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Volume 7: Fluids Engineering最新文献

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Influence of Corner Radius on Flow Past Square Cylinder With Tandem Arrangements 转角半径对串联式方形圆柱流动的影响
Volume 7: Fluids Engineering Pub Date : 2019-11-11 DOI: 10.1115/imece2019-12222
S. Miran, F. Ahmad, Waseem Arif, Kamran Nazir
{"title":"Influence of Corner Radius on Flow Past Square Cylinder With Tandem Arrangements","authors":"S. Miran, F. Ahmad, Waseem Arif, Kamran Nazir","doi":"10.1115/imece2019-12222","DOIUrl":"https://doi.org/10.1115/imece2019-12222","url":null,"abstract":"\u0000 The Flow Past square cylinder with tandem arrangement is numerically analyzed using Commercial Finite volume code. The fixed Reynolds number (Re.) 100 is selected for the present study. However, corner radius to diameter ratio, R/D = 0 to 0.5 and L/D = 1.5 to 7.5 spacing between two cylinders is used as a varying parameter. The flow visualization parameters, the drag and lift coefficients are comprehensively presented and compared for different cases in order to reveal the effect of corner radius and gap spacing on the behavior of the flow. The obtained results have shown that flow aerodynamic characteristics are strongly influenced by cylinders rounded corners and spacing. It was also found that the total drag force can be reduced for the downstream cylinder when cylinders are placed within L/D ≤ 4.5.","PeriodicalId":229616,"journal":{"name":"Volume 7: Fluids Engineering","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133005977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Adaptation of an Existing Impeller Design to Large Bore Requirements: Aerodynamic Considerations 现有叶轮设计适应大口径要求:气动考虑
Volume 7: Fluids Engineering Pub Date : 2019-11-11 DOI: 10.1115/imece2019-11265
V. Jariwala, L. Larosiliere
{"title":"Adaptation of an Existing Impeller Design to Large Bore Requirements: Aerodynamic Considerations","authors":"V. Jariwala, L. Larosiliere","doi":"10.1115/imece2019-11265","DOIUrl":"https://doi.org/10.1115/imece2019-11265","url":null,"abstract":"\u0000 Multistage process centrifugal compressor applications with single shaft rotors supported by only two bearings are quite common. It is sometimes desirable to operate impellers at higher rotational speeds, resulting in relatively compact and cost-effective machines. Such high-speed rotors can, however, pose rotordynamic challenges, and therefore require larger shaft or impeller bore diameters to increase rotor stiffness and rotordynamic stability. This work explores aerodynamically favorable ways to adapt an existing standard bore impeller design to large bore requirements. First, the stage aerodynamic performance and flow range implications of increasing bore diameter are discussed using meanline modeling and vector diagram arguments. Some strategies for adapting a standard bore design to large bore variant are then presented. Attempts are made to identify and clarify technical limitations to the degree of adaptability of an existing impeller to large bore requirements. Finally, a CFD-backed case study on a large-bore adaptation of a particular stage is presented to clarify practical considerations.","PeriodicalId":229616,"journal":{"name":"Volume 7: Fluids Engineering","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124544768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Three-Dimensional Velocity Field Measurements in Rugged Terrain Using Magnetic Resonance Velocimetry 磁共振测速技术在崎岖地形中的三维速度场测量
Volume 7: Fluids Engineering Pub Date : 2019-11-11 DOI: 10.1115/imece2019-11729
D. Chung
{"title":"Three-Dimensional Velocity Field Measurements in Rugged Terrain Using Magnetic Resonance Velocimetry","authors":"D. Chung","doi":"10.1115/imece2019-11729","DOIUrl":"https://doi.org/10.1115/imece2019-11729","url":null,"abstract":"\u0000 Magnetic resonance imaging techniques were used to collect three-dimensional velocity data measurements of scaled models of a canyon in New Mexico to compare to simulations where a gas was released inside the canyon. The first canyon model covers an area of 1850m × 1030m with a scale of 1:5250 while the second model covers an area of 290m × 160m with a scale of 1:825. A fully turbulent flow with a Reynolds number of 36,000 using the channel hydraulic diameter passes through the canyon geometry for both models. With Magnetic Resonance Velocimetry (MRV), more than 13 million data points