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Showing 1 to 16 of 16 for “"Vortical Flows"”.
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Vortical flows in an adverse pressure gradient
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1993.
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A coupled Eulerian/Lagrangian method for the solution of three-dimensional vortical flows
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
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Numerical investigations of vortex dynamics: bursting, twist waves, and sensitivity analysis
Vortical structures are ubiquitous in real-world fluid flows, from the vortices generated by swimming fish to the wakes of aircraft and propellers. They form the backbone of high Reynolds number turbulent flows. Their dynamics are governed by non-linear processes, leading to a range of vortical …
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Numerical Analysis of Gun Barrel Pressure Blast Using Dynamic Mesh Adaption
… flow features such as shock waves, blast waves, vortical flows, etc. which are generated in launching a projectile up to supersonic speed. The projectile mass and the initial conditions behind the projectile for inviscid cases have been varied to investigate its effect on the flow field and were …
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Effects of Turbulence Modeling on RANS Simulations of Tip Vortices
… modeling on the resolution of free shear vortical flows. The simulation of aerodynamic wing-tip vortices is used as a test bed. The primary configuration is flow over an isolated finite wing with aspect ratio, , and Reynolds number, . Tip-vortex velocity profiles, vortex core and wake …
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The aerodynamics of multi-element wings in ground effect
… surface flow field and characteristics of the vortical flows. The computational aspect of the research also offered improvements over the current knowledge. Accurate predictions of a single element aerofoil, multi-element aerofoil and multi-element wing were obtained quantifying the effects of …
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Towards Improvement of Numerical Accuracy for Unstructured Grid Flow Solver
… schemes have been tested for a wide range of flows from very low Mach number to supersonic speeds. The observed accuracy for the improved schemes is verified using a benchmark case about an inviscid vortex transporting in a free stream flow. In addition, the ability to capture the tip trailing …
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Well balanced Arbitrary-Lagrangian-Eulerian Finite Volume schemes on moving nonconforming meshes for non-conservative Hyperbolic systems
… the typical mesh distortion caused by shear flows in Lagrangian-type methods, we adopt a nonconforming treatment of sliding interfaces, which requires the dynamical insertion or deletion of nodes and edges, and produces hanging nodes and space-time faces shared between more than two cells. In …
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Sensing and control for fishlike propulsion in unsteady environments
… propulsion and to achieve energy recovery from vortical flows. This is a capability that is not available to engineered underwater systems today. A paradigm example lies in the ability of fish to save energy when swimming in schools, through extracting energy from vortices generated by other …
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Automatic Cell Tracking For Studying Large Epithelial Sheets Of Cells And Its Application To Chicken Gastrulation
… streak that is characterised by large scale vortical flows that involve an order of >200,000 cells. During this self-organised process individual epithelial cells are migrating in a highly coordinated manner. The cell behaviours driving the flows and migration are unknown due to the lack of …
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Effect of Endwall Fluid Injection on Passage Vortex formation in a First Stage Nozzle Guide Vane Passage
… in the leading edge-endwall junction where vortical flows cause the flow of hotter fluid in the mainstream to mix with relatively lower temperature boundary layer fluid. This work documents the computational investigation of air injection at the end wall through a cylindrical hole placed …
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Separated Flows Over Non-slender Delta Wings
Wings with sweep are ubiquitous for engineering applications, and are observed in biology for swimmers and fliers alike. In particular, delta wings have wide ranging applicability arising from their low speed maneuvering characteristics, and favourable properties approaching the speed of sound. …
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Contributions to the Understanding of Ship Airwakes Using Advanced Flow Diagnostic Techniques
… complex, three dimensional, unsteady aerodynamic flows produced by the superstructure of a ship, which is referred to as an airwake. This problem is relevant and important because the turbulent airwake significantly and adversely affects the ability for rotorcraft to operate safely from the decks …
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Rotor Wakes; Formations, Interactions, and Design
… outside the core region. This entails that the vortical flows produced by these propulsive devices cannot be adequately modeled as a concentrated vortex due to the lack of significant induction effect outside the propulsive streamtube. Integrating the propulsive wake into an aero-propulsive 3D …
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Flows inside cells: From natural cytoplasmic streaming to microfluidic systems
… processes. In this thesis, we discuss fluid flows inside cells, from naturally occurring cytoplasmic streaming to experimental techniques for inducing cytoplasmic flows and controlling micron-sized particles. First, we consider cytoplasmic streaming observed during cell division, specifically …