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RISDifferential Equation-Based Specification of Turbulence Integral Length Scales for Cavity Flows
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A new modeling approach has been developed that explicitly accounts for expected turbulent eddy length scales in cavity zones. It uses a hybrid approach with Poisson and Hamilton–Jacobi differential equations. These are ...
Enhanced Delayed Detached Eddy Simulation for Cavities and Labyrinth Seals
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A range of popular hybrid Reynolds-averaged Navier–Stokes -large eddy simulation (RANS-LES) methods are tested for a cavity and two labyrinth seal geometries using an in-house high-order computational fluid dynamics (CFD) ...
Toward Investigation of External Oil Flow From a Journal Bearing in an Epicyclic Gearbox
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: High loads and bearing life requirements make journal bearings the preferred choice for use in high-power, planetary gearboxes in jet engines. With the planet gears rotating about their own axis and orbiting around the sun ...
Simulation of a Simplified Aeroengine Bearing Chamber Using a Fully Coupled Two-Way Eulerian Thin Film/Discrete Phase Approach Part I: Film Behavior Near the Bearing
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Previous work at the Gas Turbine and Transmissions Research Center (G2TRC) has highlighted the need for an adequate computational model, which can appropriately model the oil shedding behavior from bearings. Oil can break ...
Modeling of Partially Wetting Liquid Film Using an Enhanced Thin Film Model for Aero-Engine Bearing Chamber Applications
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In the case of aero-engine, thin lubricating film servers dual purpose of lubrication and cooling. Prediction of dry patches or lubricant starved region in bearing or bearing chambers are required for safe operation of ...
Multiphase Computational Fluid Dynamics Modeling of External Oil Flow From a Journal Bearing
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: High loads and bearing life requirements make journal bearings a potential choice for use in high power, epicyclic gearboxes in jet engines. Particularly, in a planetary configuration, the kinematic conditions are complex. ...
A Comparison of Volume of Fluid and Euler–Euler Approaches in Computational Fluid Dynamics Modeling of Two-Phase Flows With a Sharp Interface
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In aero-engines, it is important to predict the behavior of shear flows in the different parts such as bearing chambers or gearboxes. In bearing chambers, the thickness distribution of wavy films is well studied as two-phase ...
Simulation of a Simplified Aeroengine Bearing Chamber Using a Fully Coupled Two-Way Eulerian Thin Film/Discrete Phase Approach Part II: Droplet Behavior in the Chamber
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Within aeroengines, bearing chambers exhibit a highly complex two-phase environment as a result of the complex air/oil interactions. The desire to operate at both higher temperatures and shaft speeds requires a sufficient ...
Windage Torque Reduction in Low-Pressure Turbine Cavities Part I: Concept Design and Numerical Investigations
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The windage torque on rotational walls has a negative effect on the performance of the low-pressure turbine. In this paper, three novel flow control concepts (FCCs) were proposed to reduce the windage torque within a turbine ...