were measured to represent flow velocity. The MRV experiment with the 1:5250 scale model helped to identify key terrain features to be included in the next set of measurements of a higher resolution model. MRV not only served as a method of analysis but also as a method for design. The analysis of the data resulted in a new design of a 1:825 scale, which had a higher resolution of the terrain surrounding the gas release point. The preliminary scans from the 1:825 scale model showed a much more dynamic flow around the release point than observed in the 1:5250 scale model. Counter-rotating vortices and circulation can be observed in the 1:825 scale model. This data set will be used to compare to Sandia National Laboratories’ simulations of turbulent flows in a complex terrain.","PeriodicalId":229616,"journal":{"name":"Volume 7: Fluids Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122101066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigation of Conduit Flow Past Corrugated Structures Using Large Eddy Simulations 用大涡模拟研究波纹结构的导管流动
Volume 7: Fluids Engineering Pub Date : 2019-11-11 DOI: 10.1115/imece2019-11273
Sushrut Kumar, Ujjwal Suri, Paras Sachdeva, R. Singh
{"title":"Investigation of Conduit Flow Past Corrugated Structures Using Large Eddy Simulations","authors":"Sushrut Kumar, Ujjwal Suri, Paras Sachdeva, R. Singh","doi":"10.1115/imece2019-11273","DOIUrl":"https://doi.org/10.1115/imece2019-11273","url":null,"abstract":"\u0000 The present paper studies the characteristics of a fully turbulent flow of water through a conduit by use of corrugated structures. Methodologies including rough-ribbed walls and particle injection have been utilized for turbulence attenuation in the past. Screens and corrugations are yet another effective tools for reducing turbulence. The proposed investigation focuses on the application of square and hexagonal cross-sectional corrugations which are introduced in the flow for turbulence attenuation inside rectangular conduits. Large Eddy Simulations in three dimensions were performed with OpenFOAM using a pressure-implicit solver and the standard Smagorinsky subgrid-scale model. Dampening of the spanwise velocity component and a relative increase in streamwise velocity component downstream of the corrugation was observed. The power spectral densities (PSD) of the flow upstream and downstream of the corrugation were examined and compared. A significant decrease in turbulent flow power density was observed. Furthermore, characteristics including turbulence intensity contours and isosurfaces of the Q-criterion were visualized. The results conclusively indicate a subsequent decrease in the turbulent nature of flow past corrugated structures.","PeriodicalId":229616,"journal":{"name":"Volume 7: Fluids Engineering","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127227941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Assessment of Different Turbulence Models on Simulations of Confined Jets in a Crossflow at Supercritical Pressure 不同湍流模型对超临界压力下横流受限射流模拟的评价
Volume 7: Fluids Engineering Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-87894
S. Janani, Komal Gada, H. Rahai, F. Davoudzadeh
{"title":"Assessment of Different Turbulence Models on Simulations of Confined Jets in a Crossflow at Supercritical Pressure","authors":"S. Janani, Komal Gada, H. Rahai, F. Davoudzadeh","doi":"10.1115/IMECE2018-87894","DOIUrl":"https://doi.org/10.1115/IMECE2018-87894","url":null,"abstract":"Numerical investigations of using two different turbulence models of K-ε and K-ω on mixing characteristics of two confined jets in a crossflow at supercritical pressure have been performed. The confined jets were at 180 degrees from each other injecting into a round tube. The jet to crossflow mass flows ratio, r, was 2.96. Reynolds Averaged Navier Stokes (RANS) equations were solved using Siemens PLM CCM+ software. Results indicate higher mixing rate with K-ω turbulence model. Higher vorticity and lower turbulent kinetic energy are observed with k-ω turbulence model. Increased mixing indicate reduced velocity and pressure gradients and cooler fluid toward the tube wall.","PeriodicalId":229616,"journal":{"name":"Volume 7: Fluids Engineering","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123442127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Stereoscopic Particle Shadow Velocimetry 立体粒子阴影测速
Volume 7: Fluids Engineering Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-88013
