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 37 for “"Inviscid flow"”.
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Inviscid flow from a slot into a cross stream
… thesis describes a new method for predicting inviscid non-isoenergetic flow from an arbitrarily inclined slot into a uniform free stream. In the absence of flow separation the solution depends on three parameters: [i] the slot angle 13, [ii] a parameter, Cpt, describing the difference in total …
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Jet Fluid Mixing Control Through Manipulation Jet Fluid Mixing Control Through Manipulation of Inviscid Flow Structures
… industrial and propulsion devices involving jet flows. In this dissertation, two methodologies, self-excited nozzles and radially lobed nozzles, are studied and presented in order to enhance mixing in the near field of coflowing, subsonic, turbulent, free jet flows. The characteristics of the …
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An analysis method for the viscous/inviscid flow around two dimensional multi-element aerofoils including surface roughness effects
… numerical solution of the incompressible, steady flow around two dimensional multi-element aerofoils having a rough or smooth surface.The potential flow over the aerofoil is solved by replacing the aerofoil contour with a polygon of plane panels and using linear distributed vorticity on the panels …
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Design of a Low Reynolds Number Propulsion System for an Autonomous Underwater Vehicle
… the viscous effects of low Reynolds number flow that is experienced by small, slow turning propellers. The methodology consists of determining the minimum induced loss lift distribution for the propeller via lifting line theory, efficient airfoil sections for the propeller via a coupled …
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Numerical Solutions for Two- and Three-Dimensional Non-Reacting Flowfields in an Internal Combustion Engine
The numerical solution for the flowfield established in a spark- ignition internal combustion engine during the four-stroke (intake, compression, power, exhaust) cycle is considered. Only fluid-dynamic effects are treated with combustion simulated by constant- volume heat addition near …
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Boundary layer flows over sharp and spherically blunted cones at angle of attack to supersonic nonuniform free streams
… from method of characteristics solutions of the inviscid flow field. A modified inverse method for solving the inviscid flow field is used to provide edge properties for the axisymmetric region of blunt cones. Results obtained for blunt cones in uniform flow are compared to experimental data …
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Calculation of the flow over a stalled airfoil
… calculating the steady, incompressible, viscous flow over an airfoil, including regions of separated flow, is presented. The finite-difference equations resulting from an integral method for the laminar and turbulent boundary layers are solved simultaneously in a line-relaxation procedure with …
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Numerical investigation of subsonic flow over bodies of revolution and a typical missile forebody
… of this investigation to study the subsonic flow over a missile forebody. To this end, the NASA Ames developed OVERFLOW, three dimensional, Navier-Stokes Code was applied and detailed results were obtained for the missile forebody. The flow conditions were set at a Mach Number of 0.3 and …
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Separation and wakes over three-dimensional bodies
The laminar flow over a prolate spheroid was investigated via flow visualization and Laser-Doppler Velocimetry. Experiments were conducted in a water tunnel and the flow was visualized with dyes. The measurement of three-dimensional boundary layers required a special design of the laser optics. …
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An analytical parameter study on the erosion of turbine blades subjected to flow containing particulates
… to stator and rotor blades associated with flow containing particulates in turbines is investigated. The main parameters studied are blade leading edge thickness, blade turning angle, turbine inlet temperature, particle size, and particle densities. The computer programs used in the …
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To start or not to start: that is the question
… three different cone setups, and viscous and inviscid flow computations. These tests were then compared to determine what effects would cause the tunnel to unstart. Unstarting refers to flow not reaching Mach 6 at the apex of the cone or reflection shocks impinging on the surface of the cone …
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Viscous-inviscid interaction for incompressible flows over airfoils
… concerning viscous effects in incompressible flows over airfoils. These effects are taken into account by assuming the existence of a boundary layer which interacts with an external inviscid flow. Numerical methods for solving the inviscid and boundary-layer flows are briefly described. The …
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A theoretical and numerical procedure for predicting sailing yacht lift and drag
… yacht hull is presented. A simultaneous viscous/inviscid algorithm is developed by coupling a low order panel method with quasi three-dimensional integral boundary layer equations. A transom condition is used to prevent non-zero wave heights at the stern for a hull with overhangs. The influence …
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Vorticity Modeling for the Flow Over Surface-Mounted Prisms
Vorticity modeling is used to simulate the flow around a surface-mounted prism. The objective is to examine whether vorticity modeling can give satisfactory information about surface pressure fluctuations which are mostly due to the outer or inviscid flow. Differences between results obtained with …
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Numerical simulation and control of a fluid structure interaction for a plate in a transverse flow
The control of a moving structure in an unbounded flow has numerous applications in engineering, such as the aileron on an airplane. Here an approach is proposed where a CFD method is coupled with a controller to provide a qualitative flow model, and a tool for the development and the validation of …
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A Volume of Fluid (VoF) based all-mach HLLC Solver for Multi-Phase Compressible Flow with Surface-Tension
… work presents an all-Mach method for two-phase inviscid flow in the presence of surface tension. A modified version of the Hartens, Lax, Leer and Contact (HLLC) approximate Riemann solver based on Garrick et al. [1] is developed and combined with the popular Volume of Fluid (VoF) method: …
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Towards a hybrid CFD platform for investigating aircraft trailing vortices
… by demonstrating its ability to model the flow field, including trailing vortex structures, around the NASA Common-Research-Model (CRM) under transonic flow conditions. Inviscid flow was assumed and the trailing vortices from both wing and horizontal stabiliser accurately resolved to 3 and …
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Aerodynamic pitch-up of cranked arrow wings: estimation, trim, and configuration design
… flight due to leading edge vortex influence, flow separation and vortex breakdown. The work presented here describes an investigation conducted to study past research on the longitudinal aerodynamic characteristics of highly-swept cranked wing planforms, the development of a new method to …
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