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Journal articles on the topic 'Average Flow Model'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Kim, Tae-Wan, and Yong-Joo Cho. "Average flow model with elastic deformation for CMP." Tribology International 39, no. 11 (2006): 1388–94. http://dx.doi.org/10.1016/j.triboint.2005.12.002.

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2

CHO, Yong-Joo, Tae-Wan KIM, and Young-Pil KOO. "Effect of Kurtosis on the Flow Factors Using Average Flow Model." JSME International Journal Series C 47, no. 1 (2004): 429–34. http://dx.doi.org/10.1299/jsmec.47.429.

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3

Bayada, Guy, Sébastien Martin, and Carlos Vázquez. "An Average Flow Model of the Reynolds Roughness Including a Mass-Flow Preserving Cavitation Model." Journal of Tribology 127, no. 4 (2005): 793–802. http://dx.doi.org/10.1115/1.2005307.

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An average Reynolds equation for predicting the effects of deterministic periodic roughness, taking Jakobsson, Floberg, and Olsson mass flow preserving cavitation model into account, is introduced based upon the double scale analysis approach. This average Reynolds equation can be used both for a microscopic interasperity cavitation and a macroscopic one. The validity of such a model is verified by numerical experiments both for one-dimensional and two-dimensional roughness patterns.

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4

Letalleur, N., F. Plouraboue´, and M. Prat. "Average Flow Model of Rough Surface Lubrication: Flow Factors for Sinusoidal Surfaces." Journal of Tribology 124, no. 3 (2002): 539–46. http://dx.doi.org/10.1115/1.1467084.

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The effects of lubricant film flow, pressurized and sheared between two parallel sinusoidal wavy surfaces in sliding motion is studied analytically. Results are presented using a flow factor model which provides an average description of the surfaces roughness impact. Two distinct cases are studied in order to compare stationary or time dependent local aperture configurations. Flow factors are computed respectively for each case through spatial or spatio-temporal average, revealing striking differences. The results shed light on the relevance of the composite roughness concept. Special attenti

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5

Li, Wang-Long. "Modeling of Head/Disk Interface—An Average Flow Model." Tribology Letters 17, no. 3 (2004): 669–76. http://dx.doi.org/10.1023/b:tril.0000044518.79255.03.

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6

Alammar, Khalid. "Simulation of Average Turbulent Pipe Flow: A Three-Equation Model." Open Journal of Fluid Dynamics 04, no. 01 (2014): 69–73. http://dx.doi.org/10.4236/ojfd.2014.41005.

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7

Goncharov, N. S. "Model of Optimization of Average Flow Speed in a Pipe." Bulletin of the South Ural State University. Series "Mathematical Modelling, Programming and Computer Software" 13, no. 2 (2020): 136–43. http://dx.doi.org/10.14529/mmp200212.

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8

Makino, T., S. Morohoshi, and S. Taniguchi. "Application of Average Flow Model to Thin Film Gas Lubrication." Journal of Tribology 115, no. 1 (1993): 185–90. http://dx.doi.org/10.1115/1.2920974.

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The flow factors for the average Reynolds equation introduced by Patir and Cheng (1978, 1979) are extended to be valid for thin film gas lubrication. The effects of molecular mean free-path on the roughness-induced flow factors are included on the assumption that the local compressibility is small. The derivation of flow factors is carried out by means of the perturbation approach developed by Tripp (1983). The results are expressed in terms of Knudsen number, Peklenik parameter and nondimensional film thickness defined as the ratio of average film thickness and standard deviation of composite

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9

Banihabib, Mohammad Ebrahim, Reihaneh Bandari, and Mohammad Valipour. "Improving Daily Peak Flow Forecasts Using Hybrid Fourier-Series Autoregressive Integrated Moving Average and Recurrent Artificial Neural Network Models." AI 1, no. 2 (2020): 263–75. http://dx.doi.org/10.3390/ai1020017.

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In multi-purpose reservoirs, to achieve optimal operation, sophisticated models are required to forecast reservoir inflow in both short- and long-horizon times with an acceptable accuracy, particularly for peak flows. In this study, an auto-regressive hybrid model is proposed for long-horizon forecasting of daily reservoir inflow. The model is examined for a one-year horizon forecasting of high-oscillated daily flow time series. First, a Fourier-Series Filtered Autoregressive Integrated Moving Average (FSF-ARIMA) model is applied to forecast linear behavior of daily flow time series. Second, a

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10

Cheng, Nian-Sheng. "Single-Layer Model for Average Flow Velocity with Submerged Rigid Cylinders." Journal of Hydraulic Engineering 141, no. 10 (2015): 06015012. http://dx.doi.org/10.1061/(asce)hy.1943-7900.0001037.

