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Relevant bibliographies by topics / High Weissenberg number problem

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Academic literature on the topic 'High Weissenberg number problem'

Author: Grafiati

Published: 6 September 2023

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Journal articles on the topic "High Weissenberg number problem"

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Keunings, Roland. "On the high Weissenberg number problem." Journal of Non-Newtonian Fluid Mechanics 20 (January 1986): 209–26. http://dx.doi.org/10.1016/0377-0257(86)80022-2.

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Trebotich, David. "Toward a solution to the high Weissenberg number problem." PAMM 7, no. 1 (2007): 2100073–74. http://dx.doi.org/10.1002/pamm.200700989.

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Evans, J. D. "Re-entrant corner flows of upper convected Maxwell fluids: the small and high Weissenberg number limits." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 462, no. 2076 (2006): 3749–74. http://dx.doi.org/10.1098/rspa.2006.1737.

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We discuss here the steady planar flow of the upper convected Maxwell fluid at re-entrant corners in the singular limits of small and large Weissenberg number. The Weissenberg number is a parameter representing the dimensionless relaxation time and hence the elasticity of the fluid. Its value determines the strength of the fluid memory and thus the influence of elastic effects over viscosity. The small Weissenberg limit is that in which the elastic effects are small and the fluid's memory is weak. It is an extremely singular limit in which the behaviour of a Newtonian fluid is obtained in a ma

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Mohamadali, Meysam, and Nariman Ashrafi. "Similarity Solution for High Weissenberg Number Flow of Upper-Convected Maxwell Fluid on a Linearly Stretching Sheet." Journal of Engineering 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/9718786.

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High Weissenberg boundary layer flow of viscoelastic fluids on a stretching surface has been studied. The flow is considered to be steady, low inertial, and two-dimensional. Upon proper scaling and by means of an exact similarity transformation, the nonlinear momentum and constitutive equations of each layer transform into the respective system of highly nonlinear and coupled ordinary differential equations. Numerical solutions to the resulting boundary value problem are obtained using an efficient shooting technique in conjunction with a variable stepping method for different values of pressu

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TANOUE, Shuichi, Jiro KOGA, Toshihisa KAJIWARA, Yoshiyuki IEMOTO, and Kazumori FUNATSU. "High Weissenberg Number Problem and Numerical Simulation of an Annular Extrudate Swell of Viscoelastic Fluids." Seikei-Kakou 9, no. 10 (1997): 817–24. http://dx.doi.org/10.4325/seikeikakou.9.817.

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Bielça Silva, Luciene Aparecida, and Messias Meneguette. "Log-Conformation Representation of Hiperbolic Conservation Laws with Source Term." TEMA (São Carlos) 15, no. 3 (2014): 293. http://dx.doi.org/10.5540/tema.2014.015.03.0293.

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<pre>The objective of this work is to study, through a simpler equation, the statement that the numerical instability associated to the high number of Weissenberg in equations with source term can be resolved by the use of the so called logarithmic representation conformation. We will focus on hyperbolic conservation laws, but more specifically on the advection equation with source term. The source term imposes a necessity of an elastic balance, as well as the CFL convective balance for stability. We will see that the representation of such equation by log-conformation removes the restri

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Renardy, Michael. "The initial value problem for creeping flow of the upper convected Maxwell fluid at high Weissenberg number." Mathematical Methods in the Applied Sciences 38, no. 5 (2014): 959–65. http://dx.doi.org/10.1002/mma.3121.

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Varchanis, S., A. Syrakos, Y. Dimakopoulos, and J. Tsamopoulos. "A new finite element formulation for viscoelastic flows: Circumventing simultaneously the LBB condition and the high-Weissenberg number problem." Journal of Non-Newtonian Fluid Mechanics 267 (May 2019): 78–97. http://dx.doi.org/10.1016/j.jnnfm.2019.04.003.

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Abedijaberi, A., and B. Khomami. "Continuum and multi-scale simulation of mixed kinematics polymeric flows with stagnation points: Closure approximation and the high Weissenberg number problem." Journal of Non-Newtonian Fluid Mechanics 166, no. 11 (2011): 533–45. http://dx.doi.org/10.1016/j.jnnfm.2011.03.001.

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AFONSO, A. M., P. J. OLIVEIRA, F. T. PINHO, and M. A. ALVES. "Dynamics of high-Deborah-number entry flows: a numerical study." Journal of Fluid Mechanics 677 (April 13, 2011): 272–304. http://dx.doi.org/10.1017/jfm.2011.84.