Jeff R. Harris, M. Mcphail, Christine Truong, A. Fontaine
{"title":"Stereoscopic Particle Shadow Velocimetry","authors":"Jeff R. Harris, M. Mcphail, Christine Truong, A. Fontaine","doi":"10.1115/IMECE2018-88013","DOIUrl":"https://doi.org/10.1115/IMECE2018-88013","url":null,"abstract":"Stereoscopic particle image velocimetry (SPIV) is a variant of particle image velocimetry (PIV) that allows for the measurement of three components of velocity along a plane in a flow field. In PIV, particles in the flow field are tracked by reflecting laser light from tracer particles into two angled cameras, allowing for the velocity field to be determined. Particle shadow velocimetry (PSV) is an inherently less expensive velocity measurement method since the method images shadows cast by particles from an LED backlight instead of scattered light from a laser. Previous studies have shown that PSV is an adequate substitute for PIV for many two-dimensional, two-component velocimetry measurements. In this work, the viability of the two-dimensional, three-component stereoscopic particle shadow velocimetry (SPSV) is demonstrated by using SPSV to examine a simple jet flow. Results obtained using SPIV are also used to provide benchmark comparison for SPSV measurements. Results show that in-plane and out-of-plane velocities measured using SPSV are comparable to those measured using SPIV.","PeriodicalId":229616,"journal":{"name":"Volume 7: Fluids Engineering","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122586640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
LES and Hybrid RANS-LES Simulation of a Pulsating Channel Flow 脉动通道流动的LES和混合ranss -LES模拟
Volume 7: Fluids Engineering Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-87990
Tausif Jamal, Huiyu Wang, D. K. Walters
{"title":"LES and Hybrid RANS-LES Simulation of a Pulsating Channel Flow","authors":"Tausif Jamal, Huiyu Wang, D. K. Walters","doi":"10.1115/IMECE2018-87990","DOIUrl":"https://doi.org/10.1115/IMECE2018-87990","url":null,"abstract":"Simulation of turbulent boundary layers for flows characterized by unsteady driving conditions is important for solving complicated engineering problems such as combustion, blood flow in stenosed arteries, and flow over immersed structures. These flows are often dominated by complex vortical structures, regions of varying turbulence intensities, and fluctuating pressure fields. Pulsating channel flow is one such case that presents a unique set of challenges for newly developed and existing turbulence models used in computational fluid dynamics (CFD) solvers. In the present study, performance of the dynamic hybrid RANS-LES model (DHRL) with exponential time averaging (ETA) is evaluated against Monotonically Integrated Large Eddy Simulation (MILES) and a previously documented LES study for a fully developed channel flow with a time-periodic driving pressure gradient. Results indicate that MILES over predicts mean streamwise velocity for all forcing frequencies while the DHRL model with ETA provides a method for improved results, especially for the lower frequencies. It is concluded that a hybrid RANS-LES model with ETA is a useful alternative to simulate unsteady non-stationary flows but further work is needed to determine the appropriate filter width for ETA to significantly improve the predictive capabilities of the DHRL model.","PeriodicalId":229616,"journal":{"name":"Volume 7: Fluids Engineering","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114581308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Preliminary Investigation of the Effect of Dielectrophoresis on Colloidal Transport and Deposition in Evaporating Droplets 介质电泳对蒸发液滴中胶体迁移和沉积影响的初步研究
Volume 7: Fluids Engineering Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-88054
Xi Li, K. Maki, M. Schertzer