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11

Mondal, M. Shahjahan, and Jahir Uddin Chowdhury. "Synthetic Stream-Flow Generation with Deseasonalized ARMA Model." Journal of Hydrology and Meteorology 8, no. 1 (2016): 32–45. http://dx.doi.org/10.3126/jhm.v8i1.15570.

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Time series models are used in river hydrology for synthetic generation. The development of such a model, namely deseasonalized Autoregressive Moving Average (ARMA), for generation of decadal (10-day) flows of the Brahmaputra River in Bangladesh is described. The model was fitted following systematic stages of identification, estimation and diagnostic checking of model building. A negative power transformation for the Brahmaputra flow was found to be necessary for model construction. The seasonality of the flow was removed by Fourier analysis using 5 harmonics for decadal means and 13 harmonic

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12

Korda, David, and Michal Švanda. "Plasma flows and sound-speed perturbations in the average supergranule." Astronomy & Astrophysics 646 (February 2021): A184. http://dx.doi.org/10.1051/0004-6361/202039928.

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Context. Supergranules create a peak in the spatial spectrum of photospheric velocity features. Even though they have some properties of convection cells, their origin is still being debated in the literature. The time–distance helioseismology constitutes a method that is suitable for investigating the deep structure of supergranules. Aims. Our aim is to construct the model of the flows in the average supergranular cell using fully consistent time–distance inverse methodology. Methods. We used the Multi-Channel Subtractive Optimally Localised Averaging inversion method with regularisation of t

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13

Olason, Tryggvi, and W. Edgar Watt. "Multivariate Transfer Function-Noise Model of River Flow for Hydropower Operation." Hydrology Research 17, no. 3 (1986): 185–202. http://dx.doi.org/10.2166/nh.1986.0012.

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The formulation of multivariate autoregressive moving average (ARMA) time series models and their transfer function noise (TFN) form is described. Development of a multivariate TFN model is difficult if the multiple inputs are correlated. Various methods for developing a multivariate TFN models with correlated multiple inputs are critically reviewed. A simple approach to developing multiple input TFN models with correlated inputs is described. This approach is successfully applied to developing a forecasting model for average daily flow of the Mattagami River at Little Long Generation Station

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14

Harp, Susan R., and Richard F. Salant. "An Average Flow Model of Rough Surface Lubrication With Inter-Asperity Cavitation." Journal of Tribology 123, no. 1 (2000): 134–43. http://dx.doi.org/10.1115/1.1332397.

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An average Reynolds equation capable of predicting the effects of roughness induced inter-asperity cavitation is introduced. The average Reynolds equation is based on the JFO cavitation model and the Patir and Cheng flow factor method. The flow factors are calculated in numerical experiments as functions of the local surface separation, surface statistics, and cavitation number. The model is extended into a universal average Reynolds equation capable of predicting the combined effects of inter-asperity cavitation and macroscopic cavitation. Both the Patir and Cheng method and the present model

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15

TAKAHASHI, Kenta, Ryo TSUBOI, and Shinya SASAKI. "The new analytical method under mixed lubrication utilizing an average flow model." Proceedings of Mechanical Engineering Congress, Japan 2018 (2018): S1160402. http://dx.doi.org/10.1299/jsmemecj.2018.s1160402.

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16

Yu, Shao-Wei, and Zhong-Ke Shi. "An improved car-following model with two preceding cars' average speed." International Journal of Modern Physics C 26, no. 08 (2015): 1550094. http://dx.doi.org/10.1142/s0129183115500941.

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To better describe cooperative car-following behaviors under intelligent transportation circumstances and increase roadway traffic mobility, the data of three successive following cars at a signalized intersection of Jinan in China were obtained and employed to explore the linkage between two preceding cars' average speed and car-following behaviors. The results indicate that two preceding cars' average velocity has significant effects on the following car's motion. Then an improved car-following model considering two preceding cars' average velocity was proposed and calibrated based on full v

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17

Gylys, J., M. Jakubcionis, S. Sinkunas, and T. Zdankus. "AVERAGE HEAT TRANSFER OF TUBES IN DOWNWARD FOAM FLOW." Revista de Engenharia Térmica 2, no. 1 (2003): 38. http://dx.doi.org/10.5380/reterm.v2i1.3518.