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High-elasticity simulations of flows through a two-dimensional (2D) 4 : 1 abrupt contraction and a 4 : 1 three-dimensional square–square abrupt contraction were performed with a finite-volume method implementing the log-conformation formulation, proposed by Fattal & Kupferman (J. Non-Newtonian Fluid Mech., vol. 123, 2004, p. 281) to alleviate the high-Weissenberg-number problem. For the 2D simulations of Boger fluids, modelled by the Oldroyd-B constitutive equation, local flow unsteadiness appears at a relatively low Deborah number (De) of 2.5. Predictions at higher De were possible only w

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Dissertations / Theses on the topic "High Weissenberg number problem"

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Wang, Xiaojun. "Well-posedness results for a class of complex flow problems in the high Weissenberg number limit." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/27669.

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For simple fluids, or Newtonian fluids, the study of the Navier-Stokes equations in the high Reynolds number limit brings about two fundamental research subjects, the Euler equations and the Prandtl's system. The consideration of infinite Reynolds number reduces the Navier-Stokes equations to the Euler equations, both of which are dealing with the entire flow region. Prandtl's system consists of the governing equations of the boundary layer, a thin layer formed at the wall boundary where viscosity cannot be neglected. In this dissertation, we investigate the upper convected Maxwell(UCM) mod

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Niethammer, Matthias Samuel [Verfasser]. "A Finite Volume Framework for Viscoelastic Flows at High Weissenberg Number / Matthias Samuel Niethammer." München : Verlag Dr. Hut, 2019. http://d-nb.info/1190421909/34.

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Souccar, Adham W. "Heat Transfer and Mass Transfer with Heat Generation in Drops at High Peclet Number." University of Toledo / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1177603981.

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Dey, Anita Anup. "Experimental Study on Viscoelastic Fluid-Structure Interactions." 2017. https://scholarworks.umass.edu/masters_theses_2/502.

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It is well known that when a flexible or flexibly-mounted structure is placed perpendicular to the flow of a Newtonian fluid, it can oscillate due to the shedding of separated vortices at high Reynolds numbers. If the same flexible object is placed in non-Newtonian flows, however, the structure's response is still unknown. The main objective of this thesis is to introduce a new field of viscoelastic fluid-structure interactions by showing that the elastic instabilities that occur in the flow of viscoelastic fluids can drive the motion of a flexible structure placed in its path. Unlike Newtonia

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Arun, Dalal Swapnil. "A Numerical Study of Droplet Dynamics in Viscoelastic Flows." Thesis, 2016. http://etd.iisc.ernet.in/handle/2005/2702.

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The polymers are integral part of vast number of products used in day to day life due to their anomalous viscoelastic behaviour. The remarkable flow behaviour exhibited by the polymeric fluids including rod climbing, extrudate swell, tube-less siphon, viscoelastic jet, elastic recoil and sharkskin instability is attributed to the complex microstructures in the polymeric liquids that arise due to the interactions of long chain polymer molecules with each other and with the surrounding fluid particles. The significance of polymer in transportation, packaging, pharmaceutical, chemical, biomedical

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Books on the topic "High Weissenberg number problem"

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Fridman, Yuriy, and Aleksandr Korzhenevich. Learning to solve problems in physics: preparing for the Unified State Exam. INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/995926.

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If you are holding this textbook in your hands, it means that you understand the need to solve problems when studying a physics course at school. Indeed, it is difficult to overestimate the effect that the solution of problems in the study of physics gives. The textbook contains about 800 problems for the high school physics course. The tasks are based on the examination materials of various universities, including the Republic of Crimea, data from the magazines "Kvant", "Physics at School", information received from correspondence physics and mathematics schools of the Moscow State University

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Federighi, Paolo, and Francesca Torlone, eds. Low skilled take their qualifications "one step up". Firenze University Press, 2010. http://dx.doi.org/10.36253/978-88-6453-179-3.

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Adult learning is recognized as a key component of lifelong learning and Member States are required to remove barriers to participation, to increase overall quality and efficiency in adult learning, to speed up the process of validation and recognition and to ensure sufficient investment in and monitoring of the field (European Commission, 2006, 2007; European Parliament, 2008; European Council, 2008). It is unanimously recognized that adult learning can play a pivotal role in meeting the goals of the Lisbon Strategy, by fostering social cohesion, providing citizens with the skills required to

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Homenko, Elena. Legal regulation of the digital national payment system of the Russian Federation. INFRA-M Academic Publishing LLC., 2022. http://dx.doi.org/10.12737/1905572.

