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Showing 1 to 18 of 18 for “"flow transition"”.
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Computational fluid dynamics modelling of multi-phase flow transition in presence of solid particles.
Multi-phase flow is the type of flow common in the oil and gas industry, as oil reservoirs contain mixtures of oil, gas and water with sand particles from sandstone reservoirs. Accurate design of oil and gas production equipment greatly depends on detailed understanding of this flow phenomena. …
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Shift - flap : Shear-layer instabilities and flow transition – A fundamental link to airfoil performance
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-19 without embargo terms
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The Computer Simulation of Dilute Solution Particle Dynamics
… is described. Equilibrium, shear and extensional flow fields are considered. The program tracks particles individually and is therefore capable of calculating statistical averages of a wide range of properties; particle inertia and Brownian motion are included in the simulation, although …
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The Effects of Particles Momentum Transfer in Shock Wave/Boundary Layer Interaction
… of solid particles seeded into a supersonic flow containing an oblique shockwave reflection were performed in order to observe and understand the momentum transfer effects between solid and gas phases in shock-wave / boundary layer interaction. Particle size and mass loading were varied to …
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Stability and Vortex Shedding of Bluff Body Arrays
… two-dimensional stability analysis of the flow in several configurations of inline and staggered array geometries was performed. The growth rate, eigenfunction, and frequency of the disturbances were determined. The critical Reynolds number for flow transition in each case was identified …
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Computations of Flow Structures and Heat Transfer in a Dimpled Channel at Low to Moderate Reynolds Number
… are used to investigate the three-dimensional flow structure and understand its influence on the heat transfer in a channel with concave indentations on one wall. A dimple depth to channel height ratio of 0.4 and dimple depth to imprint diameter ratio of 0.2 is used in the calculations. The …
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Fluid flow and heat transfer in transonic turbine cascades
… to be able to understand and predict the fluid flow and heat transfer in turbine blades to enable the modifications and improvements in the design process. The use of numerical experiments for the above purposes is becoming increasingly common. The present thesis is involved with the development …
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Design and Analysis of Low Reynolds Number Marine Propellers with Computational Fluid Dynamics (CFD) Transition Modeling
… at low Reynolds numbers, where laminar-turbulent transition of the boundary layer can impact the distributions of pressure and shear stress on the blade surface. Marine propellers operating at low Reynolds numbers are subject to laminar-turbulent transition of the boundary layer, which impacts the …
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Integrated Liquid/Steam Multiphase Flow Sensors for Geothermal Applications
… of fiber optic sensors to detect the multiphase flow. The Department of Energy (DOE) is interested in creating steam wells, and the purpose of the research is to determine the capabilities of fiber optic sensors developed by NanoSonic Inc. to operate effectively in the detection of a multiphase …
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Modeling of three-dimensional viscoelastic flows with free surfaces using a finite element method
… isothermal, incompressible, creeping flow of a Giesekus fluid with free surfaces at infinite capillary number. The code is an extension of the parallel methods developed by Caola et al. from two- to three-dimensional flows, a restructured and improved version of the three-dimensional …
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Three-dimensional Integral Boundary Layer Method for Viscous Aerodynamic Analysis
… Finally, this work develops the capability of flow transition prediction that is missing from existing 3D IBL methods. Two ways of numerical treatment for free transition are proposed and compared in detail, namely, transition fitting versus transition capturing. With its advantageous …
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Aerodynamic and Aeroacoustic Analysis of Low Reynolds Number Propellers Using Higher-Order RANS Transition Turbulence Modeling
… ($Re$) number regimes. In such regimes, the flow experiences complex boundary layer phenomena like laminar separation, flow transition and reattachment. These effects are known to greatly alter the flow at and near the rotor wall, influencing its aerodynamic performance as well as the noise …
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Technology Demonstration of a Megawatt-Class Integrated Motor Drive for Aircraft Propulsion
… on channel surface roughness, as system cooling flow limits constrain its operation to the flow transition regime. Synchronous excitation of the spindle modes via the destabilizing electromagnetic rotor-stator forces is a key challenge for the overhung rotor architecture due to the absence of an …
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Evolution of an Acoustic Disturbance to Transition in the Boundary Layer on an Airfoil
… on a two-dimensional airfoil up through transition to turbulent flow. The experiment was conducted at the NASA Langley Research Center "2 ft by 3 ft Low Speed Wind Tunnel Facility." The primary objective of the experiment was to generate a comprehensive database that includes the effect …
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Computational analysis of planar wings designed for optimum span-load
… state and semi-transient states to predict ow transition. A comparative study of different turbulence models revealed k-omega-SST and k - kL-omega to be the most suitable turbulence models for this study. The model accuracy was determined using validations with experimental data from a previous …
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Hot-Wire Anemometer for the Boundary Layer Data System
… BLDS with a sensor that could directly measure flow velocity fluctuations caused by turbulence. Hot-wires are commonly operated in constant-temperature mode for high frequency response, but require a carefully tuned bridge. The constant-voltage anemometer (CVA) uses a simple op-amp circuit to …
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Numerical lnvestigation of Disturbance Environments in Low Pressure Turbines
… and blade oscillations on the separation-induced transition on the suction surface of a low pressure turbine blade are analyzed. Two configurations are considered: (i) a flat plate subjected to streamwise pressure gradient representative of the suction surface of a low pressure turbine blade, (ii) …
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Non-equilibrium effects on in-tube condensation from superheated vapor
… energy is transferred out of the refrigerant flow. As a result, the thermodynamically averaged temperature, namely the bulk temperature, of the refrigerant decreases. Conventionally when a 3-zone approach is adopted, as the specific enthalpy of the refrigerant flow becomes that of bulk quality …