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The model of heat exchanger was investigated experimentally. This model consists of three vertical lines of horizontal tubes with five tubes in each. Tubes were arranged in a staggered order. Heat transfer of staggered bundle of tubes to downward static stable foam flow was investigated experimentally. Heat transfer dependence on specific gas and liquid velocity was determined. Dependence of volumetric void fraction of foam on heat transfer was investigated also. Heat transfer rate dependence on tube position in the line of tube bundle was investigated experimentally. It was established that h

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18

Sun, Bo, Sudheer Tenneti, Shankar Subramaniam, and Donald L. Koch. "Pseudo-turbulent heat flux and average gas–phase conduction during gas–solid heat transfer: flow past random fixed particle assemblies." Journal of Fluid Mechanics 798 (June 1, 2016): 299–349. http://dx.doi.org/10.1017/jfm.2016.290.

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Fluctuations in the gas-phase velocity can contribute significantly to the total gas-phase kinetic energy even in laminar gas–solid flows as shown by Mehrabadi et al. (J. Fluid Mech., vol. 770, 2015, pp. 210–246), and these pseudo-turbulent fluctuations can also enhance heat transfer in gas–solid flow. In this work, the pseudo-turbulent heat flux arising from temperature–velocity covariance, and average fluid-phase conduction during convective heat transfer in a gas–solid flow are quantified and modelled over a wide range of mean slip Reynolds number and solid volume fraction using particle-re

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19

Meneveau and, Charles, and Joseph Katz. "A Deterministic Stress Model for Rotor-Stator Interactions in Simulations of Average-Passage Flow." Journal of Fluids Engineering 124, no. 2 (2002): 550–54. http://dx.doi.org/10.1115/1.1458580.

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A procedure for modeling deterministic stresses for average-passage simulations of flow in multiple blade-row turbomachines is proposed and tested. This method uses the results of several (two or more) steady Reynolds-averaged Navier-Stokes (RANS) simulations with boundary conditions that are representative of different inflow conditions encountered during the passage of a neighboring blade-row. The deterministic stresses are calculated by averaging the steady results while weighting them with the approximate duration of each inflow condition. This approach incorporates important rotor-stator

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20

Adamczyk, J. J., R. A. Mulac, and M. L. Celestina. "A Model for Closing the Inviscid Form of the Average-Passage Equation System." Journal of Turbomachinery 108, no. 2 (1986): 180–86. http://dx.doi.org/10.1115/1.3262035.

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A mathematical model is proposed for closing or mathematically completing the system of equations which describes the time-averaged flow field through the blade passages of multistage turbomachinery. These equations, referred to as the average-passage equation system, govern a conceptual model which has proven useful in turbomachinery aerodynamic design and analysis. The closure model is developed so as to insure a consistency between these equations and the axisymmetric through-flow equations. The closure model was incorporated into a computer code for use in simulating the flow field about a

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21

Gadda, G., A. Taibi, F. Sisini, M. Gambaccini, P. Zamboni, and M. Ursino. "A new hemodynamic model for the study of cerebral venous outflow." American Journal of Physiology-Heart and Circulatory Physiology 308, no. 3 (2015): H217—H231. http://dx.doi.org/10.1152/ajpheart.00469.2014.

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We developed a mathematical model of the cerebral venous outflow for the simulation of the average blood flows and pressures in the main drainage vessels of the brain. The main features of the model are that it includes a validated model for the simulation of the intracranial circulation and it accounts for the dependence of the hydraulic properties of the jugular veins with respect to the gravity field, which makes it an useful tool for the study of the correlations between extracranial blood redistributions and changes in the intracranial environment. The model is able to simulate the averag

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22

Mondal, M. Shahjahan, and Jahir Uddin Chowdhury. "Generation of 10-day flow of the Brahmaputra River using a time series model." Hydrology Research 44, no. 6 (2012): 1071–83. http://dx.doi.org/10.2166/nh.2012.242.

