Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 1030 for “"unsteady"”.
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Unsteady Turbulent Thermal Convection
Made available in DSpace on 2014-12-13T19:55:28Z (GMT). No. of bitstreams: 1 7913452.pdf: 6971677 bytes, checksum: aee66dfa593fbae28d95ce38bdda394c (MD5) Previous issue date: 1978
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Unsteady aerodynamics of falling plates
We investigate the problem of falling paper by solving the two dimensional Navier-Stokes equations subject to the motion of a free falling body at Reynolds numbers around 10^3, which is typical for a leaf or business card falling in air, and experimentally, by using a quasi two dimensional set up …
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Unsteady Flow in Sewer Networks
Made available in DSpace on 2014-12-10T22:22:08Z (GMT). No. of bitstreams: 1 7412182.pdf: 4976989 bytes, checksum: 3c6c8b8b8f296a7ba579a5576941a99c (MD5) Previous issue date: 1973
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Marine propellers in unsteady flow
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1989.
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Unsteady boundary layers and separation
… 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 separation has been …
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Steady and unsteady cascade measurements
… made for extension of this model to predict the unsteady flow in a cascade.
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Unsteady aerodynamics using high-order methods
Unsteady flows occur in many applications of engineering interest. One category of unsteady flows occur as self-sustaining oscillatory fluid motion, such as the flow over rectangular cavities. There has been a significant amount of research performed on this topic over the years, both …
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Studies in Unsteady Penetrative Thermal Convection
This study concentrates on the dynamics and structure of turbulence in the interfacial region and the upper part of a mixed layer which is capped by a linearly stratified, non-turbulent region. Measurements of the local, instantaneous values of the temperature, the vertical velocity and horizontal …
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Unsteady Aerodynamics of Compact Axial Compressors
… variations affect the three-dimensional and unsteady flow field in a compact axial compressor both pre-stall and in stall. An experimental study has been conducted using a scaled-up single-stage axial compressor across a Reynolds number range of 10⁴ to 10⁵. Steady and unsteady casing static …
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The Unsteady Topology of Corner Separations
… Surprisingly, little is understood about the unsteady topology of these separations. One of the problems with studying corner separations is that it is often difficult to understand whether a particular flow structure in the separation is inherent to the separation itself, or due to the …
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Unsteady Aerodynamics of Wing-Gust Encounters
Wind gusts can be highly detrimental to the performance of fixed wing aircraft. At low flight speeds, gusts transverse to the lifting surfaces can cause massive changes to the angle of incidence, fluctuations in lift and drag, and result in flight instability. This may be catastrophic for small …
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Mathematical modelling of unsteady contact melting
… flow problem encountered in the analysis of an unsteady contact melting process. Chapters 2 and 3 deal with only the heat transfer problem without fluid flow. In Chapter 2 the pre-melting problem is treated. The focus is to obtain the best approximate analytical solution to be used in the …
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Periodic propeller forces in unsteady flow
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Naval Architecture and Marine Engineering, 1964.
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Unsteady Aerodynamics of Deformable Thin Airfoils
Unsteady aerodynamic theories are essential in the analysis of bird and insect flight. The study of these types of locomotion is vital in the development of flapping wing aircraft. This paper uses potential flow aerodynamics to extend the unsteady aerodynamic theory of Theodorsen and Garrick (which …
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Unsteady Nonlinear Aerodynamic Modeling and Applications
Unsteady aerodynamic modeling is indispensable in the design process of rotary air vehicles, flapping flight and agile unmanned aerial vehicles. Undesirable vibrations can cause high-frequency variations in motion variables whose effects cannot be well predicted using quasi-steady aerodynamics. …
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Evaluation of Turbulence Models for Unsteady Separation
Unsteady separation occurs in many physical flows due to time-varying adverse pressure gradients. This phenomenon may result in increased drag, decreased lift, and loss of efficiency or failure in flow devices. It is, therefore, important to predict and analyze unsteady separation in the design of …
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Unsteady Internal Ballistics of a Hybrid Rocket
… a hybrid rocket motor involves several coupled unsteady phenomena like moving walls, combustion in a boundary layer flow and mass addition along the port, through the regression of the solid fuel wall. The flow in the combustion chamber of a hybrid rocket is inherently unsteady because the …
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