Relevant bibliographies by topics / Time-varying flow

Academic literature on the topic 'Time-varying flow'

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Published: 4 June 2021
Last updated: 20 February 2023

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Journal articles on the topic "Time-varying flow"

1

Egger, Joseph. "Time varying flow over mountains: temperature perturbations at the surface." Meteorologische Zeitschrift 18, no. 1 (March 6, 2009): 101–6. http://dx.doi.org/10.1127/0941-2948/2009/352.

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Cai, X., D. Sha, and C. K. Wong. "Time-varying minimum cost flow problems." European Journal of Operational Research 131, no. 2 (June 2001): 352–74. http://dx.doi.org/10.1016/s0377-2217(00)00059-x.

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Cai, X., D. Sha, and C. K. Wong. "Time-varying universal maximum flow problems." Mathematical and Computer Modelling 33, no. 4-5 (February 2001): 407–30. http://dx.doi.org/10.1016/s0895-7177(00)00252-1.

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Aung Kyaw, NyoNyo, and Sijing Zong. "The Time-varying Cash Flow Sensitivity of Cash." Journal of International Business and Economy 15, no. 2 (December 1, 2014): 1–34. http://dx.doi.org/10.51240/jibe.2014.2.1.

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By using data of US manufacturing companies, we revisit the cash flow sensitivity to cash in two sub-samples of 1993-2000 and 2000-2011 to investigate the time-varying features of the cash flow sensitivity of cash. Our results show a weakening coefficient of US manufacturing firms from 1990s to 2000s. The sensitivity in the later time period is only a half of its original scale. Financially unconstrained firms seem to converge with the constrained firms in the later period, leading to the conclusion that macroeconomic conditions impact more on the cash flow sensitivity of cash than the external financial constraint does. Further, our research identifies that the overall decreasing sensitivity is driven by firms with negative cash flows.
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Evcin, Cansu, Ömür Uğur, and Münevver Tezer-Sezgin. "Time varying control of magnetohydrodynamic duct flow." European Journal of Mechanics - B/Fluids 89 (September 2021): 100–114. http://dx.doi.org/10.1016/j.euromechflu.2021.05.007.

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Amgain, Dipak Babu, and Tanka Nath Dhamala. "Quickest Flow Algorithms with Time-Varying Attributes." Journal of Institute of Science and Technology 26, no. 1 (June 17, 2021): 63–73. http://dx.doi.org/10.3126/jist.v26i1.37826.

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In many real-world situations, there are numerous network optimization problems where the network attributes depend on time. In this paper, we consider single-source single-sink discrete-time dynamic network flow problems. We review some algorithms for the quickest flow problems in two environments (to the network attributes): time-invariant and time-variant. This paper mainly focuses on the existing algorithms for a later one. In literature, most of the authors have made their objectives to determine the earliest arrival time paths along which a given amount of flow can be sent in the minimum time. Evacuation is the most recent research area of network optimization, where quickest flow models allow the estimation of the minimum time required to bring a given number of evacuees to safety.
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FKIRIN, M. A. "On-line time-varying river-flow prediction." International Journal of Systems Science 20, no. 7 (July 1989): 1227–32. http://dx.doi.org/10.1080/00207728908910208.

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Nasrabadi, Ebrahim, and S. Mehdi Hashemi. "Minimum cost time-varying network flow problems." Optimization Methods and Software 25, no. 3 (June 2010): 429–47. http://dx.doi.org/10.1080/10556780903239121.

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Styrman, Avril. "Relativity vs. absolute simultaneity: Varying flow of time or varying frequency?" Physics Essays 31, no. 3 (September 1, 2018): 256–64. http://dx.doi.org/10.4006/0836-1398-31.3.256.

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Hyrkas, Jeremy, Daniel Halperin, and Bill Howe. "Time-Varying Clusters in Large-Scale Flow Cytometry." Proceedings of the AAAI Conference on Artificial Intelligence 29, no. 2 (January 25, 2015): 4022–23. http://dx.doi.org/10.1609/aaai.v29i2.19067.