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Time series models are used in hydrology for the generation of river flow data. The development of such a model, namely deseasonalized Autoregressive Moving Average (ARMA), for the generation of 10-day flows of the Brahmaputra River in Bangladesh is described. The model was fitted following systematic stages of identification, estimation and diagnostic checking of model building. A negative power transformation for the Brahmaputra flow was found to be necessary for model construction. The seasonality of the flow was removed by Fourier analysis using five harmonics for 10-day means and 13 harmo

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23

PANDEY, S. K., and DHARMENDRA TRIPATHI. "UNSTEADY MODEL OF TRANSPORTATION OF JEFFREY-FLUID BY PERISTALSIS." International Journal of Biomathematics 03, no. 04 (2010): 473–91. http://dx.doi.org/10.1142/s1793524510001094.

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The investigation is to explore the transportation of a viscoelastic fluid by peristalsis in a channel as well as in a circular cylindrical tube by considering Jeffrey-model. In order to apply the model to the swallowing of food-bolus through the oesophagus, the wave equation assumed to propagate along the walls is such that the walls contract in the transverse/radial direction and relax but do not expand further. Solutions have been presented in the closed form by using small Reynolds number and long wavelength approximations. The expressions of pressure gradient, volume flow rate and average

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24

Ferret, R. Z. "SDO/HMI observations of the average supergranule are not compatible with separable flow models." Astronomy & Astrophysics 623 (March 2019): A98. http://dx.doi.org/10.1051/0004-6361/201833742.

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Aims. Despite extensive studies carried out since its discovery half a century ago, the nature of supergranulation remains an open question in solar physics. Separability of flow models is a common assumption made in the literature to shed light on the properties of supergranules. This paper studies the ability of separable mass-conserving flow models to reproduce photospheric observations from the Helioseismic Magnetic Imager (HMI) on board of the Solar Dynamics Observatory (SDO) spacecraft corresponding to an average supergranule. Methods. For a steady mass-conserving separable flow model to

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25

Wu, Wei, Hao De Liu, and Wei Gang Zhou. "KF-MA Model for Short-Term Traffic Flow Prediction Based on SCATS Data." Applied Mechanics and Materials 44-47 (December 2010): 3418–22. http://dx.doi.org/10.4028/www.scientific.net/amm.44-47.3418.

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Aimed at the typical problems of lower accuracy and efficiency by using traditional Kalman Filtering (KF) to model the SCATS data, a KF model based on Moving Average (KF-MA) is put forward, that is, to find out the Markov properties of the SCATS data by Moving Average model at first then model the data by Kalman Filtering. Taking the SCATS data in Hang-Zhou as an example, the KF-MA model is compared with the Time Serial (TS) model, the Time Serial model based on Moving Average (TS-MA) and the KF model. The result shows that KF-MA model can maximum elevate the computational efficiency by reduci

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26

Yang, Qing, Zhi Qiang Li, Xing Chen Shao, He Dong, and Yang Yang Tang. "Numerical Investigation of Three-Dimensional Flow over a Swept Backward-Facing Step Using a Multi-Scale Turbulence Model." Applied Mechanics and Materials 444-445 (October 2013): 455–61. http://dx.doi.org/10.4028/www.scientific.net/amm.444-445.455.

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Using a multiscale model based on the variable interval time average method and a set of averaged equations for incompressible turbulent flows, we simulate the three-dimensional separated and reattaching flow over a swept backward-facing step. The results show that the reattachment length and vortex structure vary with the swept angles from 15° to 60° through a detailed study about velocity profile and pressure distribution. Generally the reattachment length and span wise vorticity decrease dramatically after =30°. The result fully accord with experimental data. Results show that this model is

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Xu, Chengcheng, Zhibin Li, and Wei Wang. "SHORT-TERM TRAFFIC FLOW PREDICTION USING A METHODOLOGY BASED ON AUTOREGRESSIVE INTEGRATED MOVING AVERAGE AND GENETIC PROGRAMMING." TRANSPORT 31, no. 3 (2016): 343–58. http://dx.doi.org/10.3846/16484142.2016.1212734.

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The accurate short-term traffic flow forecasting is fundamental to both theoretical and empirical aspects of intelligent transportation systems deployment. This study aimed to develop a simple and effective hybrid model for forecasting traffic volume that combines the AutoRegressive Integrated Moving Average (ARIMA) and the Genetic Programming (GP) models. By combining different models, different aspects of the underlying patterns of traffic flow could be captured. The ARIMA model was used to model the linear component of the traffic flow time series. Then the GP model was applied to capture t

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Liu, Fan, Ying Liu, and Jing Tao Wang. "Estimation of Average Strain Rate during Equal-Channel Angular Pressing." Materials Science Forum 850 (March 2016): 419–25. http://dx.doi.org/10.4028/www.scientific.net/msf.850.419.

