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Journal articles on the topic '3D turbulence characteristics'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

Martirosyan, A. A., V. I. Mileshin, Ya M. Druzhinin та P. G. Kozhemyako. "Сomputational and Experimental Investigation of Aerodynamic Characteristics of a Counter-Rotating fan Using Various Software Packages". Herald of the Bauman Moscow State Technical University. Series Mechanical Engineering, № 2 (125) (квітень 2019): 115–30. http://dx.doi.org/10.18698/0236-3941-2019-2-115-130.

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The paper presents the results of computing aerodynamic properties of the CRTF2A counter-rotating cowled fan developed as part of the European VITAL program. To achieve these results, we used the following software packages: NUMECA FINE TURBO, ANSYS CFX and CIAMs own 3D--IMP--MULTI hydrocode. We use the RANS approach to model turbulent flows. We performed a three-dimensional computation, completing Reynolds-averaged Navier --- Stokes equations by various turbulence models for the following relative angular frequency modes: n = 1 and 0.9. We used the following turbulence models available in the

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2

Wu, Guohong, Xiangyu Duan, Jianghui Zhu, Xiaoqin Li, Xuelin Tang, and Hui Gao. "Investigations of hydraulic transient flows in pressurized pipeline based on 1D traditional and 3D weakly compressible models." Journal of Hydroinformatics 23, no. 2 (2021): 231–48. http://dx.doi.org/10.2166/hydro.2021.134.

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Abstract Transient flow characteristics and dissipation mechanism in pressurized pipeline were investigated based on 1D friction models and 3D turbulence models, where the pressure–density model was combined into the 3D continuity equation allowing for the elasticity of the fluid and the pipes. The applicability of 3D realizable k–ε and 3D SST (shear stress transport) k–ω turbulence models was verified with comparison to 1D traditional water hammer models and the experimental data for fast closing of the valve in the reservoir–pipe–valve system. The valve closure rule was instantaneously carri

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3

Barthelmie, R. J., P. Crippa, H. Wang, et al. "3D Wind and Turbulence Characteristics of the Atmospheric Boundary Layer." Bulletin of the American Meteorological Society 95, no. 5 (2014): 743–56. http://dx.doi.org/10.1175/bams-d-12-00111.1.

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4

Lopes, Pedro, Rita F. Carvalho, and Jorge Leandro. "Numerical and experimental study of the fundamental flow characteristics of a 3D gully box under drainage." Water Science and Technology 75, no. 9 (2017): 2204–15. http://dx.doi.org/10.2166/wst.2017.071.

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Numerical studies regarding the influence of entrapped air on the hydraulic performance of gullies are nonexistent. This is due to the lack of a model that simulates the air-entrainment phenomena and consequently the entrapped air. In this work, we used experimental data to validate an air-entrainment model that uses a Volume-of-Fluid based method to detect the interface and the Shear-stress transport k-ω turbulence model. The air is detected in a sub-grid scale, generated by a source term and transported using a slip velocity formulation. Results are shown in terms of free-surface elevation,

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5

Liu, Y. L., B. Lv, and W. L. Wei. "Simulation of 3D Gas-Liquid Two-Phase Flow Characteristics of Carrousel Oxidation Ditch." Advanced Materials Research 482-484 (February 2012): 1265–68. http://dx.doi.org/10.4028/www.scientific.net/amr.482-484.1265.

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In this paper, the gas–liquid two-phase mixture model with the k-ε turbulence model was used to numerically simulate the characteristics of an oxidation ditch. The proposed model concerns with the drag force and the drift velocity. The numerical method is based on a pressure-correction algorithm of the SIMPLE-type. A multigrid technique based on the full approximation storage (FAS) scheme is employed to accelerate the numerical convergence, while the κ-ε model with wall functions is used. The numerical results for velocity and turbulent kinetic energy in the oxidation ditch are obtained．

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6

Chang, Hsuan, Chii-Dong Ho, Yih-Hang Chen, et al. "Enhancing the Permeate Flux of Direct Contact Membrane Distillation Modules with Inserting 3D Printing Turbulence Promoters." Membranes 11, no. 4 (2021): 266. http://dx.doi.org/10.3390/membranes11040266.

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Two geometric shape turbulence promoters (circular and square of same areas) of different array patterns using three-dimensional (3D) printing technology were designed for direct contact membrane distillation (DCMD) modules in the present study. The DCMD device was performed at middle temperature operation (about 45 °C to 60 °C) of hot inlet saline water associated with a constant temperature of inlet cold stream. Attempts to reduce the disadvantageous temperature polarization effect were made inserting the 3D turbulence promoters to promote both the mass and heat transfer characteristics in i

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7

Yuan, Hao, Ruichang Hu, Xiaoming Xu, Liang Chen, Yongqin Peng, and Jiawan Tan. "Numerical Investigation of Vertical Crossflow Jets with Various Orifice Shapes Discharged in Rectangular Open Channel." Energies 13, no. 6 (2020): 1505. http://dx.doi.org/10.3390/en13061505.