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Flow cytometers measure the optical properties of particles to classify microbes. Recent innovations have allowed oceanographers to collect flow cytometry data continuously during research cruises, leading to an explosion of data and new challenges for the classification task. The massive scale, time-varying underlying populations, and noisy measurements motivate the development of new classification methods. We describe the problem, the data, and some preliminary results demonstrating the difficulty with conventional methods.
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Dissertations / Theses on the topic "Time-varying flow"

1

Raben, Samuel Gillooly. "Determination of Three Dimensional Time Varying Flow Structures." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/51818.

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Time varying flow structures are involved in a large percentage of fluid flows although there is still much unknown regarding their behavior. With the development of high spatiotemporal resolution measurement systems it is becoming more feasible to measure these complex flow structures, which in turn will lead to a better understanding of their impact. One method that has been developed for studying these flow structures is finite time Lyapunov exponents (FTLEs). These exponents can reveal regions in the fluid, referred to as Lagragnian coherent structures (LCSs), where fluid elements diverge or attract. Better knowledge of how these time varying structures behave can greatly impact a wide range of applications, from aircraft design and performance, to an improved understanding of mixing and transport in the human body. This work provides the development of new methodologies for measuring and studying three-dimensional time varying structures. Provided herein is a method to improve replacement of erroneous measurements in particle image velocimetry data, which leads to increased accuracy in the data. Also, a method for directly measuring the finite time Lyapunov exponents from particle images is developed, as well as an experimental demonstration in a three-dimensional flow field. This method takes advantage of the information inherently contained in these images to improve accuracy and reduce computational requirements. Lastly, this work provides an in depth look at the flow field for developing wall jets across a wide range of Reynolds numbers investigating the mechanisms that contribute to their development.
Ph. D.
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Chen, Chun-Ming. "Data Summarization for Large Time-varying Flow Visualization and Analysis." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1469141137.

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Festger, Adam Douglas. "Analysis of hydraulic capture zones and efficiency under time-varying flow and pumping conditions." Thesis, The University of Arizona, 2000. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_e9791_2000_30_sip1_w.pdf&type=application/pdf.

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van, Mierlo Tim, and Rafal Żywalewski. "Evaluation of time varying stresses in a Howden fan." Thesis, Linnéuniversitetet, Institutionen för maskinteknik (MT), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-43752.

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In this work, the time varying stresses in a Howden axial flow fan are obtained by finite element analyses. Dynamic substructuring is used to obtain accurate values of the stresses in the threads of the blade shaft, the component which connects the blade with the hub. Three different global models are used to compare the influence of neglecting the fan shaft and the stiffness influence of the centrifugal force. The relative displacements, which are obtained from the global models, have been used as boundary condition in the detailed models. The detailed models are used to obtain the Von Mises stresses in the root of the threads of the blade shaft. Finally the results of the three global models are compared with experimental measured data provided by Howden. The experimental data results in the highest Von Mises stresses. The model with the fan shaft and the stiffness influence of the centrifugal force gives values for the Von Mises stresses which are approximately twenty percent lower. The model without the fan shaft results in the lowest stresses which are approximately forty percent lower than the stresses obtained using the measured data.
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Zigic, Sasha, and n/a. "A Methodology to Calculate the Time-Varying Flow Through a Hydraulic Structure Connecting Two Water Bodies." Griffith University. School of Engineering, 2005. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20060111.145655.

