Journal of Fluids Engineering: Recent submissions
Now showing items 1201-1220 of 9024
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Numerical Simulation of a Pump–Turbine Transient Load Following Process in Pump Mode
(The American Society of Mechanical Engineers (ASME), 2018)This paper presents the simulation of the dynamic behavior of variable speed pump–turbine. A power reduction scenario at constant wicket gate opening was numerically analyzed from 100% to 93% rpm corresponding to a power ... -
A Representation Theory-Based Model for the Rapid Pressure Strain Correlation of Turbulence
(The American Society of Mechanical Engineers (ASME), 2018)In the presence of mean strain or rotation, the anisotropy of turbulence increases due to the rapid pressure strain term. In this paper, we consider the modeling of the rapid pressure strain correlation of turbulence. The ... -
A Phenomenological Model for Turbulent Heat Flux in High-Speed Flows With Shock-Induced Flow Separation
(The American Society of Mechanical Engineers (ASME), 2018) -
Inducer and Centrifugal Pump Contributions to the Rotordynamic Fluid Forces Acting on a Space Turbopump
(The American Society of Mechanical Engineers (ASME), 2018)The fluid-induced rotordynamic forces acting on a whirling space turbopump composed by an inducer and a radial impeller have been compared to the same forces measured on each single component of the turbomachine (i.e., on ... -
Effect of Blade Cambering on Dynamic Stall in View of Designing Vertical Axis Turbines
(The American Society of Mechanical Engineers (ASME), 2018)This paper presents large eddy simulations (LESs) of symmetric and asymmetric (cambered) airfoils forced to undergo deep dynamic stall due to a prescribed pitching motion. Experimental data in terms of lift, drag, and ... -
Investigation of Wave Characteristics in Oscillatory Motion of Partially Filled Rectangular Tanks
(The American Society of Mechanical Engineers (ASME), 2018)Simulations of oscillatory motion in partially filled rectangular tanks with different tank geometries, fullness ratios, and motion frequencies are presented. Smoothed particle hydrodynamics (SPH) method is used to discretize ... -
Very Low Specific Speed Centrifugal Pump—Hydraulic Design and Physical Limitations
(The American Society of Mechanical Engineers (ASME), 2018)For low-flow and high-head applications, pump types such as progressive cavity or gear pumps are often used. However, centrifugal pumps are much more robust and wear resistant, and are beneficial if they can handle the ... -
Linear Shear Flow Past a Rotating Elliptic Cylinder
(The American Society of Mechanical Engineers (ASME), 2018)Simulations are carried out for linear shear flow past a rotating elliptic cylinder to investigate the effect of shear flow on hovering vortex. An in-house fluid solver that is based on immersed boundary method (IBM) is ... -
Rotordynamic Forces Acting on a Two-Stage Inducer
(The American Society of Mechanical Engineers (ASME), 2018)Rocket turbopumps sometimes experience self-excited shaft vibration due to rotordynamic forces. To prevent this vibration, a key step is to establish a method to measure and evaluate the rotordynamic forces that act on ... -
A Flow Control Study of a Simplified, Oscillating Truck Cabin Using PANS
(The American Society of Mechanical Engineers (ASME), 2018)This work presents an application of the partially averaged Navier–Stokes (PANS) equations for an external vehicle flow. In particular, the flow around a generic truck cabin is simulated. The PANS method is first validated ... -
An Efficient Method of Generating and Characterizing Filter Substrates for Lattice Boltzmann Analysis
(The American Society of Mechanical Engineers (ASME), 2018)To provide porous media substrates that are quick to generate and characterize for lattice Boltzmann analysis, we propose a straightforward algorithm. The method leverages the benefits of the lattice Boltzmann method (LBM), ... -
Velocity and NO-Lifetime Measurements in an Unseeded Hypersonic Air Flow
(The American Society of Mechanical Engineers (ASME), 2018)A laser-induced fluorescence (LIF)-based nitric-oxide flow-tagging technique was applied to measure both velocity and NO lifetime in a hypersonic shock tunnel from two experimental test runs. The results were supported by ... -
Efficient Computational Fluid Dynamics Model for Transient Laminar Flow Modeling: Pressure Wave Propagation and Velocity Profile Changes
(The American Society of Mechanical Engineers (ASME), 2018)In this paper, the analysis of fast laminar transients in pressurized pipes is developed using a computational fluid dynamics (CFD) model, combined with the Zielke model and laboratory data. The systematic verification of ... -
Nonlinear Lifting Line Theory Applied to Vertical Axis Wind Turbines: Development of a Practical Design Tool
(The American Society of Mechanical Engineers (ASME), 2018)Recently, a new interest in vertical axis wind turbine (VAWT) technology is fueled by research on floating support structures for large-scale offshore wind energy application. For the application on floating structures at ... -
Uncertainty Quantification of Leakages in a Multistage Simulation and Comparison With Experiments
(The American Society of Mechanical Engineers (ASME), 2018)This paper presents a numerical study of the impact of tip gap uncertainties in a multistage turbine. It is well known that the rotor gap can change the gas turbine efficiency, but the impact of the random variation of the ... -
Aeroacoustic Analysis of the Tonal Noise of a Large-Scale Radial Blower
(The American Society of Mechanical Engineers (ASME), 2018)Large-scale radial blowers are widely used in factories and are one of the main sources of noise. The present study aims at identifying the noise generation mechanisms in such a radial blower in order to suggest simple ... -
Effect of Gas Diffusion Layer Surface Wettability Gradient on Water Behavior in a Serpentine Gas Flow Channel of Proton Exchange Membrane Fuel Cell
(The American Society of Mechanical Engineers (ASME), 2018)Water removal and behavior, in proton exchange membrane fuel cell (PEMFC) gas flow channel has been investigated in this work. Single serpentine gas flow channel has been simulated. Hydrodynamics of water drops in a ... -
On the Approximation of Two-Dimensional Transient Pipe Flow Using a Modified Wave Propagation Algorithm
(The American Society of Mechanical Engineers (ASME), 2018)In this study, a second-order accurate Godunov-type finite volume method is used for the solution of the two-dimensional (2D) water hammer problem. The numerical scheme applied here is well balanced and is able to treat ... -
Investigations Into the Flow Behavior in a Nonparallel Shrouded Diffuser of a Centrifugal Fan for Augmented Performance
(The American Society of Mechanical Engineers (ASME), 2018)It is a well-known fact that the diffuser of a centrifugal fan plays a vital role in the energy transformation leading to better static pressure rise and efficiency. Many researchers have worked on modified geometry with ... -
Hemodynamics Characteristics of a Four-Way Right-Atrium Bypass Connector
(The American Society of Mechanical Engineers (ASME), 2018)Currently, the surgical procedure followed by the majority of cardiac surgeons to address right ventricular dysfunction is the Fontan procedure, which connects the superior vena cava and inferior vena cava (IVC) directly ...