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Vertical jet in flowing water is a common phenomenon in daily life. To study the flow and turbulent characteristics of different jet orifice shapes and under different velocity ratios, the realizable k-ε turbulent model was adopted to analyze the three-dimensional (3D) flow, turbulence, and vortex characteristics using circular, square, and rectangular jet orifices and velocity ratios of 2, 5, 10, and 15. The following conclusions were drawn: The flow trajectory of the vertical jet in the channel exhibits remarkable 3D characteristics, and the jet orifice and velocity ratio have a significant

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8

Wei, W. L., X. J. Zhao, Y. L. Liu, and X. F. Yang. "3D Numerical Simulation of Flow through a 90 Bending Square Duct." Applied Mechanics and Materials 170-173 (May 2012): 3560–64. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.3560.

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Abstract:A computational model is implemented to investigate hydraulic characteristics of turbulent flow through a 90 bending square duct. In the numerical solution the governing equations are first transformed by using boundary-fitted coordinate to map the physical domain to a uniform transformed space, subsequently discretized by finite-volume method and collocated grid system, and solved via SIMPLEC algorithm.The flow parameters at the control surface are obtained by momentum interpolation method. The modified k-ε turbulence model is applied to close the Reynolds stresses. The 3D hydraulic

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9

Dou, Xiping, Xinzhou Zhang, Xiao-dong Zhao, and Xiangming Wang. "LOCAL SCOUR CHARACTERISTICS OF GROINS AT TIDAL WATERWAYS AND THEIR SIMULATION." Coastal Engineering Proceedings 1, no. 32 (2011): 66. http://dx.doi.org/10.9753/icce.v32.sediment.66.

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For the channel regulation in tidal rivers, groins are often used as typical hydraulic structures. Precisely predicting the local scour depth at the groin head is the key for the project of river regulation. The local scour of groins for tidal rivers is significantly different from that for the undirectional steady flow of general rivers. In the present paper, a three-dimendional (3D) mathematical model for turbulence and sediment transport are establishmented. The local scour near the groin under the actions of tidal current and steady flow are simulated by established 3D turbulence and sedim

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10

Zobeyer, Hasan, Abul B. M. Baki, and Saika Nowshin Nowrin. "Interactions between Tandem Cylinders in an Open Channel: Impact on Mean and Turbulent Flow Characteristics." Water 13, no. 13 (2021): 1718. http://dx.doi.org/10.3390/w13131718.

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The flow hydrodynamics around a single cylinder differ significantly from the flow fields around two cylinders in a tandem or side-by-side arrangement. In this study, the experimental results on the mean and turbulence characteristics of flow generated by a pair of cylinders placed in tandem in an open-channel flume are presented. An acoustic Doppler velocimeter (ADV) was used to measure the instantaneous three-dimensional velocity components. This study investigated the effect of cylinder spacing at 3D, 6D, and 9D (center to center) distances on the mean and turbulent flow profiles and the di

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11

Mahananda, Minakshee, Prashanth Reddy Hanmaiahgari, and Ram Balachandar. "Effect of aspect ratio on developing and developed narrow open channel flow with rough bed." Canadian Journal of Civil Engineering 45, no. 9 (2018): 780–94. http://dx.doi.org/10.1139/cjce-2017-0458.

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This study attempts to unravel the effect of aspect ratio on the turbulence characteristics in developing and fully developed narrow open channel flows. In this regard, experiments were conducted in a rough bed open channel flow. Instantaneous 3D velocities were acquired using an acoustic Doppler velocimeter at various locations along the centerline of the flume. The variables of interest include the mean components of the flow velocity, turbulence intensity, wall normal Reynolds shear stress, correlation coefficient, turbulence kinetic energy, and anisotropy. A new correlation between the equ

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12

Yu, Zhenzhen, Lei Zhang, Yuxia Yang, Lingling Wang, Ruiling Wang, and Hai Zhu. "Turbulence Characteristics of Internal Waves in an Improved 3D Numerical Wave Tank." IOP Conference Series: Earth and Environmental Science 376 (December 17, 2019): 012037. http://dx.doi.org/10.1088/1755-1315/376/1/012037.

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13

Liu, Hu Ying, Chang Bo Jiang, Bin Deng, and Zhi Xin Guan. "Experimental and Numerical Study of 3D Hydrodynamic Characteristics in an Excavated Harbor Basin." Applied Mechanics and Materials 212-213 (October 2012): 1092–97. http://dx.doi.org/10.4028/www.scientific.net/amm.212-213.1092.

