turbulent Boundary Layers
… much influence on the dynamics of the supersonic boundary layer; the fluctuating thermal component was studied as the only source of compressibility effects in the boundary layer. An approach to the study of thermal compressibility effects and a possible way to draw a parallel between …
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Free-Convection Heat Transfer in Laminar Boundary-Layers
Made available in DSpace on 2014-12-10T22:48:25Z (GMT). No. of bitstreams: 1 7500356.pdf: 7490531 bytes, checksum: 4ab7702e395b9c4bbd758519d04ca551 (MD5) Previous issue date: 1974
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The prediction of transition region in boundary layers
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1985.
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Velocity and temperature fields in oscillating boundary layers
The response of boundary layer velocity and temperature distributions to small amplitude oscillations imposed by the free-stream is investigated. A straightforward combination of perturbation and numerical methods is applied. The analysis of the effect of the frequency of oscillations shows that in …
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