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Hydraulic lock structures have been used for hundreds of years to control and maintain water levels in waterways. The most common are gated water regulation structures used to catch and divert water, and form an essential and critical part of many flood control and agricultural schemes. Although there are clear economic advantages to building the structures, they can contribute to major water quality problems for the waterways they influence (i.e. increased residence times and a change in mixing ability). Further, in most cases, the methods previously used to assess how the structures and their operations influence the flow regimes between the two connected systems were limited, thus hydraulic designers rely on simple formulations, existing literature and experience. Consequently, the objectives of this thesis were to undertake a detailed field study and develop a methodology and computer simulation tool to calculate the flow through a hydraulic structure connecting two water bodies so that future designs can be undertaken based upon sound knowledge. To demonstrate the outcomes of this thesis, the methodology and model were applied to an existing hydraulic structure (referred to as Structure C). Structure C is used to connect and exchange water between the tidally dominated section of the Nerang River estuary and an artificial lake system (Burleigh Lakes) on the Gold Coast, Australia. The gates of this structure open four times each day (once during each semi-diurnal tidal phase) and remain open for a period of 2 hours, allowing alternative and partial exchange between the two water bodies. To gain a better understanding of the dynamics of each waterbody under the influence of the structure, a series of detailed field experiments were initially undertaken to understand and quantify the exchange of water and its mixing ability. Tide gauges deployed within the lake indicated a water level change during each opening of up to 22 cm, equating to 413,600 m3 of water entering the lake over the 2 hour discharge period. Salinity profiles showed that the structure permitted the exchange of saline and freshwater between the two systems, during each tidal cycle, in turn maintaining the lake system as a saline (brackish environment). However, the field study also revealed that the controlled exchange of water between the systems perpetuated a permanently stratified environment on both sides of the structure. To simulate the flow dynamics influenced by Structure C, new routines were incorporated into an existing hydrodynamic model (BFHYDRO) within the model's grid and computational code, as part of this thesis. To achieve this, the flow in and out of the hydraulic structure cell (used to represent the hydraulic structure's location within the model grid) was calculated entirely from the local water level gradients on either side of the structure at each time-step, and not prescribed. This was found to be essential for complex tidally-dominated systems, such as the Nerang River. Routines were also developed to replicate the opening and closing times of the gates. Following the development of the methodology, the hydraulic structure cells were tested and applied to simulate the flow through Structure C and the complex exchange between the estuary and lake, in 2 and 3-dimensions. Tests indicated that the opening and closing times of the gates and the calibration of the discharge coefficient (which forms part of the broad-crested weir formula) were the most sensitive parameters to ensure the correct volume of water exchange between the two systems. Statistically, the model-predicted results compared very well with available surface elevation data within the estuary and lake, and thus, quantified the ability of the hydraulic structure cells to simulate the flux between the estuary and lake for each opening. Following the model validation process, results from the existing configuration were compared with hypothetical design alternatives and are documented herein. Further, part of the thesis also explored a practical and effective computer based learning strategy to introduce and teach hydrodynamic and water quality modelling, to the next generation of undergraduate engineering students. To enhance technology transfer a computer based instructional (CBI) aid was specifically developed to assist with the setup, execution and the analysis of models' output, in small easy steps. The CBI aid comprised of a HTML module with links to recorded Lotus Screen cam movie clips. The strategy proved to be a useful and effective approach in assisting the students to complete the project with minimum supervision, and acquire a basic understanding of water quality modelling. Finally, it is anticipated that this new modelling capability and the findings detailed herein will provide managers with a valuable tool to assess the influence of these structures on water circulation for present and future operations within the region. This model can also be set up at other sites to pre-assess various design configurations by predicting changes in current flows, mixing and flushing dynamics that a particular design might achieve, and assist with the selection process before the final selection and construction.
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Zigic, Sasha. "A Methodology to Calculate the Time-Varying Flow Through a Hydraulic Structure Connecting Two Water Bodies." Thesis, Griffith University, 2005. http://hdl.handle.net/10072/365304.