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As a kind of common port layout forms, excavated harbor basin was widely applied with its many advantages. But the sediment transport processes and water motion in such harbor are complex and of obvious three-dimensional characteristics affected by a lot of factors. To investigate the 3D hydrodynamic characteristics in an excavated harbor basin, experimental research based on PIV technology and numerical study through a 3D code with DES turbulence model has been developed respectively. The 3D hydrodynamic and sediment deposition characteristics in the harbor have been indicated successfully in

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14

Li, Jun, Yongmei Cao, and Chuanchang Gao. "Numerical simulation of flow patterns in the forebay and suction sump of Tianshan pumping station." Water Practice and Technology 9, no. 4 (2014): 519–25. http://dx.doi.org/10.2166/wpt.2014.058.

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Tianshan Pumping Station takes water from the Yellow River. A three-dimensional (3D) mathematical model of turbulence flow patterns in the forebay and suction sump was developed and a 3D turbulent flow simulation technique applied to numerical calculation of the flow pattern characteristics in both the original and rebuilt forebays of the pumping station. The numerical simulation results were analyzed and contrasted. The results showed that, with technical improvement, surface backflow was avoided, and bottom velocity in the forebay was increased while bottom velocity in the suction sump was u

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15

Rautenberg, Alexander, Jonas Allgeier, Saskia Jung, and Jens Bange. "Calibration Procedure and Accuracy of Wind and Turbulence Measurements with Five-Hole Probes on Fixed-Wing Unmanned Aircraft in the Atmospheric Boundary Layer and Wind Turbine Wakes." Atmosphere 10, no. 3 (2019): 124. http://dx.doi.org/10.3390/atmos10030124.

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For research in the atmospheric boundary layer and in the vicinity of wind turbines, the turbulent 3D wind vector can be measured from fixed-wing unmanned aerial systems (UAS) with a five-hole probe and an inertial navigation system. Since non-zero vertical wind and varying horizontal wind causes variations in the airspeed of the UAS, and since it is desirable to sample with a flexible cruising airspeed to match a broad range of operational requirements, the influence of airspeed variations on mean values and turbulence statistics is investigated. Three calibrations of the five-hole probe at t

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16

Ghaderi, Amir, Mehdi Dasineh, Francesco Aristodemo, and Costanza Aricò. "Numerical Simulations of the Flow Field of a Submerged Hydraulic Jump over Triangular Macroroughnesses." Water 13, no. 5 (2021): 674. http://dx.doi.org/10.3390/w13050674.

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The submerged hydraulic jump is a sudden change from the supercritical to subcritical flow, specified by strong turbulence, air entrainment and energy loss. Despite recent studies, hydraulic jump characteristics in smooth and rough beds, the turbulence, the mean velocity and the flow patterns in the cavity region of a submerged hydraulic jump in the rough beds, especially in the case of triangular macroroughnesses, are not completely understood. The objective of this paper was to numerically investigate via the FLOW-3D model the effects of triangular macroroughnesses on the characteristics of

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17

Tian, Hai Ping, Shao Qiong Yang, and Nan Jiang. "Topological Characteristics of Coherent Structures in the Turbulent Boundary Layer Measured by Tomo-PIV." Advanced Materials Research 718-720 (July 2013): 801–6. http://dx.doi.org/10.4028/www.scientific.net/amr.718-720.801.

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Database of time series of the instantaneous three-dimensional three-component (3D-3C) velocity vector field, measured by tomographic time-resolved PIV(Tomo-PIV) in a water tunnel, was analyzed to investigate spatial topologies of coherent structures in the turbulent boundary layer (TBL). A new concept of spatial locally averaged velocity structure function of turbulence is put forward to describe the spatial dilation or compression of the multi-scale coherent structures in the TBL. According to the physical mechanism of dilation or compression of multi-scale coherent vortex structures in the

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18

Salari, Mahmoud, Mohammad Mehdi Rashidi, Emad Hasani Malekshah, and Masoud Hasani Malekshah. "Numerical analysis of turbulent/transitional natural convection in trapezoidal enclosures." International Journal of Numerical Methods for Heat & Fluid Flow 27, no. 12 (2017): 2902–23. http://dx.doi.org/10.1108/hff-03-2017-0097.

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Purpose Because the local Re numbers, ratio of inertia to viscous forces, are not same at different regions of the enclosures, the present study aims to deal with the influences of using the turbulent/transition models on numerical results of the natural convection and flow field within a trapezoidal enclosure. Design/methodology/approach The three-dimensional (3D) trapezoidal enclosure with different inclined side walls of 75, 90 and 105 degrees are considered, where the side walls are heated and cooled at Ra = 1.5 × 109 for all cases. The turbulent models of the k-ε-RNG, k- ω-shear-stress tr

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19

Ji, Hong, Wei Guo Zhu, Song Chen, and Jing Zhao. "Digital Analysis of Hydraulic Cone Valve Turbulence Based on Fluent 3D Solver." Applied Mechanics and Materials 385-386 (August 2013): 93–96. http://dx.doi.org/10.4028/www.scientific.net/amm.385-386.93.