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In plastic deformation, the strain rate is a crucial factor to influence the constitutive behavior of materials such as the flow stress evolution, dislocation slipping, and deformation heat generation. In the present work, a formula based on the volume flow rate rule in plastic deformation was proposed to estimate the average strain rate of materials during equal-channel angular pressing (ECAP). It has been found that both the deformation parameters (channel angle Φ, corner angle Ψ, channel width d, and pressing speed v) and material characteristics (strain hardening behavior) can influence th

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29

Hoke, K., A. Landfeld, J. Severa, K. Kýhos, R. Žitný, and M. Houška. "Prediction of the average surface heat transfer coefficient for model foodstuffs in a vertical display cabinet." Czech Journal of Food Sciences 26, No. 3 (2008): 199–210. http://dx.doi.org/10.17221/1590-cjfs.

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Calculations of transient temperatures of food products after they are transferred from a warm environment into a display cabinet, require data on the surface heat transfer coefficient (SHTC). There is no forced air flow in an ordinary display cabinet, so the energy transfer is achieved mainly by free convection, conduction to a supporting plate, and radiation. Theoretical analysis of the heat transfer to a cylindrical sample demonstrates the relative influences of these mechanisms. This work investigates the apparent surface transfer coefficients with metal models. Heated models were placed i

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30

Ma, Zhuangzhuang, Zhangsheng Wu, Tongshu Li, Yu Han, Jian Chen, and Liangpei Zhang. "A Simplified Computational Model for the Location of Depth Average Velocity in a Rectangular Irrigation Channel." Applied Sciences 9, no. 16 (2019): 3222. http://dx.doi.org/10.3390/app9163222.

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Flow measurements in open channels have often utilized velocity-area methods. Thus, estimations of the average velocity in a cross-section of rural canals play an important role in the flow measurement of an irrigation district. This paper derives a model for calculating depth average velocity. This model considers the classical logarithmic formula describing the velocity distribution and flow partitioning theory, which is aimed at finding out a location that represents the depth average velocity (LDAV) along the vertical line from boundary to water surface. Subsequently, the average flow velo

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31

You, Shuang, and Yaping Zhou. "Optimization driven cellular automata for traffic flow prediction at signalized intersections." Journal of Intelligent & Fuzzy Systems 40, no. 1 (2021): 1547–66. http://dx.doi.org/10.3233/jifs-192099.

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The traffic flow prediction using cellular automata (CA) is a trendy research domain that identified the potential of CA in modelling the traffic flow. CA is a technique, which utilizes the basic units for describing the overall behaviour of complicated systems. The CA model poses a benefit for defining the characteristics of traffic flow. This paper proposes a modified CA model to reveal the prediction of traffic flows at the signalised intersection. Based on the CA model, the traffic density and the average speed are computed for studying the characteristics and spatial evolution of traffic

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Wang, Chao, Heyang Yu, Ni Zhan, Xubing Kang, and Jingyu Zhang. "A vibration probe sensor for mass flow rate measurement of gas-solid two-phase flow." Sensor Review 36, no. 2 (2016): 200–206. http://dx.doi.org/10.1108/sr-07-2015-0107.

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Purpose The purpose of this paper is to develop a new vibration probe sensor for measurement of particle mass flow rate in gas–solid two phase flow. Design/methodology/approach A new vibration probe sensor based on polyvinylidene fluoride (PVDF) piezoelectric film is designed. The particle impact model according to Hertz contacting theory is presented. The average amplitude, standard deviation and spectral peak at the natural frequency of the probe (21.2 kHz) of the signals acquired through experiments are chosen as characteristic quantities for further analysis. Findings Through experimental

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Falloon, Pete, Richard Betts, Andrew Wiltshire, et al. "Validation of River Flows in HadGEM1 and HadCM3 with the TRIP River Flow Model." Journal of Hydrometeorology 12, no. 6 (2011): 1157–80. http://dx.doi.org/10.1175/2011jhm1388.1.

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Abstract The Total Runoff Integrating Pathways (TRIP) global river-routing scheme in the third climate configuration of the Met Office Unified Model (HadCM3) and the newer Hadley Centre Global Environmental Model version 1 (HadGEM1) general circulation models (GCMs) have been validated against long-term average measured river discharge data from 40 stations on 24 major river basins from the Global Runoff Data Centre (GRDC). TRIP was driven by runoff produced directly by the two GCMs in order to assess both the skill of river flows produced within GCMs in general and to test this as a method fo

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Meng, Fan Ming, and Yuan Pei Chen. "Initial Pressure Influence on Pressure Flow Factor Used in Mixed-Lubrication Model." Applied Mechanics and Materials 86 (August 2011): 65–69. http://dx.doi.org/10.4028/www.scientific.net/amm.86.65.

