Journal of Fluids Engineering: Recent submissions
Now showing items 1081-1100 of 9024
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Effect of Trailing-Edge Flap Deflection on a Symmetric Airfoil Over a Wavy Ground
(The American Society of Mechanical Engineers (ASME), 2019)The effect of trailing-edge flap (TEF) deflection on the aerodynamic properties and flowfield of a symmetric airfoil over a wavy ground was investigated experimentally. This Technical Brief is a continuation of Lee and ... -
A Unified Methodology to Evaluate the Radiated Noise Due to Turbulent Boundary Layer Flows
(The American Society of Mechanical Engineers (ASME), 2019)For vibro-acoustic applications, a turbulent wall pressure (TWP) fluctuations model was derived. The model is based on the resolution of Poisson's equation. The pressure is characterized in time and space through its ... -
Numerical Investigation Into the Effects of Motion Parameters on Energy Extraction of the Parallel Foils
(The American Society of Mechanical Engineers (ASME), 2019)Due to the deficiency of the research on parallel foils, the parallel configuration of foils is concerned and the effects of motion parameters on energy extraction are systematically discussed in the present study. The ... -
A Thin Film Fluid Structure Interaction Model for the Study of Flexible Structure Dynamics in Centrifugal Pumps
(The American Society of Mechanical Engineers (ASME), 2019)This paper describes a fluid-structure interaction (FSI) model for the study of flexible cloth-like structures or the so-called rags in flows through centrifugal pumps. The structural model and its coupling to the flow ... -
Effective Geometric Algorithms for Immersed Boundary Method Using Signed Distance Field
(The American Society of Mechanical Engineers (ASME), 2019)We present three algorithms for robust and efficient geometric calculations in the context of immersed boundary method (IBM), including classification of mesh cells as inside/outside of a closed surface, projection of ... -
Strakes Effects on Asymmetric Flow Over a Blunt-Nosed Slender Body at a High Angle of Attack
(The American Society of Mechanical Engineers (ASME), 2019)In general speaking, the missiles execute flight at high angles of attack in order to enhance their maneuverability. However, the inevitable side-force, which is caused by the asymmetric flow over these kinds of traditional ... -
Analysis of Turbulence Characteristics in Two Large Concentric Annular Ducts Through Particle Image Velocimetry
(The American Society of Mechanical Engineers (ASME), 2019)An experimental study is presented on water single-phase flow in two 10.5 m-long annular ducts, with external pipe's internal diameter (De) of 155 mm and two concentric internal pipes of external diameters (Di) of 60 mm ... -
The Role of Forcing and Eddy Viscosity Variation on the Log-Layer Mismatch Observed in Wall-Modeled Large-Eddy Simulations
(The American Society of Mechanical Engineers (ASME), 2019)We investigate the role of eddy viscosity variation and the effect of zonal enforcement of the mass flow rate on the log-layer mismatch problem observed in turbulent channel flows. An analysis of the mean momentum balance ... -
Comparison of Computational Fluid Dynamics Simulations and Experiments for Stratified Air-Water Flows in Pipes
(The American Society of Mechanical Engineers (ASME), 2019)Stratified gas–liquid flow is a flow regime typically encountered in multiphase pipelines. The understanding and modeling of this regime is of engineering importance especially for the oil and gas industry. In this work, ... -
Investigation on Combined Air and Water Injection in Francis Turbine Draft Tube to Reduce Vortex Rope Effects
(The American Society of Mechanical Engineers (ASME), 2019)In this paper, the effect of water, air, and their combined injection from two different injection points is studied in order to reduce vorticity effects in a draft tube of prototype turbine working at three operating ... -
The Effect of Midplane Guide Vanes in a Biplane Wells Turbine
(The American Society of Mechanical Engineers (ASME), 2019)Guide vanes (GVs) improve the performance of a turbine in terms of efficiency, torque, or operating range. In this work, a concept of different orientations of GVs in between a two-row biplane wells turbine (BWT) was ... -
The Effect of the Nozzle Top Lip Thickness on a Two-Dimensional Wall Jet
(The American Society of Mechanical Engineers (ASME), 2019)The effect of the nozzle top lip thickness on a two-dimensional wall jet was examined experimentally in a wind tunnel using hot-wire anemometry. Lip thicknesses of 0.125b, 0.5b, 1b, and 2b, where b is the jet nozzle height, ... -
Single Orifice Diesel Injector Flow Characterization and the Impact of Needle Lift Using Large Eddy Simulation and Proper Orthogonal Decomposition
(The American Society of Mechanical Engineers (ASME), 2019)The flow in the injector's sac volume has been reported to influence diesel-injector nozzle flow, but few studies have characterized sac volume. Our study modeled flow in the sac volume using a large Eddy simulation (LES) ... -
Analytical Evaluation of Head and Flow Rate Off-Design Characteristics for Pump as Turbine Application
(The American Society of Mechanical Engineers (ASME), 2019)Head and flow rate are the important parameters for proper selection of centrifugal pump. However, the reversed operation of centrifugal pump leads to the off-design characteristic of head and flow rate. This paper presents ... -
Dynamic Stall Flow Structure and Forces on Symmetrical Airfoils at High Angles of Attack and Rotation Rates
(The American Society of Mechanical Engineers (ASME), 2019)This article describes a direct comparison between two symmetrical airfoils undergoing dynamic stall at high, unsteady reduced frequencies under otherwise identical conditions. Particle image velocimetry (PIV) was performed ... -
Analysis of Flow Instabilities on a Three-Bladed Axial Inducer in Fixed and Rotating Frames
(The American Society of Mechanical Engineers (ASME), 2019)The paper describes the results of recent experiments carried out in the Cavitating Pump Rotordynamic Test Facility for the dynamic characterization of cavitation-induced flow instabilities as simultaneously observed in ... -
Dynamics of the Blade Channel of an Inducer Under Cavitation-Induced Instabilities
(The American Society of Mechanical Engineers (ASME), 2019)A high-head three-bladed inducer has been equipped with pressure taps on the hub along the blade channels with the aim of more closely investigating the dynamics of cavitation-induced instabilities developing in the impeller ... -
Dynamic Stability Analysis of a Flexible Rotor Filled With Liquid Based on Three-Dimensional Flow
(The American Society of Mechanical Engineers (ASME), 2019)This paper deals with the dynamic stability of a flexible liquid-filled rotor. On the basis of three-dimensional flow, the fluid perturbation motion is analyzed and the fluid–structure interaction equation is established, ... -
Predicting the Colebrook–White Friction Factor in the Pipe Flow by New Explicit Correlations
(The American Society of Mechanical Engineers (ASME), 2019)Determination of friction factor (f) in pipe flow is necessary for various applications dealing with fluid flow. The Colebrook–White equation is the most accepted technique for the f-values estimation in turbulent flow. ... -
A Comprehensive Hydrodynamics-Salinity-pH Model for Analyzing the Effects of Freshwater Withdrawals in Calcasieu Lake and Surrounding Water Systems
(The American Society of Mechanical Engineers (ASME), 2019)The study is a continuation of the authors' previous works on hydrodynamics and sediment transport modeling for Calcasieu Lake area (located in southwest Louisiana) (Zhang, N., Zheng, Z. C., and Yadagiri, S., 2011, “A ...