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The hydraulic cone valve is an important basic component in Fluid drive and control technology. Characteristic of cone valve inner flow filed influences directly the valves performance. Especially when fluid flow in runner is turbulent, characteristics of flow field have great influence on the valves working performance.Main work of this paper is numerical calculation and simulation of cone valve inner runner flow field inside hydraulic hammer. First make a 3D modeling for cone valve using Pro/E, by fluent this paper analyses and discusses the distribution of hydraulic cone valve internal flow

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20

Wang, Jun. "Research on the Separation Performance of Deoiling Hydrocyclones." Applied Mechanics and Materials 608-609 (October 2014): 14–18. http://dx.doi.org/10.4028/www.scientific.net/amm.608-609.14.

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This paper uses FLUENT as the researching tools of 3D numerical simulation of deoiling hydrocyclones, analysis on the geometric structure of deoiling Hydrocyclone, summed up a set of grid partition method based on the basic theory and turbulence simulation of CFD theory, to determine a reasonable mathematical model, boundary conditions, convection diffusion the discrete format and pressure velocity coupling algorithm. This paper establishes the mathematical model, calculation method and the optimization principle for the separation mechanism; it also provides basic theory and experience for st

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21

Lin, Ying-Tien, Yu Yang, Yu-Jia Chiu, and Xiaoyan Ji. "Hydrodynamic Characteristics of Flow in a Strongly Curved Channel with Gravel Beds." Water 13, no. 11 (2021): 1519. http://dx.doi.org/10.3390/w13111519.

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This study experimentally and numerically investigated the hydrodynamic characteristics of a 180° curved open channel over rough bed under the condition of constant downstream water depth. Three different sizes of bed particles (the small, middle and big cases based upon the grain size diameter D50) were selected for flume tests. Three-dimensional instantaneous velocities obtained by the acoustic Doppler velocimeter (ADV) were used to analyze hydrodynamic characteristics. Additionally, the Renormalization-Group (RNG) turbulence model was employed for numerical simulations. Experimental results

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22

Cui, Jun Hua, Wei Xu, and Zheng Hua Guo. "Coupled Thermo-Flowing 3D Steady State Model of Friction Stir Welding Process." Applied Mechanics and Materials 470 (December 2013): 325–29. http://dx.doi.org/10.4028/www.scientific.net/amm.470.325.

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The coupled thermo-flowing 3D steady-state model of friction stir welding model is established based on fluid mechanics. With analyzing the impact of pin shoulder and pin on heat producing, the model considers the influence of pin on the heat producing processing. The model applies viscoplastic constitutive equations to describe the material, and turbulence model to simulate the material flowing behavior. With the additional turbulence kinetic energy equations and flow boundary condition equations, the model is established. With Comsol Multiphysics finite analysis software, a process simulatio

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23

Roy, S., K. Barman, V. K. Das, K. Debnath, and B. S. Mazumder. "Experimental Investigation of Undercut Mechanisms of River Bank Erosion Based on 3D Turbulence Characteristics." Environmental Processes 7, no. 1 (2019): 341–66. http://dx.doi.org/10.1007/s40710-019-00417-3.

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Liu, Zhenqing, Yiran Hu, Yichen Fan, Wei Wang, and Qingsong Zhou. "Turbulent Flow Fields Over a 3D Hill Covered by Vegetation Canopy Through Large Eddy Simulations." Energies 12, no. 19 (2019): 3624. http://dx.doi.org/10.3390/en12193624.

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The flow fields over a simplified 3D hill covered by vegetation have been examined by many researchers. However, there is scarce research giving the three-dimensional characteristics of the flow fields over a rough 3D hill. In this study, large eddy simulations were performed to examine the coherent turbulence structures of the flow fields over a vegetation-covered 3D hill. The numerical simulations were validated by the comparison with the wind-tunnel experiments. Besides, the flow fields were systematically investigated, including the examinations of the mean velocities and root means square

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Körtgen, Bastian, Nickolas Pingel, and Nicholas Killerby-Smith. "The spatial power spectrum and derived turbulent properties of isolated galaxies." Monthly Notices of the Royal Astronomical Society 505, no. 2 (2021): 1972–86. http://dx.doi.org/10.1093/mnras/stab1408.

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ABSTRACT The turbulent dynamics of nearby and extragalactic gas structures can be studied with the column density power spectrum that is often described by a broken power law. In an extragalactic context, the breaks in the power spectra have been interpreted to constrain the disc scale height, which marks a transition from 2D disc-like to 3D motion. However, this interpretation has recently been questioned when accounting for instrumental effects. We use numerical simulations to study the spatial power spectra of isolated galaxies and investigate the origins of the break scale. We split the ga

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26

Guimond, Stephen R., Jun A. Zhang, Joseph W. Sapp, and Stephen J. Frasier. "Coherent Turbulence in the Boundary Layer of Hurricane Rita (2005) during an Eyewall Replacement Cycle." Journal of the Atmospheric Sciences 75, no. 9 (2018): 3071–93. http://dx.doi.org/10.1175/jas-d-17-0347.1.