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Hydraulic lock structures have been used for hundreds of years to control and maintain water levels in waterways. The most common are gated water regulation structures used to catch and divert water, and form an essential and critical part of many flood control and agricultural schemes. Although there are clear economic advantages to building the structures, they can contribute to major water quality problems for the waterways they influence (i.e. increased residence times and a change in mixing ability). Further, in most cases, the methods previously used to assess how the structures and their operations influence the flow regimes between the two connected systems were limited, thus hydraulic designers rely on simple formulations, existing literature and experience. Consequently, the objectives of this thesis were to undertake a detailed field study and develop a methodology and computer simulation tool to calculate the flow through a hydraulic structure connecting two water bodies so that future designs can be undertaken based upon sound knowledge. To demonstrate the outcomes of this thesis, the methodology and model were applied to an existing hydraulic structure (referred to as Structure C). Structure C is used to connect and exchange water between the tidally dominated section of the Nerang River estuary and an artificial lake system (Burleigh Lakes) on the Gold Coast, Australia. The gates of this structure open four times each day (once during each semi-diurnal tidal phase) and remain open for a period of 2 hours, allowing alternative and partial exchange between the two water bodies. To gain a better understanding of the dynamics of each waterbody under the influence of the structure, a series of detailed field experiments were initially undertaken to understand and quantify the exchange of water and its mixing ability. Tide gauges deployed within the lake indicated a water level change during each opening of up to 22 cm, equating to 413,600 m3 of water entering the lake over the 2 hour discharge period. Salinity profiles showed that the structure permitted the exchange of saline and freshwater between the two systems, during each tidal cycle, in turn maintaining the lake system as a saline (brackish environment). However, the field study also revealed that the controlled exchange of water between the systems perpetuated a permanently stratified environment on both sides of the structure. To simulate the flow dynamics influenced by Structure C, new routines were incorporated into an existing hydrodynamic model (BFHYDRO) within the model's grid and computational code, as part of this thesis. To achieve this, the flow in and out of the hydraulic structure cell (used to represent the hydraulic structure's location within the model grid) was calculated entirely from the local water level gradients on either side of the structure at each time-step, and not prescribed. This was found to be essential for complex tidally-dominated systems, such as the Nerang River. Routines were also developed to replicate the opening and closing times of the gates. Following the development of the methodology, the hydraulic structure cells were tested and applied to simulate the flow through Structure C and the complex exchange between the estuary and lake, in 2 and 3-dimensions. Tests indicated that the opening and closing times of the gates and the calibration of the discharge coefficient (which forms part of the broad-crested weir formula) were the most sensitive parameters to ensure the correct volume of water exchange between the two systems. Statistically, the model-predicted results compared very well with available surface elevation data within the estuary and lake, and thus, quantified the ability of the hydraulic structure cells to simulate the flux between the estuary and lake for each opening. Following the model validation process, results from the existing configuration were compared with hypothetical design alternatives and are documented herein. Further, part of the thesis also explored a practical and effective computer based learning strategy to introduce and teach hydrodynamic and water quality modelling, to the next generation of undergraduate engineering students. To enhance technology transfer a computer based instructional (CBI) aid was specifically developed to assist with the setup, execution and the analysis of models' output, in small easy steps. The CBI aid comprised of a HTML module with links to recorded Lotus Screen cam movie clips. The strategy proved to be a useful and effective approach in assisting the students to complete the project with minimum supervision, and acquire a basic understanding of water quality modelling. Finally, it is anticipated that this new modelling capability and the findings detailed herein will provide managers with a valuable tool to assess the influence of these structures on water circulation for present and future operations within the region. This model can also be set up at other sites to pre-assess various design configurations by predicting changes in current flows, mixing and flushing dynamics that a particular design might achieve, and assist with the selection process before the final selection and construction.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Engineering
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QUET, Pierre-Francois D. "A ROBUST CONTROL THEORETIC APPROACH TO FLOW CONTROLLER DESIGNS FOR CONGESTION CONTROL IN COMMUNICATION NETWORKS." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1032194223.

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Kim, Minseok, Luke A. Pangle, Charléne Cardoso, Marco Lora, Till H. M. Volkmann, Yadi Wang, Ciaran J. Harman, and Peter A. Troch. "Transit time distributions and StorAge Selection functions in a sloping soil lysimeter with time-varying flow paths: Direct observation of internal and external transport variability." AMER GEOPHYSICAL UNION, 2016. http://hdl.handle.net/10150/622147.

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Transit times through hydrologic systems vary in time, but the nature of that variability is not well understood. Transit times variability was investigated in a 1 m(3) sloping lysimeter, representing a simplified model of a hillslope receiving periodic rainfall events for 28 days. Tracer tests were conducted using an experimental protocol that allows time-variable transit time distributions (TTDs) to be calculated from data. Observed TTDs varied with the storage state of the system, and the history of inflows and outflows. We propose that the observed time variability of the TTDs can be decomposed into two parts: internal variability associated with changes in the arrangement of, and partitioning between, flow pathways; and external variability driven by fluctuations in the flow rate along all flow pathways. These concepts can be defined quantitatively in terms of rank StorAge Selection (rSAS) functions, which is a theory describing lumped transport dynamics. Internal variability is associated with temporal variability in the rSAS function, while external is not. The rSAS function variability was characterized by an inverse storage effect, whereby younger water is released in greater proportion under wetter conditions than drier. We hypothesize that this effect is caused by the rapid mobilization of water in the unsaturated zone by the rising water table. Common approximations used to model transport dynamics that neglect internal variability were unable to reproduce the observed breakthrough curves accurately. This suggests that internal variability can play an important role in hydrologic transport dynamics, with implications for field data interpretation and modeling.
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Lee, Teng-Yok. "Data Triage and Visual Analytics for Scientific Visualization." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1321889683.

