Numerical Investigation of Pressure Gradient Effect on Wall-pressure Fluctuations
Title | Numerical Investigation of Pressure Gradient Effect on Wall-pressure Fluctuations PDF eBook |
Author | Kok Chian Ng |
Publisher | |
Pages | 50 |
Release | 2013 |
Genre | Electronic dissertations |
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This research investigates the effect of pressure gradient on wall-pressure fluctuations in turbulent boundary layers using a delayed detached eddy simulation (DDES) turbulence scheme. The results are compared to Goody's and Efimtsov's empirical single-point wall-pressure spectrum models. Three different types of pressure gradient conditions were investigated numerically: zero pressure gradient (Flat Plate as a baseline model), favorable pressure gradient (Convex 10, 20, and 40 Plates), and adverse pressure gradient (Concave 10, 20, and 40 Plates). The numerical results were subsequently compared with each other. For the zero pressure gradient case, results compared well with empirical solutions. It was observed that, for cases with adverse pressure gradients, the pressure fluctuations were more chaotic than for the favorable pressure gradient models. In contrast, the favorable pressure gradient models induced lower frequency noise relative to adverse pressure gradient models.
Wall-pressure Fluctuations and Pressure-velocity Correlations in a Turbulent Boundary Layer
Title | Wall-pressure Fluctuations and Pressure-velocity Correlations in a Turbulent Boundary Layer PDF eBook |
Author | John S. Serafini |
Publisher | |
Pages | 88 |
Release | 1963 |
Genre | Fluid dynamics |
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This experimental study was carried out at a free-stream Mach number of 0.6 and a Reynolds number per foot of 3.45 x 106. The magnitudes of the wall-pressure fluctuations agree with the Lilley-Hodgson theoretical results. Space-time correlations of the wall-pressure fluctuations generally agree with Willmarth's results for longitudinal separation distances. The convection velocity of the fluctuations is found to increase with increasing separation distances, and its significance is explained. Measurements with the longitudinal component of the velocity fluctuations indicate that the contributions to the wall-pressure fluctuations are from two regions, an inner region near the wall and an outer region linked with the intermittency.
Investigation of Wall Pressure Fluctuations Induced by Turbulent Boundary Layer Flow with Pressure Gradients
Title | Investigation of Wall Pressure Fluctuations Induced by Turbulent Boundary Layer Flow with Pressure Gradients PDF eBook |
Author | Nan Hu |
Publisher | |
Pages | |
Release | 2018 |
Genre | |
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Scientific and Technical Aerospace Reports
Title | Scientific and Technical Aerospace Reports PDF eBook |
Author | |
Publisher | |
Pages | 704 |
Release | 1995 |
Genre | Aeronautics |
ISBN |
Pressure Fluctuations in Turbulent Boundary Layers
Title | Pressure Fluctuations in Turbulent Boundary Layers PDF eBook |
Author | M. V. Lowson |
Publisher | |
Pages | 36 |
Release | 1965 |
Genre | Atmospheric pressure |
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Applied Mechanics Reviews
Title | Applied Mechanics Reviews PDF eBook |
Author | |
Publisher | |
Pages | 542 |
Release | 1972 |
Genre | Mechanics, Applied |
ISBN |
A Numerical Investigation of Instability and Transition in Adverse Pressure Gradient Boundary Layers
Title | A Numerical Investigation of Instability and Transition in Adverse Pressure Gradient Boundary Layers PDF eBook |
Author | |
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Pages | |
Release | 1997 |
Genre | |
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