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The average flow model proposed by Patir and Cheng offers a great convenience for the mixed-lubrication analysis of rough surfaces. The pressure flow factor introduced by Patir and Cheng helps to analyze the influence of roughness on the average pressure and average flow of a lubricant between surfaces. This paper reports how to reasonably choose initial pressure in computing the pressure flow factor. The numerical results show that the pressure distribution and further pressure flow factor value are sensitive to an initial pressure in solving the pressure flow factor, and the initial pressure

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Ji, Nan, Jie Zhang, and Yan Gao. "A Smooth Flow of Traffic Circle Model." Applied Mechanics and Materials 50-51 (February 2011): 54–58. http://dx.doi.org/10.4028/www.scientific.net/amm.50-51.54.

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This article sets up mathematic model for the traffic circle to determine how best to control traffic flow. In order to make the traffic at the circle intersection smooth in maximum, this model figures out the largest traffic capacity through Wardrop’s formula. When the signal control is needed, a linkage time solving model is set up, which proves the number of seconds of every green light and work out the delay time. At last, the simulation software VISSIM is used for an example to work out the average delay time under the signal control. The result matches with this model.

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Oliveira, T. F., R. B. Miserda, and F. R. Cunha. "Dynamical Simulation and Statistical Analysis of Velocity Fluctuations of a Turbulent Flow behind a Cube." Mathematical Problems in Engineering 2007 (2007): 1–28. http://dx.doi.org/10.1155/2007/24627.

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A statistical approach for the treatment of turbulence data generated by computer simulations is presented. A model for compressible flows at large Reynolds numbers and low Mach numbers is used for simulating a backward-facing step airflow. A scaling analysis has justified the commonly used assumption that the internal energy transport due to turbulent velocity fluctuations and the work done by the pressure field are the only relevant mechanisms needed to model subgrid-scale flows. From the numerical simulations, the temporal series of velocities are collected for ten different positions in th

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Banihabib, Mohammad Ebrahim, Lubos Jurik, Mahsa Sheikh Kazemi, Jaber Soltani, and Mitra Tanhapour. "A Hybrid Intelligence Model for the Prediction of the Peak Flow of Debris Floods." Water 12, no. 8 (2020): 2246. http://dx.doi.org/10.3390/w12082246.

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Debris floods, as one of the most significant natural hazards, often threaten the lives and property of many people worldwide. Predicting models are essential for flood warning systems to minimize casualties of debris floods. Since HEC-HMS (Hydrologic Engineering Center’s Hydrological Modelling System) cannot simulate debris flow, this study proposes a new hybrid model that uses artificial intelligence models to overcome HEC-HMS’s insufficiency in reflecting the sediment concentration effect on the debris floods. A sediment concentration is an effective factor for evaluating debris flood peak

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Lichtzinder, Boris Ya, Igor A. Blatov, and Elena V. Kitaeva. "ON ESTIMATES OF THE AVERAGE QUEUE LENGTH FOR MASS SERVICE SYSTEMS IN CASE OF CORRELATED INPUT FLOW." T-Comm 14, no. 8 (2020): 13–20. http://dx.doi.org/10.36724/2072-8735-2020-14-8-13-20.

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In multiservice packet-switched networks, the packet flow differs significantly from the Poisson flow, since these flows are generated by many sources of requests for services that are significantly different from each other. All this leads to the fact that the flows in multiservice networks are characterized by uneven arrival of requests and packets. Packages are grouped into "bundles" at some time intervals and are practically absent at other intervals. The random process of claims (packets) entering the system is characterized by a distribution law that establishes a relationship between th

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Dong, He, Ge Gao, Zhi Qiang Li, Yang Yang Tang, Huan Xu, and Jian Guo. "Numerical Investigation of Flow around a Triangle Cylinder Using a Multiscale Turbulence Model." Applied Mechanics and Materials 444-445 (October 2013): 253–58. http://dx.doi.org/10.4028/www.scientific.net/amm.444-445.253.