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Zhang, Caixia. "Advanced volume rendering." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1143150322.

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Books on the topic "Time-varying flow"

1

Ang, Andrew. How to discount cashflow with time-varying expected returns. Cambridge, Mass: National Bureau of Economic Research, 2003.

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Gelbard, Fred. Modeling one-dimensional radionuclide transport under time-varying fluid-flow conditions. Washington, DC: Division of Engineering, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1989.

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Gelbard, Fred. Modeling one-dimensional radionuclide transport under time-varying fluid-flow conditions. Washington, DC: Division of Engineering, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1989.

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Gelbard, Fred. Modeling one-dimensional radionuclide transport under time-varying fluid-flow conditions. Washington, D.C: Division of Engineering, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1989.

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Merritt, Michael L. Computation of the time-varying flow rate from an artesian well in central Dade County, Florida, by analytical and numerical simulation methods. Tallahasssee, Fla: U.S. Dept. of the Interior, U.S. Geological Survey, 1995.

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Merritt, Michael L. Computation of the time-varying flow rate from an artesian well in central Dade County, Florida, by analytical and numerical simulation methods. Tallahasssee, Fla: U.S. Dept. of the Interior, U.S. Geological Survey, 1995.

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Merritt, Michael L. Computation of the time-varying flow rate from an artesian well in central Dade County, Florida, by analytical and numerical simulation methods. Tallahasssee, Fla: U.S. Dept. of the Interior, U.S. Geological Survey, 1995.

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Merritt, Michael L. Computation of the time-varying flow rate from an artesian well in central Dade County, Florida, by analytical and numerical simulation methods. Tallahasssee, Fla: U.S. Dept. of the Interior, U.S. Geological Survey, 1995.

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Merritt, Michael L. Computation of the time-varying flow rate from an artesian well in central Dade County, Florida, by analytical and numerical simulation methods. Washington: U.S. G.P.O., 1997.

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Merritt, Michael L. Computation of the time-varying flow rate from an artesian well in central Dade County, Florida, by analytical and numerical simulation methods. Tallahasssee, Fla: U.S. Dept. of the Interior, U.S. Geological Survey, 1995.

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Book chapters on the topic "Time-varying flow"

1

Streett, C. L., and M. Y. Hussaini. "Finite Length Taylor Couette Flow." In Stability of Time Dependent and Spatially Varying Flows, 312–34. New York, NY: Springer New York, 1987. http://dx.doi.org/10.1007/978-1-4612-4724-1_17.

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Sha, D., X. Cai, and C. K. Wong. "The Maximum Flow in a Time-Varying Network." In Lecture Notes in Economics and Mathematical Systems, 437–56. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-57014-8_29.

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Bushnell, D. M., and M. R. Malik. "Application of Stability Theory to Laminar Flow Control—Progress and Requirements." In Stability of Time Dependent and Spatially Varying Flows, 1–17. New York, NY: Springer New York, 1987. http://dx.doi.org/10.1007/978-1-4612-4724-1_1.

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Bodonyi, R. J., and F. T. Smith. "On Short-Scale Inviscid Instabilities in the Flow Past Surface-Mounted Obstacles." In Stability of Time Dependent and Spatially Varying Flows, 148–63. New York, NY: Springer New York, 1987. http://dx.doi.org/10.1007/978-1-4612-4724-1_8.

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Kleinsteuber, Martin, and Simon Hawe. "A Discretized Newton Flow for Time-Varying Linear Inverse Problems." In Springer Proceedings in Mathematics & Statistics, 99–110. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-5076-4_7.

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Hamilton, Howard H., Andrew J. Kurdila, and Anand K. Jammulamadaka. "A Switched Reduced-Order Dynamical System for Fluid Flows under Time-Varying Flow Conditions." In IUTAM Symposium on Flow Control and MEMS, 349–52. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6858-4_41.

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Hamill, Les. "Flow under a varying head — time required to empty a reservoir." In Understanding Hydraulics, 209–24. London: Macmillan Education UK, 2011. http://dx.doi.org/10.1007/978-0-230-34586-7_7.