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The textbook is devoted to a currently relevant problem — the analysis of digital transformations in the modern national payment system and payment systems as its structural elements. The textbook reveals the features of the construction of the NPS of Russia, the range of its subjects, the relationship with the banking system of our state and the banking systems of a number of foreign countries. The features of the functioning of the payment system of the Bank of Russia are analyzed, its high importance in the field of settlements is shown , taking into account the new digital technologi

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O’Flaherty, Martin, Susanna Sans-Menendez, Simon Capewell, and Torben Jørgensen. Epidemiology of atherosclerotic cardiovascular disease: scope of the problem and its determinants. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199656653.003.0001.

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The epidemic of cardiovascular disease (CVD) in the twentieth century prompted many population-based surveys. Now, a huge number of epidemiological studies provide a clear picture of the risk for CVD. Approximately 80% of CVD can be explained by smoking, high blood pressure, and deterioration of lipid and glucose metabolism, the two latter mediated through an unhealthy diet (high intake of salt, saturated fat, and refined sugar) and physical inactivity. A causal web for CVD shows that the influence is seen throughout the life course, and that ‘upstream‘ factors like socioeconomic status, healt

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Riley, Barry. Change . . . and Resisting Change. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190228873.003.0022.

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The combination of ongoing U.S. budget stringency and continually increasing prices for food globally means that the size of traditional food aid shipments has been dropping. But so, too, has the number of food-insecure people. Is the need for food aid also declining? The number of refugees and conflict-displaced people is at an all-time high. In absolute numbers the food security situation in Sub-Saharan Africa is not improving. Continued high population growth and a slowing of progress in agricultural yields in that continent may mean that the hunger problem may well increase rather than dec

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Ashton, David, Caroline Lloyd, and Chris Warhurst. Business Strategies and Skills. Edited by John Buchanan, David Finegold, Ken Mayhew, and Chris Warhurst. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199655366.013.15.

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This chapter examines the link between business strategies and skill in the context of the the latter being regarded as key to economic growth and competitive advantage. A high-skilled workforce is viewed both as a driver of this approach and one of its outcomes. A number of countries have attempted to create more high-skilled jobs through raising the qualification levels of their workforces. The idea behind this supply-side intervention is that a high-skilled workforce will attract businesses that wish to or already do compete on quality and/or innovation or will encourage existing organisati

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Ruban, Anatoly I. Trailing-Edge Flow. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199681754.003.0004.

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Chapter 3 focuses on the high-Reynolds number flow of an incompressible fluid near the trailing edge of a flat plate. It begins with Goldstein’s (1930) solution for a viscous wake behind the plate, and shows that the displacement effect of the wake produces a singular pressure gradient near the trailing edge. It further shows that this singularity leads to a formation triple-deck viscous-inviscid interaction region that occupies a small vicinity of the trailing edge. A detailed analysis of the flow in each tier of the triple-deck structure is conducted based on the asymptotic analysis of the N

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Cheng, Russell. Finite Mixture Models. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198505044.003.0017.

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Fitting a finite mixture model when the number of components, k, is unknown can be carried out using the maximum likelihood (ML) method though it is non-standard. Two well-known Bayesian Markov chain Monte Carlo (MCMC) methods are reviewed and compared with ML: the reversible jump method and one using an approximating Dirichlet process. Another Bayesian method, to be called MAPIS, is examined that first obtains point estimates for the component parameters by the maximum a posteriori method for different k and then estimates posterior distributions, including that for k, using importance sampli

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Popovici, Ioana, and Michael T. French. Substance Use and School and Occupational Performance. Edited by Kenneth J. Sher. Oxford University Press, 2014. http://dx.doi.org/10.1093/oxfordhb/9780199381708.013.003.

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Health economists have been actively investigating the relationships between substance use and educational achievement/labor market performance outcomes. Although researchers agree on the direction and magnitude of the relationships between substance use and some of these outcomes, many questions remain unanswered. For instance, the literature generally indicates that drug use has a negative impact on most academic outcomes. Less evidence exists, however, of a negative impact of alcohol use on education. Although results suggest that drinking is associated with lower grades, and most research

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Pires, Stephen F., and William D. Moreto. The Illegal Wildlife Trade. Oxford University Press, 2016. http://dx.doi.org/10.1093/oxfordhb/9780199935383.013.161.