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Abstract The structure of coherent turbulence in an eyewall replacement cycle in Hurricane Rita (2005) is presented from novel airborne Doppler radar observations using the Imaging Wind and Rain Airborne Profiler (IWRAP). The IWRAP measurements and three-dimensional (3D) wind vector calculations at a grid spacing of 250 m in the horizontal and 30 m in the vertical reveal the ubiquitous presence of organized turbulent eddies in the lower levels of the storm. The data presented here, and the larger collection of IWRAP measurements, currently are the highest-resolution Doppler radar 3D wind vecto

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Kim, Youngwoo, Chanhee Moon, Omid Nematollahi, Hyun Dong Kim, and Kyung Chun Kim. "Time-Resolved PIV Measurements and Turbulence Characteristics of Flow Inside an Open-Cell Metal Foam." Materials 14, no. 13 (2021): 3566. http://dx.doi.org/10.3390/ma14133566.

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Open-cell metal foams are porous medium for thermo-fluidic systems. However, their complex geometry makes it difficult to perform time-resolved (TR) measurements inside them. In this study, a TR particle image velocimetry (PIV) method is introduced for use inside open-cell metal foam structures. Stereolithography 3D printing methods and conventional post-processing methods cannot be applied to metal foam structures; therefore, PolyJet 3D printing and post-processing methods were employed to fabricate a transparent metal foam replica. The key to obtaining acceptable transparency in this method

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Liang, Ru Quan, Jun Hong Ji, Fu Sheng Yan, and Ji Cheng He. "Numerical Study on Flow Characteristics in a Stirring Vessel." Applied Mechanics and Materials 130-134 (October 2011): 3050–53. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.3050.

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In order to improve the desulphurization efficiency of KR mixing method in the process of molten iron refining, the method of CFD was used to analyze the flow field in a stirring vessel. The Fluent software was adopted to simulate and analyze the internal flow rule in a 3D stirring vessel with the method of multiple reference frame approach, and the corresponding models of Euler two-phase flow fluid model and standard k-ε turbulence model were used. By comparing with the experimental result, the influence of important parameters of agitator on internal flow field in the stirring vessel, such a

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Zahabi, Hamidreza, Mohammadamin Torabi, Ebrahim Alamatian, Mehdi Bahiraei, and Marjan Goodarzi. "Effects of Geometry and Hydraulic Characteristics of Shallow Reservoirs on Sediment Entrapment." Water 10, no. 12 (2018): 1725. http://dx.doi.org/10.3390/w10121725.

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Sediment and deposition are among the main problems in dam engineering and other related fields. Because of the numerous advantages of numerical modeling, effects of different geometries of reservoirs on the flow pattern and deposition of sediments are investigated using the finite volume based Flow-3D software package. In this study, three rectangular reservoirs with different dimensional ratios are simulated using the large eddy simulation (LES) turbulence model. To validate the numerical modeling, existing experimental data is used. Results indicate that Flow-3D can accurately simulate flow

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Fernandes, João N., João B. Leal, and António H. Cardoso. "Influence of floodplain and riparian vegetation in the conveyance and structure of turbulent flow in compound channels." E3S Web of Conferences 40 (2018): 06035. http://dx.doi.org/10.1051/e3sconf/20184006035.

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The present study aims at understanding the changes in the channel conveyance and in the turbulent flow structure due to the presence of both submerged vegetation in the floodplains and riparian vegetation. An experimental campaign was carried out comprising uniform compound channels flows (i) without any kind of vegetation, (ii) with synthetic grass in the floodplains, (iii) with synthetic grass in the floodplains and rods in the interface between main channel and the floodplain and (iv) with synthetic grass in the floodplains and artificial shrubs in the interface between main channel and th

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Yang, Fei, Yuanjian Wang, and Enhui Jiang. "Simplified Spectral Model of 3D Meander Flow." Water 13, no. 9 (2021): 1228. http://dx.doi.org/10.3390/w13091228.

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Most 2D (two-dimensional) models either take vertical velocity profiles as uniform, or consider secondary flow in momentum equations with presupposed velocity profiles, which weakly reflect the spatio-temporal characteristics of meander flow. To tackle meander flow in a more accurate 3D (three-dimensional) way while avoiding low computational efficiency, a new 3D model based on spectral methods is established and verified in this paper. In the present model, the vertical water flow field is expanded into polynomials. Governing equations are transformed by the Galerkin method and then advection

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Xing, Xiao, and Guo Ming Ye. "3D Numerical Simulation of the Airflow in a Pneumatic Splicer." Applied Mechanics and Materials 130-134 (October 2011): 2345–48. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.2345.