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Xu, Yuedong, Liang Wang, Zhihong Guan, and Hua O. Wang. "Global Stability of Optimization Based Flow Control with Time-Varying Delays." In Parallel and Distributed Computing: Applications and Technologies, 326–31. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-30501-9_69.

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Hamill, Les. "Flow Under a Varying Head — Time Required to Empty a Reservoir." In Understanding Hydraulics, 197–213. London: Macmillan Education UK, 1995. http://dx.doi.org/10.1007/978-1-349-13296-6_7.

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Agranovsky, Alexy, Harald Obermaier, and Kenneth I. Joy. "A Framework for the Visualization of Finite-Time Continuum Mechanics Effects in Time-Varying Flow." In Advances in Visual Computing, 349–60. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-41939-3_34.

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Conference papers on the topic "Time-varying flow"

1

Varwandkar, S. D., Pragati P. Gupta, and M. V. Hariharan. "Load flow with time varying injections." In 2016 19th National Power Systems Conference (NPSC). IEEE, 2016. http://dx.doi.org/10.1109/npsc.2016.7858884.

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Vintr, Tomas, Maria Stachova, Achim J. Lilienthal, Tomas Krajnik, Sergi Molina, Ransalu Senanayake, George Broughton, et al. "Time-varying Pedestrian Flow Models for Service Robots." In 2019 European Conference on Mobile Robots (ECMR). IEEE, 2019. http://dx.doi.org/10.1109/ecmr.2019.8870909.

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Smith, T. M. A., D. Redmill, N. Canagarajah, and D. Bull. "Time Varying Volumetric Scene Reconstruction Using Scene Flow." In British Machine Vision Conference 2007. British Machine Vision Association, 2007. http://dx.doi.org/10.5244/c.21.81.

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Chang, Dongsik, and Fumin Zhang. "Distributed motion tomography for time-varying flow fields." In OCEANS 2016 - Shanghai. IEEE, 2016. http://dx.doi.org/10.1109/oceansap.2016.7485540.

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Tang, Yujie, and Steven Low. "Distributed algorithm for time-varying optimal power flow." In 2017 IEEE 56th Annual Conference on Decision and Control (CDC). IEEE, 2017. http://dx.doi.org/10.1109/cdc.2017.8264138.

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Tadmor, Gilead, Danieel Bissex, Bernd Noack, Marek Morzynski, Tim Colonius, and Kunihiko Taira. "Fast Approximated POD for a Flat Plate Benchmark with a Time Varying Angle of Attack." In 4th Flow Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-4191.

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Briers, J. D. "Time-varying laser speckle for measuring motion and flow." In Saratov Fall Meeting 2000, edited by Dmitry A. Zimnyakov. SPIE, 2001. http://dx.doi.org/10.1117/12.427758.

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Song, Wei, Chaomin Huang, and Beisi Jiang. "Visual methods for time-varying intersection traffic flow data." In 2017 4th International Conference on Systems and Informatics (ICSAI). IEEE, 2017. http://dx.doi.org/10.1109/icsai.2017.8248568.

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Abraham, J. P., E. M. Sparrow, J. C. K. Tong, and W. J. Minkowycz. "Intermittent Flow Modeling: Part 2—Time-Varying Flows and Flows in Variable Area Ducts." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22696.

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The all-flow-regime model of fluid flow, previously applied in [1] to flows with axially and temporally uniform Reynolds numbers, has been implemented here for flows in which the Reynolds number may either vary with time or along the length of a pipe. In the former situation, the timewise variations were driven by a harmonically oscillating inlet flow. These oscillations created a succession of flow-regime transitions encompassing purely laminar and purely turbulent flows as well as laminarizing and turbulentizing flows where intermittency prevailed. The period of the oscillations was increased parametrically until the quasi-steady regime was attained. The predicted quasi-steady friction factors were found to be in excellent agreement with those from a simple model under which the flow is assumed to pass through a sequence of instantaneous steady states. In the second category of non-constant-Reynolds-number flows, axial variations of a steady flow were created by means of a finite-length conical enlargement which connected a pair of pipes of constant but different diameters. The presence of the cross-sectional enlargement gives rise to a reduction of the Reynolds number that is proportional to the ratio of the diameters of the upstream and the downstream pipes. Depending on the magnitude of the upstream inlet Reynolds number, the downstream fully developed flow could variously be laminar, intermittent, or turbulent. The presence or absence of flow separation in the conical enlargement had a direct effect on the laminarization process. For both categories of non-constant-Reynolds-number flows, laminarization and turbulentization were quantified by the ratio of the rate of turbulence production to the rate of turbulence destruction.
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Jou, Yow-Jen, Chien-Lun Lan, George Maroulis, and Theodore E. Simos. "Path Flow Estimation Using Time Varying Coefficient State Space Model." In COMPUTATIONAL METHODS IN SCIENCE AND ENGINEERING: Advances in Computational Science: Lectures presented at the International Conference on Computational Methods in Sciences and Engineering 2008 (ICCMSE 2008). AIP, 2009. http://dx.doi.org/10.1063/1.3225358.