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The illegal wildlife trade is a growing problem driven by a number of factors (e.g. subsistence, alternative medicine, accessories, the pet trade). High demand for illicit wildlife products is threatening the existence of many of the most-endangered species. By unsustainably removing coveted species from the wild, communities that depend on such species for subsistence or eco-tourism will be adversely impacted by depleting populations. Laws and regulations have been implemented over the years, most notably CITES, to regulate the commercial trade in wildlife and prohibit trade in other species

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Book chapters on the topic "High Weissenberg number problem"

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Renardy, M. "High Weissenberg Number Asymptotics and Corner Singularities in Viscoelastic Flows." In IUTAM Symposium on Non–Linear Singularities in Deformation and Flow. Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4736-1_2.

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Steves, B. A., G. B. Valsecchi, E. Perozzi, and A. E. Roy. "Significant High Number Commensurabilities in the Main Lunar Problem II: The Occurrence of Saros-Like Near Periodicities." In Interactions Between Physics and Dynamics of Solar System Bodies. Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1902-3_28.

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Roy, A. E., B. A. Steves, G. B. Valsecchi, and E. Perozzi. "Significant High Number Commensurabilities in the Main Lunar Problem: A Postscript to a Discovery of the Ancient Chaldeans." In Predictability, Stability, and Chaos in N-Body Dynamical Systems. Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-5997-5_22.

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Yamada, Susumu, Toshiyuki Imamura, and Masahiko Machida. "High Performance Parallel LOBPCG Method for Large Hamiltonian Derived from Hubbard Model on Multi-GPU Systems." In Supercomputing Frontiers. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-10419-0_1.

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AbstractThe physical property of the Hubbard model can be understood by solving the eigenvalue problem for the Hamiltonian derived from the model. Since the Hamiltonian is a large sparse matrix, an iteration method is usually utilized for solving the problems. One of effectual solvers for this problem is the LOBPCG (Locally Optimal Block Preconditioned Conjugate Gradient) method. The tuning strategies of the method on GPU systems when all iteration vectors are stored in device memory have been proposed. In this research, we propose tuning strategies for parallel LOBPCG method on multi-GPU system when the Hamiltonian is large and some iteration vectors are stored in host memory. When the LOBPCG method is used for solving multi eigenpairs (eigenvalues and the corresponding eigenvectors), the number of iteration vectors, whose size is the same as the dimension of the Hamiltonian, is proportional to the number of the eigenpairs. On the other hand, the memory consumption for the non-zero elements of the Hamiltonian can be significantly reduced by considering the regular arrangement of the elements. Therefore, when we execute the LOBPCG method for a large Hamiltonian on GPUs, some of the vectors have to be stored on host memory and have to be transferred between host and device memory as needed. Since the cost of the data transfer is very large, we also propose the optimization for it. The simulation result on a multi-GPU system shows that the optimization of the data transfer is very effective for high performance computing.

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Tang, Lihe, Weidong Yang, Qiang Gao, Rui Xu, and Rongzhi Ye. "A Lightweight Verification Scheme Based on Dynamic Convolution." In Proceeding of 2021 International Conference on Wireless Communications, Networking and Applications. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2456-9_78.

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AbstractSince Electricity Grid Engineering involves a large number of personnel in the construction process, face recognition algorithms can be used to solve the personnel management problem. The recognition devices used in Electricity Grid Engineering are often mobile, embedded, and other lightweight devices with limited hardware performance. Although a large number of existing face recognition algorithms based on deep convolutional neural networks have high recognition accuracy, they are difficult to run in mobile devices or offline environments due to high computational complexity. In order to maintain the accuracy of face recognition while reducing the complexity of face recognition networks, a lightweight face recognition network based on Dynamic Convolution is proposed. Based on MobileNetV2, this paper introduces the Dynamic Convolution operation. It proposes a Dynamic Inverted Residuals Block, which enables the lightweight neural network to combine the feature extraction and learning ability of large neural networks to improve the recognition accuracy of the model. The experiments prove that the proposed model maintains high recognition accuracy while ensuring lightweight.