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To investigate the effect of air flow in an pneumatic splicer on splicing performance, a computational fluid dynamics (CFD) model has been developed to simulate the air flow characteristics in an splicing chamber. Three-dimensional numerical simulation is conducted and standard K-ε turbulence model is used. Velocity distributions in the chamber are presented and analyzed. The computational results show that the velocities in the chamber are transonic. The air flows in the chamber are two swirling flows with opposite directions. This work also shows that CFD technique can provide a better under

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Kim, Youjin, Galih Bangga, and Antonio Delgado. "Investigations of HAWT Airfoil Shape Characteristics and 3D Rotational Augmentation Sensitivity Toward the Aerodynamic Performance Improvement." Sustainability 12, no. 18 (2020): 7597. http://dx.doi.org/10.3390/su12187597.

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This study investigates the impacts of dierent airfoil shapes on the 3D augmentationand power production of horizontal axis wind turbines (HAWTs). The aerodynamic eect fromchanging the leading and trailing edge of the airfoil is the emphasis of the research. Varied powerproduced from modifying sensitivity on 3D augmentations, caused by revamping airfoil shapes, areshown. The 3D correction law, considering the chord to radius ratio and the blades’ pitch angle inthe rotation, is applied to the airfoil lift coecients. The blade element method (BEM) embeddedin the software Qblade with modified lif

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Barnes, Andrew, Daniel Marshall-Cross, and Ben Richard Hughes. "Validation and comparison of turbulence models for predicting wakes of vertical axis wind turbines." Journal of Ocean Engineering and Marine Energy 7, no. 4 (2021): 339–62. http://dx.doi.org/10.1007/s40722-021-00204-z.

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AbstractVertical axis wind turbine (VAWT) array design requires adequate modelling of the turbine wakes to model the flow throughout the array and, therefore, the power output of turbines in the array. This paper investigates how accurately different turbulence models using 2D computational fluid dynamics (CFD) simulations can estimate near and far wakes of VAWTs to determine an approach towards accurate modelling for array design. Three experiments from the literature are chosen as baselines for validation, with these experiments representing the near to far wake of the turbine. Five URANS tu

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Li, Qun Song, Qian Yang, Zhi Song Li, and Tian Lan Yu. "3D Numerical Simulation of Fluid Flow and Heat Transfer in Tube with Spiral-Flange Insert." Advanced Materials Research 236-238 (May 2011): 1508–15. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.1508.

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With the help of Fluent 6.2 and supporting software, 3D numerical simulation of fluid flow and heat transfer enhancement of plastic spiral tubes were performed on computer, and the velocity, turbulence intensity and improvement of convective heat transfer coefficient distribution in plastic spiral tubes were analyzed and compared with those in smooth tubes, and characteristics of fluid flow and heat transfer were obtained. The results showed that there were obvious axial, tangential and radial velocities in spiral space, and they were bigger than those in smooth tubes. The turbulence intensity

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Souid, Anouar, Wassim Kriaa, Hatem Mhiri, Georges Le Palec, and Philippe Bournot. "Numerical Simulation of a Ceramic Furnace Burner - Capacity of Turbulent and Radiation Models." Defect and Diffusion Forum 283-286 (March 2009): 243–49. http://dx.doi.org/10.4028/www.scientific.net/ddf.283-286.243.

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We intend in this work to model an industrial burner replica of the ceramic tunnel furnace of the Ceramics Modern Society (SOMOCER, TUNISIA). This study aims to evaluate the ability of turbulence and radiation models to predict the dynamics and heat transfer fields. The study is conducted by means of numerical simulations in presence of a reactive flow using the commercial code FLUENT. The 3D Navier-Stokes equations and four species transport equations are solved with the eddy-dissipation (ED) combustion model. We use three turbulence models (k- standard, k- RNG, and RSM) and two radiation m

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Jamińska, Paulina. "The influence of the wind structure definition in the standard k-ε model of turbulence on the distribution of pressure coefficient on the façades of the prism". Budownictwo i Architektura 10, № 1 (2012): 093–104. http://dx.doi.org/10.35784/bud-arch.2233.

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The paper deals with the influence of the definition of turbulence kinetic energy k and dissipation of turbulence kinetic energy ε on wind pressure coefficient distribution on walls of rectangular model. The investigation includes computer simulations for the four cases of boundary conditions, the most common in the literature. In some analysed cases, the wind structure characteristics used in computations were derived from experimental studies performed in the wind tunnel. The results in the form of pressure coefficients were analyzed on the basis of their relevance to the use in the field of

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Zhu, Cheng Xiang, Chun Ling Zhu, and Bin Fu. "3D Ice Accretion Simulation for Complex Configuration Basing on Improved Messinger Model." Advanced Materials Research 1025-1026 (September 2014): 148–55. http://dx.doi.org/10.4028/www.scientific.net/amr.1025-1026.148.