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Reports on the topic "Time-varying flow"

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Matei, Ion, Assane Gueye, and John S. Baras. Flow Control in Time-Varying, Random Supply Chains. Gaithersburg, MD: National Institute of Standards and Technology, January 2013. http://dx.doi.org/10.6028/nist.ir.7907.

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Kularatne, Dhanushka N., Subhrajit Bhattacharya, and M. Ani Hsieh. Computing Energy Optimal Paths in Time-Varying Flows. Drexel University, 2016. http://dx.doi.org/10.17918/d8b66v.

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Autonomous marine vehicles (AMVs) are typically deployed for long periods of time in the ocean to monitor different physical, chemical, and biological processes. Given their limited energy budgets, it makes sense to consider motion plans that leverage the dynamics of the surrounding flow field so as to minimize energy usage for these vehicles. In this paper, we present two graph search based methods to compute energy optimal paths for AMVs in two-dimensional (2-D) time-varying flows. The novelty of the proposed algorithms lies in a unique discrete graph representation of the 3-D configuration space spanned by the spatio-temporal coordinates. This enables a more efficient traversal through the search space, as opposed to a full search of the spatio-temporal configuration space. Furthermore, the proposed strategy results in solutions that are closer to the global optimal when compared to greedy searches through the spatial coordinates alone. We demonstrate the proposed algorithms by computing optimal energy paths around the Channel Islands in the Santa Barbara bay using time-varying flow field forecasts generated by the Regional Ocean Model System. We verify the accuracy of the computed paths by comparing them with paths computed via an optimal control formulation.
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Gelbard, F. Modeling one-dimensional radionuclide transport under time-varying fluid-flow conditions. Office of Scientific and Technical Information (OSTI), November 1989. http://dx.doi.org/10.2172/5450172.

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McKinnon, Mark, Craig Weinschenk, and Daniel Madrzykowski. Modeling Gas Burner Fires in Ranch and Colonial Style Structures. UL Firefighter Safety Research Institute, June 2020. http://dx.doi.org/10.54206/102376/mwje4818.

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The test scenarios ranged from fires in the structures with no exterior ventilation to room fires with flow paths that connected the fires with remote intake and exhaust vents. In the ranch, two replicate fires were conducted for each room of origin and each ventilation condition. Rooms of fire origin included the living room, bedroom, and kitchen. In the colonial, the focus was on varying the flow paths to examine the change in fire behavior and the resulting damage. No replicates were conducted in the colonial. After each fire scene was documented, the interior finish and furnishings were replaced in affected areas of the structure. Instrumentation was installed to measure gas temperature, gas pressure, and gas movement within the structures. In addition, oxygen sensors were installed to determine when a sufficient level of oxygen was available for flaming combustion. Standard video and firefighting IR cameras were also installed inside of the structures to capture information about the fire dynamics of the experiments. Video cameras were also positioned outside of the structures to monitor the flow of smoke, flames, and air at the exterior vents. Each of the fires were started from a small flaming source. The fires were allowed to develop until they self-extinguished due to a lack of oxygen or until the fire had transitioned through flashover. The times that fires burned post-flashover varied based on the damage occurring within the structure. The goal was have patterns remaining on the ceiling, walls, and floors post-test. In total, thirteen experiments were conducted in the ranch structure and eight experiments were conducted in the colonial structure. All experiments were conducted at UL's Large Fire Laboratory in Northbrook, IL. Increasing the ventilation available to the fire, in both the ranch and the colonial, resulted in additional burn time, additional fire growth, and a larger area of fire damage within the structures. These changes are consistent with fire dynamics based assessments and were repeatable. Fire patterns within the room of origin led to the area of origin when the ventilation of the structure was considered. Fire patterns generated pre-flashover, persisted post-flashover if the ventilation points were remote from the area of origin.
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Hart, Carl, and Gregory Lyons. A tutorial on the rapid distortion theory model for unidirectional, plane shearing of homogeneous turbulence. Engineer Research and Development Center (U.S.), July 2022. http://dx.doi.org/10.21079/11681/44766.