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Consoli, Sergio, Domenico Perrotta, and Marco Turchi. "Reduced Variable Neighbourhood Search for the Generation of Controlled Circular Data." In Variable Neighborhood Search. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69625-2_7.

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AbstractA number of artificial intelligence and machine learning problems need to be formulated within a directional space, where classical Euclidean geometry does not apply or needs to be readjusted into the circle. This is typical, for example, in computational linguistics and natural language processing, where language models based on Bag-of-Words, Vector Space, or Word Embedding, are largely used for tasks like document classification, information retrieval and recommendation systems, among others. In these contexts, for assessing document clustering and outliers detection applications, it is often necessary to generate data with directional properties and units that follow some model assumptions and possibly form close groups. In the following we propose a Reduced Variable Neighbourhood Search heuristic which is used to generate high-dimensional data controlled by the desired properties aimed at representing several real-world contexts. The whole problem is formulated as a non-linear continuous optimization problem, and it is shown that the proposed Reduced Variable Neighbourhood Search is able to generate high-dimensional solutions to the problem in short computational time. A comparison with the state-of-the-art local search routine used to address this problem shows the greater efficiency of the approach presented here.

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Andersson, Anna-Lena, and Kenneth Svensson. "Suicide in the Transport System." In The Vision Zero Handbook. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-76505-7_42.

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AbstractThe Swedish Transport Administration (STA) work to reduce the number of suicides in the transport system. Fatalities, i.e., on roads, railways, and bridges, originate from either accidents or suicides, natural death excluded. Knowing the correct manner of death is needed to work with optimal prevention strategies. The aims are to separate fatalities due to suicides, follow the development, and implement measures for suicide prevention. Methods are developed for suicide classification and criteria for the selection in which suicides were suspected. Fatalities in level one and two of five were classified as suicides. Data from the STA’s databases are used and so are data from the psychosocial investigations done by a trained investigator in the topic and with clinical experience from counselling at hospitals. 2129 persons died on the roads in Sweden, 10% (206 persons) were classified as suicides. 336 persons died after being hit by trains, 85% (284 persons) were suicides. 130 persons died by jumping from bridges.The number of suicides increases with population density. Suicide in the transport system is a major problem; firstly personal tragedies, it is also a work environment problem for truck and train drivers and for the emergency staff. It generates delays and costs for passenger and cargo transport. By analyzing the results of countermeasures in the form of obstructive barriers, the physical environment can be improved and high-risk areas can be accentuated. Restricting access to the means of suicide is important in suicide prevention. Strategies for the STA include suicide prevention in the design of new roads, railways, and bridges, as well as by identifying and reducing existing high-risk locations. Sharing the results with other authorities and organizations and cooperation within suicide prevention missions are vital for the enhancement of the overall suicide prevention work in society.

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Andersson, Anna-Lena, and Kenneth Svensson. "Suicide in the Transport System." In The Vision Zero Handbook. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-23176-7_42-2.

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AbstractThe Swedish Transport Administration (STA) work to reduce the number of suicides in the transport system. Fatalities, i.e., on roads, railways, and bridges, originate from either accidents or suicides, natural death excluded. Knowing the correct manner of death is needed to work with optimal prevention strategies. The aims are to separate fatalities due to suicides, follow the development, and implement measures for suicide prevention. Methods are developed for suicide classification and criteria for the selection in which suicides were suspected. Fatalities in level one and two of five were classified as suicides. Data from the STA’s databases are used and so are data from the psychosocial investigations done by a trained investigator in the topic and with clinical experience from counselling at hospitals. 2129 persons died on the roads in Sweden, 10% (206 persons) were classified as suicides. 336 persons died after being hit by trains, 85% (284 persons) were suicides. 130 persons died by jumping from bridges.The number of suicides increases with population density. Suicide in the transport system is a major problem; firstly personal tragedies, it is also a work environment problem for truck and train drivers and for the emergency staff. It generates delays and costs for passenger and cargo transport. By analyzing the results of countermeasures in the form of obstructive barriers, the physical environment can be improved and high-risk areas can be accentuated. Restricting access to the means of suicide is important in suicide prevention. Strategies for the STA include suicide prevention in the design of new roads, railways, and bridges, as well as by identifying and reducing existing high-risk locations. Sharing the results with other authorities and organizations and cooperation within suicide prevention missions are vital for the enhancement of the overall suicide prevention work in society.