{"title":"Preliminary Investigation of the Effect of Dielectrophoresis on Colloidal Transport and Deposition in Evaporating Droplets","authors":"Xi Li, K. Maki, M. Schertzer","doi":"10.1115/IMECE2018-88054","DOIUrl":"https://doi.org/10.1115/IMECE2018-88054","url":null,"abstract":"This work investigates the effect of negative dielectrophoresis (DEP) on polystyrene particles inside an evaporating DI water droplet on a PDMS surface. Deposition patterns of actuated droplets transitioned from a scalloped rings to a striped deposition pattern as the particle diameter increased from 20 nm to 1 μm. Increased particle size dramatically increases the negative DEP force on particles that push them toward the lower field gradient expected in fluid between active electrodes. Interestingly, deposition patterns became more uniform when particle diameter was increased to 5 μm. This uniform pattern appears to be due to interfacial trapping as the diffusion rate of the large particles was significantly slower than the velocity of the descending interface. This work suggests that DEP can be used to control deposition patterns left by evaporating colloidal droplets, but further work examining the electric field gradient inside the droplet is required to determine if this technique can be applied to a wider range of particle sizes.","PeriodicalId":229616,"journal":{"name":"Volume 7: Fluids Engineering","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123942925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on the Numerical Analysis of In-Line Type Subsea Separator for Liquid-Liquid Mixture Flow 液-液混合流直列式水下分离器数值分析研究
Volume 7: Fluids Engineering Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-87301
Young-Ju Kim, N. Woo, Hyunji Kim, Sangmok Han, Jiho Ha, S. Huh
{"title":"Study on the Numerical Analysis of In-Line Type Subsea Separator for Liquid-Liquid Mixture Flow","authors":"Young-Ju Kim, N. Woo, Hyunji Kim, Sangmok Han, Jiho Ha, S. Huh","doi":"10.1115/IMECE2018-87301","DOIUrl":"https://doi.org/10.1115/IMECE2018-87301","url":null,"abstract":"Subsea separation is an attractive and economic solution to develop deep offshore oil and gas fields producing fluid without hydrate or wax. The subsea separation system should be reliable to ensure successful operation in a wide range of multiphase flow regime. A subsea separator can avoid or simplifying costly surface platforms of floating vessels, as well as being an efficient tool to enhance hydrocarbon production. One solution of interest is the separation and re-injection of water at the seabed to avoid bringing the water up to the surface facility. In this study, liquid-liquid flow characteristics inside in-line type subsea separation system are investigated for the design of subsea separation system. The separation efficiency of the subsea separator is determined through experiments that are the liquid-liquid phased separation. Also internal swirl element (ISE) modeling of the separator was optimized. The analysis results were utilized to improve the reliability and efficiency of the subsea separation system.","PeriodicalId":229616,"journal":{"name":"Volume 7: Fluids Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130117120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Investigation of Three-Dimensional Lagrangian Coherent Structures in Flow Past Single and Arrays of Plate: Linear Energy Harvesting Applications 三维拉格朗日相干结构在流过单板和板阵列中的研究:线性能量收集的应用
Volume 7: Fluids Engineering Pub Date : 2018-11-09 DOI: 10.1115/IMECE2018-86332
Bashar Attiya, I-Han Liu, Muhannad Altimemy, Cosan Daskiran, A. Oztekin
{"title":"Investigation of Three-Dimensional Lagrangian Coherent Structures in Flow Past Single and Arrays of Plate: Linear Energy Harvesting Applications","authors":"Bashar Attiya, I-Han Liu, Muhannad Altimemy, Cosan Daskiran, A. Oztekin","doi":"10.1115/IMECE2018-86332","DOIUrl":"https://doi.org/10.1115/IMECE2018-86332","url":null,"abstract":"Large Eddy Simulations (LES) are performed to investigate the coherent structures in flows past a single and an array of tandem plates. Lagrangian coherent structures (LCS) are used to investigate the nonlinear vortex dynamics of flow past a single plate. The Finite-Time Lyapunov Exponent (FTLE) is calculated using the velocity data obtained from Large Eddy Simulations (LES). All simulations are conducted at Reynolds number of 50,000. LCS for a single plate is presented in this study to elucidate and comprehend highly turbulent flow interactions in these flows. The LCS is compared against most commonly used Eulerian structures which are contours of the vorticity and the Q-criterion. The FTLE fields reveal much clearer turbulent structures compared to the Eulerian structures. FTLE better describes the evolution of larger scale eddies. The Q-criterion of flows past an array of plates is also presented.","PeriodicalId":229616,"journal":{"name":"Volume 7: Fluids Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130700193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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