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The unsteady flow around a triangle cylinder was simulated using the multiscale turbulence model based on the variable interval time average method. The numerical method used in this simulation is an unstructured staggered mesh scheme. The computational results show that the multiscale turbulence model can successfully simulate vortex shedding characteristics. The Strouhal number and time-averaged velocity profiles also agree better with experiments than that of the standard k-ε model.

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Frooqnia, Amir, Carlos Torres-Verdín, Kamy Sepehrnoori, and Rohollah Abdhollah-Pour. "Transient Coupled Borehole/Formation Fluid-Flow Model for Interpretation of Oil/Water Production Logs." SPE Journal 22, no. 01 (2016): 389–406. http://dx.doi.org/10.2118/183628-pa.

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Summary Interpretation of two-phase production logs (PLs) traditionally constructs borehole fluid-flow models decoupled from the physics of reservoir rocks. However, quantifying formation dynamic petrophysical properties from PLs requires simultaneous modeling of both borehole and formation fluid-flow phenomena. This paper develops a novel transient borehole/formation fluid-flow model that allows quantification of the effect of formation petrophysical properties on measurements acquired with production-logging tools (PLTs). We invoke a 1D, isothermal, two-fluid formulation to simulate borehole

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Yuan, Youquan, Yinghan Huang, Jingjie Feng, Ran Li, Ruidong An, and Juping Huang. "Numerical Model of Supersaturated Total Dissolved Gas Dissipation in a Channel with Vegetation." Water 10, no. 12 (2018): 1769. http://dx.doi.org/10.3390/w10121769.

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The recent construction and operation of high dams have greatly changed the natural flood process. To meet the ecological demands and flood control requirements of rivers, dams discharge flow through the flood discharge facility, always accompanied by total dissolved gas (TDG) supersaturation in the water, which is harmful to fish. The purpose of this paper is to explore the dissipation characteristics and prediction methods of supersaturated TDG in water flowing through a floodplain covered with vegetation. A three-dimensional two-phase supersaturated TDG transportation and dissipation model

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Birch, A. C., H. Schunker, D. C. Braun, and L. Gizon. "Average surface flows before the formation of solar active regions and their relationship to the supergranulation pattern." Astronomy & Astrophysics 628 (August 2019): A37. http://dx.doi.org/10.1051/0004-6361/201935591.

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Context. The emergence of solar active regions is an important but poorly understood aspect of the solar dynamo. Aims. Knowledge of the flows associated with the rise of active-region-forming magnetic concentrations through the near-surface layers will help determine the mechanisms of active region formation. Methods. We used helioseismic holography and granulation tracking to measure the horizontal flows at the surface that precede the emergence of active regions. We then averaged these flows over about sixty emerging active regions to reduce the noise, selecting active regions that emerge in

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Back, L. H., Y. I. Cho, and D. W. Crawford. "Phasic and Spatial Pressure Measurements in a Femoral Artery Branch Model for Pulsatile Flow." Journal of Biomechanical Engineering 108, no. 3 (1986): 251–58. http://dx.doi.org/10.1115/1.3138611.

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Phasic and spatial time-averaged pressure distributions were measured in a 60-deg femoral artery branch model over a large range of branch flow ratios and at physiological Reynolds numbers of about 120 and 700. The results obtained with an in-vivolike flow wave form indicated spatial adverse time average pressure gradients in the branch vicinity which increased in magnitude with branch flow ratio, and the importance of the larger inertial effects at the higher Reynolds numbers. Pressure losses in the branch entrance region were relatively large, and corresponding flow resistances may limit bra

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Ta, C. T., J. Beckley, and A. Eades. "A multiphase CFD model of DAF process." Water Science and Technology 43, no. 8 (2001): 153–57. http://dx.doi.org/10.2166/wst.2001.0488.

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A Eulerian-Eulerian multiphase CFD model is employed for the air/water flow. A 3D structure grid is used to incorporate the air nozzle and tank geometry. The fixed frictionless wall boundary approximating the free surface acts as a sink to allow the air bubbles to escape. The air/water volume fraction in the flotation tank is evaluated to determine the effective air/water fluid density. The floc particle is then introduced and is tracked in the air/water fluid using a disperse Lagrangean model. Fate of these flocs depends on their sizes and density. Flocs therefore can either escape through th

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Liu, Jing Yuan, and Wen Qiang Cheng. "An Improved Shear Stress Transport(SST) Model for High Speed Flows." Applied Mechanics and Materials 229-231 (November 2012): 625–29. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.625.