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Andersson, Anna-Lena, and Kenneth Svensson. "Suicide in the Transport System." In The Vision Zero Handbook. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-23176-7_42-1.

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AbstractThe Swedish Transport Administration (STA) work to reduce the number of suicides in the transport system. Fatalities, i.e., on roads, railways, and bridges, originate from either accidents or suicides, natural death excluded. Knowing the correct manner of death is needed to work with optimal prevention strategies. The aims are to separate fatalities due to suicides, follow the development, and implement measures for suicide prevention. Methods are developed for suicide classification and criteria for the selection in which suicides were suspected. Fatalities in level one and two of five were classified as suicides. Data from the STA’s databases are used and so are data from the psychosocial investigations done by a trained investigator in the topic and with clinical experience from counselling at hospitals. 2129 persons died on the roads in Sweden, 10% (206 persons) were classified as suicides. 336 persons died after being hit by trains, 85% (284 persons) were suicides. 130 persons died by jumping from bridges.The number of suicides increases with population density. Suicide in the transport system is a major problem; firstly personal tragedies, it is also a work environment problem for truck and train drivers and for the emergency staff. It generates delays and costs for passenger and cargo transport. By analyzing the results of countermeasures in the form of obstructive barriers, the physical environment can be improved and high-risk areas can be accentuated. Restricting access to the means of suicide is important in suicide prevention. Strategies for the STA include suicide prevention in the design of new roads, railways, and bridges, as well as by identifying and reducing existing high-risk locations. Sharing the results with other authorities and organizations and cooperation within suicide prevention missions are vital for the enhancement of the overall suicide prevention work in society.

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"Defeating the High Weissenberg Number Problem." In Computational Rheology. PUBLISHED BY IMPERIAL COLLEGE PRESS AND DISTRIBUTED BY WORLD SCIENTIFIC PUBLISHING CO., 2002. http://dx.doi.org/10.1142/9781860949425_0007.

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Conference papers on the topic "High Weissenberg number problem"

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Ashrafi, N., M. Mohamadali, and M. Najafi. "High Weissenberg Number Stress Boundary Layer for the Upper Convected Maxwell Fluid." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36544.

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The classic Blassius problem of steady boundary-layer flow of the upper convected Maxwell over a flat plate in a moving fluid is studied. According to scaling parameters the equations represent the viscoelastic stress boundary layer. By means of an exact similarity transformation, the non-linear viscoelastic momentum and constitutive equations transform into a system of highly nonlinear coupled ordinary differential equations. Numerical solution may be achieved by a variable stepping method for the initial-value problem. The stepping numerical method chosen fifth order Runge-Kutta for solving

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Xue, Guanyang, Justin Caspar, Jaber Asiri, Xuanhong Cheng, and Alparslan Oztekin. "Parametric Study of Viscoelastic Flow Simulations in Microfluidic Devices." In ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-95153.

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Abstract The open-source C++ toolbox OpenFOAM is used to perform the Computational Fluid Dynamics (CFD) simulations in two-dimensional microfluidic devices to characterize the viscoelastic flow. The Oldroyd-B constitutive equation is coupled with continuity and momentum equations. Multiple stabilization methods are applied to the numerical simulation to simulate High Weissenberg Number Problem (HWNP) in the microchannel. We applied the Log Conformation Reformulation (LCR) method to guarantee the positive definiteness of the stress tensor. The CUBISTA scheme and the improved Both Side Diffusion

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Hagani, Fouad, M'hamed Boutaous, Ronnie Knikker, Shihe Xin, and Dennis Siginer. "Numerical Modeling of Non-Affine Viscoelastic Fluid Flow Including Viscous Dissipation Through a Square Cross-Section Duct: Heat Transfer Enhancement due to the Inertia and the Elastic Effects." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23558.

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Abstract Non-isothermal laminar flow of a viscoelastic fluid including viscous dissipation through a square cross–section duct is analyzed. Viscoelastic stresses are described by Giesekus modele orthe Phan-Thien–Tanner model and the solvent shear stress is given by the linear Newtonian constitutive relationship. The flow through the tube is governed by the conservation equations of energy, mass, momentum associated with to one non–affine rheological model mentioned above. The mixed type of the governing system of equations (elliptic–parabolic–hyperbolic) requires coupling between discretisatio

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Renardy, Michael. "Corner Singularities and High Weissenberg Number Asymptotics for Viscoelastic Fluids." In ASME 1996 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/imece1996-0230.