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Ice accretion on 3D complex configuration is studied by numerical methods. The flow field is obtained by using Fluent 6.0 with a S-A turbulence model. Droplet trajectories and impingement characteristics are obtained by using the Eulerian approach. Ice shape is calculated based on the improved Messinger model with a new runback distribution scheme. By applying the method presented in this paper, ice accretion on NACA0012 is computed and the results are in good agreement with the available experiment data. It preliminarily shows that the improved method in this paper is feasible, Meanwhile, ice

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Tian, Chunlai, Tairan Chen, and Tian Zou. "Numerical study of unsteady cavitating flows with RANS and DES models." Modern Physics Letters B 33, no. 20 (2019): 1950228. http://dx.doi.org/10.1142/s0217984919502282.

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Unsteady cavitating flow with high Reynolds number and significant instability commonly exists in fluid machinery and engineering system. The high-resolution approaches, such as direct numerical simulation and large eddy simulation, are not practical for engineering issues due to the significant cost in the computational resource. The objective of this paper is to provide the approach with Detached-Eddy Simulation (DES) model based on the Reynolds-averaged Navier–Stokes (RANS) equations for predicting unsteady cavitating flows. The credibility of the approach is validated by a set of numerical

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Zhao, Long Zhi, Zi Wang, Xin Yan Jiang, Jian Zhang, and Ming Juan Zhao. "Numerical Simulation of Three-Dimensional Molten Pool Temperature Field and Flow Field for Laser Melt Injection Based on Fluent." Advanced Materials Research 538-541 (June 2012): 1837–42. http://dx.doi.org/10.4028/www.scientific.net/amr.538-541.1837.

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According to the characteristics of laser melt injection, a numerical model for a simplified 3D transient temperature field in molten pool was established using FLUENT software in this paper. In the model, many factors were considered such as liquid metal turbulence, latent heat of phase transformation and material thermo physical properties depending on temperature. The results show that the model can be developed well by FLUENT software. And the results also show that the driving force of the liquid metal flow mechanism.

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Huang, Rong, and Naiang Wang. "A Numerical Study of the Flow and Pollutant Dispersion in Valley-River Urban." Advanced Materials Research 645 (January 2013): 208–16. http://dx.doi.org/10.4028/www.scientific.net/amr.645.208.

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Air flow and pollutant dispersion characteristics in a real valley city are studied under the real boundary condition. The 3D computational fluid dynamics using Reynolds-averaged Navier-Stokes modeling was carried out in Lanzhou which is a typical valley city in Northwest, China. The standard κ-ε turbulence model as a simplified computational fluid dynamics model is used to provide moderately fast simulations of turbulent airflow in an urban environment. The modeled flow field indicated that the geometry, wind direction and source location had a significant effects on the flow field. The flow

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ZHU, CHENGXIANG, BIN FU, ZHIGUO SUN, and CHUNLING ZHU. "3D ICE ACCRETION SIMULATION FOR COMPLEX CONFIGURATION BASING ON IMPROVED MESSINGER MODEL." International Journal of Modern Physics: Conference Series 19 (January 2012): 341–50. http://dx.doi.org/10.1142/s2010194512008938.

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Ice accretion on 3D complex configuration is studied by numerical method. The flow field is obtained by using Fluent 6.0 with S-A turbulence model, droplet trajectories and impingement characteristics are obtained using the Eulerian approach, ice shape is calculated basing on the improved Messinger model with a new runback distribution scheme. Using the method presented in this paper, ice accretion on NACA0012 is computed, and the results are in good agreement with the available experiment data. It shows preliminarily that the improved method described in this paper is feasible. Meanwhile, ice

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Aleshin, Vladimir P., Eugene A. Grishin, Oleg A. Ivlev, Dmitry D. Novgorodtsev, and Victor D. Shargorodsky. "The speckle-interferometric images modelling of artificial Earth satellites in problems of near-Earth astronomy." Open Astronomy 27, no. 1 (2018): 120–25. http://dx.doi.org/10.1515/astro-2018-0020.

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Abstract The article represents the results of efficiency estimation for perspective observation facilities of near-Earth astronomy in terms of the AES (artificial Earth’s satellite) optical images obtaining and quality. A mathematical method for modeling optical images based on the induced virtual environment is proposed . A speckle interferometric image registration scheme and bispectral processing are reviewed. Upon modelling, the real speckle interferometric images of stars have been used as scattering functions; the AES orbits and geometry have been set in reliance on the real AES orbits

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Utomo, Tony, Berkah Fajar, and Hendry Arpriyanto. "CFD analysis on the aerodynamics characteristics of Jakarta-Bandung high speed train." MATEC Web of Conferences 159 (2018): 02038. http://dx.doi.org/10.1051/matecconf/201815902038.