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An improved Shear Stress Transport(SST) model, which allows for the compressible corrections, is proposed in this study. Numerical scheme was established by taking advantage of the improved Total Variation Diminishing (TVD) scheme and by applying implicit scheme to the negative source terms of the turbulence model. Hypersonic flat-plate boundary-layer flows and hypersonic compression ramp flows marked with separation, reattachment and shock/boundary-layer interactions are then computed. The comparisons between the computational results, the experimental results and the semi-empirical formulati

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Chen, Rongchuang, Jiao Zeng, Guichuan Yao, and Fei Feng. "Flow-Stress Model of 300M Steel for Multi-Pass Compression." Metals 10, no. 4 (2020): 438. http://dx.doi.org/10.3390/met10040438.

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In this work, multi-pass compressions were performed at various strain rates (0.01 s−1, 0.1 s−1, 1 s−1, 10 s−1), temperatures (950 °C, 1050 °C, 1150 °C), inter-pass holding time (1 s, 10 s, 30 s, 120 s, 600 s), interrupt strains (0.3, 0.4, 0.5, 0.6), and total pass numbers (1, 2, 3, 4). The intriguing finding was that the recrystallized fraction, average dislocation density, and plastic cumulative strain were partly eliminated during inter-pass holding, resulting in the early occurrence of recrystallization in subsequent compression. Therefore, a parameter (Θ) to evaluate the overall softening

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Caetano, E. F., O. Shoham, and J. P. Brill. "Upward Vertical Two-Phase Flow Through an Annulus—Part II: Modeling Bubble, Slug, and Annular Flow." Journal of Energy Resources Technology 114, no. 1 (1992): 14–30. http://dx.doi.org/10.1115/1.2905916.

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Mechanistic models have been developed for each of the existing two-phase flow patterns in an annulus, namely bubble flow, dispersed bubble flow, slug flow, and annular flow. These models are based on two-phase flow physical phenomena and incorporate annulus characteristics such as casing and tubing diameters and degree of eccentricity. The models also apply the new predictive means for friction factor and Taylor bubble rise velocity presented in Part I. Given a set of flow conditions, the existing flow pattern in the system can be predicted. The developed models are applied next for predictin

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Cruz, Josias da Silva, Claudio José Cavalcante Blanco, and Antônio César Pinho Brasil Junior. "Flow-velocity model for hydrokinetic energy availability assessment in the Amazon." Acta Scientiarum. Technology 42 (November 29, 2019): e45703. http://dx.doi.org/10.4025/actascitechnol.v42i1.45703.

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The Brazilian hydrological information network does not provide data series of daily velocities. The river velocities are important for the study of hydrokinetic potential. Therefore, the work proposes a model called flow-velocity that estimates the average daily velocity and the distribution of the velocity profile of the cross section of rivers. The model was applied to the Amazon basin, using the highest and lowest flow rates of the historical series. The highest and lowest average velocities found in the Amazon River were 2.27 m s-1 and 0.735 m s-1, respectively. The main contributors to t

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Gao, Chao, Jinliang Xu, Xingli Jia, Yaping Dong, and Han Ru. "Influence of Large Vehicles on the Speed of Expressway Traffic Flow." Advances in Civil Engineering 2020 (January 8, 2020): 1–9. http://dx.doi.org/10.1155/2020/2454106.

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Large vehicles impact the quality of traffic flow. To predict the impact of large-scale vehicles on the average speed of traffic flow, vehicle speeds under different vehicle mixing rates were collected through field observations. A laser roadside traffic survey instrument with automatic vehicle type identification functionality was used to collect cross section traffic flow data. The v/C ratio, large vehicle mixing rate, and average speed of traffic were calculated for each data set. A total of 158 traffic flow data sets were captured and divided into three groups according to the v/C ratio of

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Kang, Yi-rong, Di-hua Sun, and Shu-hong Yang. "A New Macro Model Considering the Average Speed of Preceding Vehicles Group in CPS Environment." Mathematical Problems in Engineering 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/960630.

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A new car following model considering the effect of average speed information of preceding vehicles group in real traffic is presented. Based on the new car following model, a new macro model for traffic flow is proposed employing the relationship between the micro and macro variables. The linear stability condition of the macro model is obtained by using the linear stability theory. The numerical tests show that the new model can not only simulate the dynamic process of shock, rarefaction wave, and small perturbation, but also can further stabilize the traffic flow.

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