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Journal of Applied Fluid Mechanics
Scopus
ISSN 1735-3572 · Isfahan University of Technology · 2.465 artikel di indeks
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Numerical Investigation of Hydrothermal Performance Enhancement Using Modified Twisted Tape Having a Curved and Concave Cross-section Inserted in a Horizontal Tube
The present study investigated the enhancement of convective heat transfer in horizontal tubes using twisted tape inserts, particularly emphasizing the influence of modifications to their geometrical configurations. Three twisted tape models were designed using SolidWorks: a plain tape, a tape with…
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Numerical Study of String Cavitation and Spray Dynamics in a High-disturbance Nozzle under Engine-operating Conditions
String cavitation in injector nozzles has been shown to improve spray atomization while mitigating cavitation erosion. Herein, to comprehensively investigate flow behaviors under realistic engine conditions, we employ a validated computational fluid dynamics model to simulate coupled in-nozzle…
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Unsteady Characteristics of Shock Waves in the Variable Nozzle Turbine of a Turbocharger
Variable nozzle turbine can enhance the transient response of engine through the regulation of nozzle opening. Under the operating condition characterized by high expansion ratio and small nozzle opening, strong unsteady shock waves tend to develop at the trailing edge of the nozzle blades. These…
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Experimental Investigations of Surface Roughness Effects on Aerodynamic Performance of Axial Compressor Blades
This study experimentally investigates the aerodynamic behavior of axial compressor blades under different surface roughness conditions. An open-circuit blowing-type wind tunnel was modified to conduct tests on a linear cascade of compressor blades. The experiments covered a Reynolds number range…
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Smoothed Particle Hydrodynamics Simulation of Bingham Fluid Flow in Obstructed Channels: A Comparative Study of Viscosity Regularization Models
This study investigates pressure-driven Bingham fluid flow in two-dimensional channels with various obstacle configurations using the smoothed-particle hydrodynamics (SPH) method. Two benchmark regularization models are employed: the Papanastasiou model and the Bercovier and Engelman (B&E) model…
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Influence of Draft Tube Diffusion Angle on the Hydraulic Performance of a Double-suction Centrifugal Pump as a Turbine
Pumps as turbines (PATs) are widely applied in micro-hydropower stations and chemical industries as economical and efficient energy recovery devices. This study used numerical simulations and entropy dissipation theory to investigate the influence of four draft tube diffusion angles (β0, β1, β2…
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A CFD-based Spectral Synthesis Method for Decoupling Longitudinal and Vertical Turbulence Effects on Box Girder Aerodynamics
Conventional aerodynamic analyses for long-span bridges often assume equivalence between longitudinal (u-) and vertical (w-) turbulence components, potentially compromising accuracy. This study introduces a novel numerical approach to decoupling u- and w-turbulence effects. By combining Adjustable…
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Design and Transient Flow Characteristics of New Differential Large Flow Safety Valve
This paper presents a novel differential-type high-flow safety valve, with a rated flow and pressure of 3000 L/min and 50 MPa respectively, aimed at enhancing the impact resistance and stability of hydraulic supports. Based on the Ansys Fluent platform, dynamic mesh technology and User-Defined…
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Rotation Rate Influence on Flow Around Porous Media Coated Circular Cylinders
Experimental rotation effects on flow past cylinders have been observed. The cylinders have the porous media coatings (PMC) named PMC1, PMC2, PMC3 and PMC4. For the range of rotation rates, including α = 0.52, α = 1.05 and α = 1.57, the flow characteristics have been presented at a Reynolds number…
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Coupling Impacts of the Spanwise Shear Flow and the End Effects on the Magnus Effect for a Cylinder with Two Free Ends
The coupled effects of the spanwise shear flow and the free ends on the Magnus effect of a finite cylinder were investigated in this paper. Large eddy simulations were conducted, maintaining a Reynolds number of 4.6×104 and a constant aspect ratio of 10. The spin ratio ranged from 0 to 3, and the…
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Aerodynamic Characteristics and Galloping Stability of Iced Contact Lines in High-speed Railways: A Computational Fluid Dynamics and Experimental Study
The current collection reliability in high-speed railways is threatened by flow-induced oscillations of contact lines that have accumulated ice. A substantial body of literature on transmission line galloping has repeatedly documented the influence of ice-covered thickness and airflow velocity…
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Effects of Key Inlet Design Parameters on the Performance of Supplementary Combustion Nozzle
Solid rocket motors (SRMs) have limited propulsion performance due to their short fuel combustion duration and low specific impulse. The supplementary combustion nozzle (SCN) injects air into the nozzle expansion section to promote secondary combustion of unburned exhaust gases, providing a novel…
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Aerodynamic Noise Characteristics of Metro Train in Tunnels at Different Speeds
Currently, the operating speed of a certain metro line’s trains in the tunnel has reached 140 km/h and is advancing toward the target of 160 km/h, making it urgent to research the aerodynamic noise of metro trains in tunnel. This paper conducts numerical simulation research on the unsteady…
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Large Eddy Simulation Study on the Wind Characteristics of a Steep Escarpment
This work aims to study the influencing factors and spatial distribution characteristics of wind parameters in typical steep escarpment terrain. The narrowband synthetic random flow generation (NSRFG) method is employed to set target turbulent wind parameters, and large eddy simulations (LES) are…
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Role of Bluff Body Configuration in Modifying Turbulent Flow in Sudden Expansions
This study combines experimental and numerical approaches to investigate flow behavior downstream of bluff bodies placed at the mid-span of a rectangular sudden expansion configurations common in combustion chambers, burners, flame stabilizers, and chemical mixers. The three-dimensional, steady…
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Investigation of the Effects of using Rear Wings in the Diffuser Region on the Aerodynamic Performance of the Ahmed Body
In the current research, different configurations of wing-equipped diffusers at the rear of the standard Ahmed body were investigated to identify the optimal model for drag reduction and downforce enhancement. The investigations were conducted at Reynolds numbers ranging from 0.33×106 to 2.01×106…
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Influence of Aerodynamic Shape Parameters on Flight Qualities of Flying Wing Configuration
This study aims to explore how specific aerodynamic shape parameters impact the performance and flight stability of a flying wing design. We began with a modified double-sweep SACCON planform as our foundational geometry, refining it through the Ring Vortex Lattice Method (R-VLM) in conjunction…
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Hydrothermal Analysis of Pulsating SWCNT–water Nanofluid in a Triangular Corrugated Heat Channel: Comparative Study of Homogeneous Single-phase and Two-phase Eulerian–Lagrangian Models
Enhancing heat transfer performance in heated corrugated channels has become a main focus of investigation because of its crucial role in an extensive range of thermal systems. In the current study, a numerical investigation is carried out to examine the influence of laminar pulsating flow and…
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Optimization of High-speed Train Wind Brake Devices using a Dynamic Weighted Hybrid Surrogate Model Based on Local Error Evaluation
With the continuous increase in the speed of high-speed trains (HSTs), traditional friction braking no longer meets the requirement for rapid stopping over short distances. Wind brake devices (WBDs) serve as a crucial supplementary mechanism to enhance braking performance. Therefore, investigating…
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Coupled Fluid–structure Interaction Simulation of Aerodynamic Load Fluctuations and Fatigue Life in a Centrifugal Fan FN280
Rotating machinery such as centrifugal fans is often exposed to unsteady aerodynamic loads that can induce fatigue damage during prolonged industrial operation. This study investigates the fatigue life of a centrifugal fan (FN280) used in a cement plant through a one-way fluid–structure interaction…
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