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In this study, the aerodynamics characteristics of HST type CRH380A which is planned to be operated on the new railway of Jakarta-Bandung are analysed using Computational Fluid Dynamics. The speed of the train in this simulation was varied from 100 km/h to a maximum designed speed of 350 km/h with the increment of 30 km/h. The train was modelled in 3D computational domain with more than 1.7 million cells. The turbulence model employed in this study was standard k-ω. The simulation results show that the drag coefficient (CD) is slightly decrease by the increase of speed. At the speed of 100 km/

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Popov, Grigorii, Valery Matveev, Oleg Baturin, Julia Novikova, Daria Kolmakova, and Andrei Volkov. "Selection of Parameters for 3D Finite-volume Mesh for CFD Simulation of Axial Turbines." MATEC Web of Conferences 220 (2018): 07001. http://dx.doi.org/10.1051/matecconf/201822007001.

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This article describes the second part of the global work done by the authors aimed at finding the best settings for a numerical model for calculations of axial uncooled turbines using the RANS approach. For the research, more than 1000 models of full-size axial turbines (including multistage turbines) and their elements were created. They differed in the number, size, parameters of the elements of finite volume meshes, in turbulence models, in the degree of simplification. The results were compared with the experimental data. As a result, the following was obtained: 1. A method for developing

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Vasan, A. Mercy, N. Prasanna, M. Vivekanandan, and V. Gopalakrishnan. "CFD investigation of the cold hydrodynamics of a laboratory scale CFB furnace." JOURNAL OF ADVANCES IN CHEMISTRY 12, no. 9 (2016): 4330–40. http://dx.doi.org/10.24297/jac.v12i9.4092.

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This investigation presents a computational and experimental study of the flow characteristics of a laboratory scale CFB cold model riser. i) The first part of the work deals with 2D, CFD validation of a literature based CFB riser of circular cross section of 1m height. Simulation results showed good agreement with experimental literature data for radial profiles of volume fraction and particle velocity. ii) The second part is a work on simulation and experimental verification of a CFB riser flow characteristics of a CFB riser of rectangular cross section (400mm x 550mm x2000mm). An experiment

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Li, Liqun, Yichen Huang, Chunyu Zou, and Wang Tao. "Numerical Study on Powder Stream Characteristics of Coaxial Laser Metal Deposition Nozzle." Crystals 11, no. 3 (2021): 282. http://dx.doi.org/10.3390/cryst11030282.

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A 3D model was established to accurately simulate the internal and external powder stream characteristics of the coaxial discrete three-beam nozzle for laser metal deposition. A k-ε turbulence model was applied in the gas flow phase, and powder flow was coupled to the gas flow by a Euler-Lagrange approach as a discrete phase model. The simulated powder stream morphology was in good agreement with the experimental results of CCD and high-speed camera imaging. The simulation results showed that the length, diameter and shrinkage angle of the powder passage in the nozzle have different effects on

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Walter, Benjamin, Hendrik Huwald, Josué Gehring, Yves Bühler, and Michael Lehning. "Radar measurements of blowing snow off a mountain ridge." Cryosphere 14, no. 6 (2020): 1779–94. http://dx.doi.org/10.5194/tc-14-1779-2020.

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Abstract. Modelling and forecasting wind-driven redistribution of snow in mountainous regions with its implications on avalanche danger, mountain hydrology or flood hazard is still a challenging task often lacking in essential details. Measurements of drifting and blowing snow for improving process understanding and model validation are typically limited to point measurements at meteorological stations, providing no information on the spatial variability of horizontal mass fluxes or even the vertically integrated mass flux. We present a promising application of a compact and low-cost radar sys

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Sagol, Ece, Marcelo Reggio, and Adrian Ilinca. "Assessment of Two-Equation Turbulence Models and Validation of the Performance Characteristics of an Experimental Wind Turbine by CFD." ISRN Mechanical Engineering 2012 (February 15, 2012): 1–10. http://dx.doi.org/10.5402/2012/428671.

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The very first step in the simulation of ice accretion on a wind turbine blade is the accurate prediction of the flow field around it and the performance of the turbine rotor. The paper addresses this prediction using RANS equations with a proper turbulence model. The numerical computation is performed using a commercial CFD code, and the results are validated using experimental data for the 3D flow field around the NREL Phase VI HAWT rotor. For the flow simulation, a rotating reference frame method, which calculates the flow properties as time-averaged quantities, has been used to reduce the

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Jafari, Rahim, and Jueyi Sui. "Velocity Field and Turbulence Structure around Spur Dikes with Different Angles of Orientation under Ice Covered Flow Conditions." Water 13, no. 13 (2021): 1844. http://dx.doi.org/10.3390/w13131844.

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Spur dikes are well-known structures that are widely used in rivers and coastal regions. Depending on their types, sizes, and orientation angles, spur dikes can substantially change flow characteristics. Results of previous studies indicate that the presence of an ice cover in rivers can cause complicated flow structures. The present experimental study investigates velocity fields and turbulence structures in the vicinity of spur dikes under ice cover with different roughness coefficients. The spur dikes were set up at the following three angles of orientation, 90°, 60°, and 45°. Our results s

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