Journal of Fluids Engineering: Recent submissions
Now showing items 1421-1440 of 9024
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The Inefficacy of Chauvenet's Criterion for Elimination of Data Points
(The American Society of Mechanical Engineers (ASME), 2017)Chauvenet's criterion is commonly used for rejection of outliers from sample datasets in engineering and physical science research. Measurement and uncertainty textbooks provide conflicting information on how the criterion ... -
Aerodynamics and Vortex Flowfield of a Slender Delta Wing With Apex Flap and Tip Flap
(The American Society of Mechanical Engineers (ASME), 2017)The effect of apex flap and tip flap, deflected both independently and jointly, on the vortex flow and lift generation of a 65 deg-sweep delta wing was investigated experimentally. The drooped apex flap produced a higher ... -
Influence of Freestream Turbulence Intensity on Bypass Transition Parameters in a Boundary Layer
(The American Society of Mechanical Engineers (ASME), 2017)An experimental investigation was carried out to study the turbulent flow behind passive grids in a subsonic wind tunnel. The enhanced level of turbulence was generated by five wicker metal grids with square meshes and ... -
Unsteady Flow Structures and Pressure Pulsations in a Nuclear Reactor Coolant Pump With Spherical Casing
(The American Society of Mechanical Engineers (ASME), 2017)Severe vibrations induced by flow instabilities in the nuclear reactor coolant pump (RCP) are detrimental to the safe operation of the pump. Due to the particular spherical casing in the RCP, the internal flow structures ... -
Experimental Characterization and Simulation of a Piezo-Actuated Micro Dispensing Valve
(The American Society of Mechanical Engineers (ASME), 2017)The dispensing behavior of a piezo-actuated micro-valve that closes the gap between the nanoliter range (e.g., inkjet technology) and the microliter range (e.g., standard displacement technology) has been investigated by ... -
Assessment of Transition Modeling and Compressibility Effects in a Linear Cascade of Turbine Nozzle Guide Vanes
(The American Society of Mechanical Engineers (ASME), 2017)The flow field in a linear cascade of highly loaded turbine nozzle guide vanes (NGVs) has been numerically investigated at low and high-subsonic regime, i.e., exit isentropic Mach number of M2is = 0.2 and 0.6, respectively. ... -
Self-Similarity Analysis of Turbulent Wake Flows
(The American Society of Mechanical Engineers (ASME), 2017)This paper investigates the self-similarity properties in the far downstream of high Reynolds number turbulent wake flows. The growth rate of the wake layer width, dδ/dx; the decaying rate of the maximum velocity defect, ... -
Direct Numerical Simulation of Pebble Bed Flows: Database Development and Investigation of Low-Frequency Temporal Instabilities
(The American Society of Mechanical Engineers (ASME), 2017)Computational analyses of fluid flow through packed pebble bed domains using the Reynolds-averaged Navier–Stokes (RANS) framework have had limited success in the past. Because of a lack of high-fidelity experimental or ... -
Unsteady Flow of Fluids With Arbitrarily Time-Dependent Rheological Behavior
(The American Society of Mechanical Engineers (ASME), 2017)This paper presents an analytical solution of the momentum equation for the unsteady motion of fluids in circular pipes, in which the kinematic viscosity is allowed to change arbitrarily in time. Velocity and flow rate are ... -
The Effects of Inflow Uncertainties on the Characteristics of Developing Turbulent Flow in Rectangular Pipe and Asymmetric Diffuser
(The American Society of Mechanical Engineers (ASME), 2017)In the current paper nondeterministic computational fluid dynamics (CFD) computations of three-dimensional (3D), developing, and statistically steady turbulent flow through an asymmetric diffuser with moderate adverse ... -
Large Eddy Simulation of Unsteady Cavitating Flow Around a Highly Skewed Propeller in Nonuniform Wake
(The American Society of Mechanical Engineers (ASME), 2017)Unsteady cavitating flows around propellers become increasingly prominent on large-scale and high-speed ships, but large eddy simulations (LES) are limited in the literature. In this study, numerical simulation of an ... -
An Improved Model Including Length Scale Anisotropy for the Pressure Strain Correlation of Turbulence
(The American Society of Mechanical Engineers (ASME), 2017)In this paper, we consider the evolution of decaying homogeneous anisotropic turbulence without mean velocity gradients, where only the slow pressure rate of strain is nonzero. A higher degree nonlinear return-to-isotropy ... -
Detached-Eddy Simulation of Ground Effect on the Wake of a High-Speed Train
(The American Society of Mechanical Engineers (ASME), 2017)The influence of ground effect on the wake of a high-speed train (HST) is investigated by an improved delayed detached-eddy simulation. Aerodynamic forces, the time-averaged and instantaneous flow structure of the wake are ... -
Turbulent Flows Over a Backward Facing Step Simulated Using a Modified Partially Averaged Navier–Stokes Model
(The American Society of Mechanical Engineers (ASME), 2017)A modified partially averaged Navier–Stokes model (MPANS) is proposed by treating the standard k–ε model as the parent model and formulating the unresolved-to-total kinetic energy ratio fk as a function of the local grid ... -
Effect of Gas/Liquid Shearing on the Viscoelastic Instability of a Planar Sheet
(The American Society of Mechanical Engineers (ASME), 2017)The Kelvin–Helmholtz instability of viscoelastic flows was examined through a linear instability analysis. Due of the position change of viscoelastic effects, different unstable responses of liquid elastic effects and ... -
Control of Blow-Down Wind Tunnel Using Combined Extended Kalman and Nonlinear Predictive Filters
(The American Society of Mechanical Engineers (ASME), 2017)A blow-down wind tunnel is a typical nonlinear time-varying system facing the coupling effects between the pressure and temperature during the short-time test procedure. The control of blow-down wind tunnels has been ... -
Part Load Vortex Rope as a Global Unstable Mode
(The American Society of Mechanical Engineers (ASME), 2017)Renewable energy sources (RES) have reached 23.7% of the worldwide electrical generation production in 2015. The hydraulic energy contribution amounts to 16.6% and comes mainly form large-scale hydropower plants, where ... -
Developing Region Solution for High Reynolds Number Laminar Flows of Pseudoplastic and Dilatant Fluids in Circular Ducts
(The American Society of Mechanical Engineers (ASME), 2017)This article reports the results of a numerical computation of the length and total pressure drop in the entrance region of a circular tube with laminar flows of pseudoplastic and dilatant fluids at high Reynolds numbers ... -
Numerical Simulation of Added Mass Effects on a Hydrofoil in Cavitating Flow Using Acoustic Fluid–Structure Interaction
(The American Society of Mechanical Engineers (ASME), 2017)A fluid–structure interaction (FSI) system has been solved using the coupled acoustic structural finite element method (FEM) to simplify the cavitating flow conditions around a hydrofoil. The modes of vibration and the ... -
Eddy Viscosity and Reynolds Stress Models of Entropy Generation in Turbulent Channel Flows
(The American Society of Mechanical Engineers (ASME), 2017)This paper presents new models of entropy production for incompressible turbulent channel flows. A turbulence model is formulated and analyzed with direct numerical simulation (DNS) data. A Reynolds-averaged Navier–Stokes ...