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The theory of near-surface atmospheric wind noise is largely predicated on assuming turbulence is homogeneous and isotropic. For high turbulent wavenumbers, this is a fairly reasonable approximation, though it can introduce non-negligible errors in shear flows. Recent near-surface measurements of atmospheric turbulence suggest that anisotropic turbulence can be adequately modeled by rapid-distortion theory (RDT), which can serve as a natural extension of wind noise theory. Here, a solution for the RDT equations of unidirectional plane shearing of homogeneous turbulence is reproduced. It is assumed that the time-varying velocity spectral tensor can be made stationary by substituting an eddy-lifetime parameter in place of time. General and particular RDT evolution equations for stochastic increments are derived in detail. Analytical solutions for the RDT evolution equation, with and without an effective eddy viscosity, are given. An alternative expression for the eddy-lifetime parameter is shown. The turbulence kinetic energy budget is examined for RDT. Predictions by RDT are shown for velocity (co)variances, one-dimensional streamwise spectra, length scales, and the second invariant of the anisotropy tensor of the moments of velocity. The RDT prediction of the second invariant for the velocity anisotropy tensor is shown to agree better with direct numerical simulations than previously reported.
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Mueller, C., S. J. Piercey, M. G. Babechuk, and D. Copeland. Stratigraphy and lithogeochemistry of the Goldenville horizon and associated rocks, Baie Verte Peninsula, Newfoundland. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328990.

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The Goldenville horizon in the Baie Verte Peninsula is an important stratigraphic horizon that hosts primary (Cambrian to Ordovician) exhalative magnetite and pyrite and was a chemical trap for younger (Silurian to Devonian) orogenic gold mineralization. The horizon is overlain by basaltic flows and volcaniclastic rocks, is intercalated with variably coloured argillites and cherts, and underlain by mafic volcaniclastic rocks; the entire stratigraphy is cut by younger fine-grained mafic dykes and coarser gabbro. Lithogeochemical signatures of the Goldenville horizon allow it to be divided into high-Fe iron formation (HIF; >50% Fe2O3), low-Fe iron formation (LIF; 15-50% Fe2O3), and argillite with iron minerals (AIF; <15% Fe2O3). These variably Fe-rich rocks have Fe-Ti-Mn-Al systematics consistent with element derivation from varying mineral contributions from hydrothermal venting and ambient detrital sedimentation. Post-Archean Australian Shale (PAAS)-normalized rare earth element (REE) signatures for the HIF samples have negative Ce anomalies and patterns similar to modern hydrothermal sediment deposited under oxygenated ocean conditions. The PAAS-normalized REE signatures of LIF samples have positive Ce anomalies, similar to hydrothermal sediment deposited under anoxic to sub-oxic conditions. The paradoxical Ce behaviour is potentially explained by the Mn geochemistry of the LIF samples. The LIF have elevated MnO contents (2.0-7.5 weight %), suggesting that Mn from hydrothermal fluids was oxidized in an oxygenated water column during hydrothermal venting, Mn-oxides then scavenged Ce from seawater, and these Mn-oxides were subsequently deposited in the hydrothermal sediment. The Mn-rich LIF samples with positive Ce anomalies are intercalated with HIF with negative Ce anomalies, both regionally and on a metre scale within drill holes. Thus, the LIF positive Ce anomaly signature may record extended and particle-specific scavenging rather than sub-oxic/redox-stratified marine conditions. Collectively, results suggest that the Cambro-Ordovician Taconic seaway along the Laurentian margin may have been completely or near-completely oxygenated at the time of Goldenville horizon deposition.
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Computation of the time-varying flow rate from an artesian well in central Dade County, Florida, by analytical and numerical simulation methods. US Geological Survey, 1997. http://dx.doi.org/10.3133/wsp2491.

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