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Abstract Recent work on corner singularities in viscoelastic flows has shown that, in contrast to the Newtonian case, sharp boundary layers occur near the wall. These boundary layers can be viewed as a special instance of a more general phenomenon, which also occurs in other high Weissenberg number flows. This lecture reviews the derivation of boundary layer equations and their application, in particular to corner flow.

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Junio da Silva Furlan, Laison, Matheus Tozo de Araujo, Leandro Franco de Souza, Analice Costacurta Brandi, and Marcio Teixeira de Mendonca. "Stability Analysis of Viscoelastic Fluid Flows for the High Weissenberg Number." In 25th International Congress of Mechanical Engineering. ABCM, 2019. http://dx.doi.org/10.26678/abcm.cobem2019.cob2019-2036.

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Carreira, Beatriz Liara, Analice Costacurta Brandi, Laison Junio da Silva Furlan, Matheus Tozo de Araujo, and Leandro Franco de Souza. "Log-Conformation and Square Root-Conformation Transformations in High Weissenberg Number Flows." In 25th International Congress of Mechanical Engineering. ABCM, 2019. http://dx.doi.org/10.26678/abcm.cobem2019.cob2019-1949.

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Carreira, Beatriz Liara, Analice Costacurta Brandi, Matheus Tozo de Araujo, Laison Junio da Silva Furlan, and Leandro Franco de Souza. "HYDRODYNAMIC STABILITY ANALYSIS IN HIGH WEISSENBERG NUMBER FLOWS VIA LOG-CONFORMATION TRANSFORMATION." In 12th Spring School on Transition and Turbulence. ABCM, 2020. http://dx.doi.org/10.26678/abcm.eptt2020.ept20-0047.

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Jafari, Azadeh, Michel O. Deville, and Nicolas Fiétier. "Spectral Elements Analysis for Viscoelastic Fluids at High Weissenberg Number Using Logarithmic conformation Tensor Model." In NUMERICAL ANALYSIS AND APPLIED MATHEMATICS: International Conference on Numerical Analysis and Applied Mathematics 2008. American Institute of Physics, 2008. http://dx.doi.org/10.1063/1.2990912.

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Amoura, Meriem, and Noureddine Zeraibi. "Effect of Viscous Dissipation on Heat Transfer Between Two Concentric Cylinders for Carreau Fluids." In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-24544.

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In this paper, we present a numerical study of the flow characteristics and heat transfer mechanism of a non-Newtonian fluid in an annular space between two coaxial rotating cylinders taking into account the effect of viscous dissipation. The Carreau stress-strain relation was adopted to model the rheological fluid behavior. The problem is studied when the heated inner cylinder rotates around the common axis with constant angular velocity and the cooled outer cylinder is at the rest. The horizontal endplates are assumed adiabatic. In-house code which is based on a Galerkin mixed finite element

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Ashrafi, Nariman, and Sepideh Samghani. "Oscillating Viscoelastic Flow." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-85635.

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The flow of nonlinear viscoelastic fluids between oscillating parallel plates is investigated. The investigation features time-dependent analysis of a complicated viscoelastic material modeled based on the Johnson-Segalman constitutive relation. Given the rheological parameters of certain material known from experiments, the coefficients of Johnson-Segalman constitutive equation model for the material are evaluated by fitting the data. The problem is first formulated by writing the governing equations for the flow between two independently oscillating parallel plates, i.e. oscillating Couette

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Reports on the topic "High Weissenberg number problem"

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Oyekan, Khalimath, Ayodotun Ayorinde, and Oreoluwa Adenuga. The Problem of Out-of-School Children in Nigeria. Research on Improving Systems of Education (RISE), 2023. http://dx.doi.org/10.35489/bsg-rise-ri_2023/058.

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In 2015, all United Nations Member States adopted the 2030 Agenda for Sustainable Development which outlines a blueprint to address global challenges across a broad range of themes including poverty, health, education, inequality, climate change, environmental degradation, peace and justice. The Goal 4 of the 2030 Agenda for Sustainable Development, otherwise referred to as the United Nations Sustainable Development Goal 4, seeks to ensure inclusive and equitable quality education and promote lifelong learning opportunities for all. Unfortunately, an approximated 263 million children remain ou

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TERENTIEV, S., O. GRUNINA, and L. PONOMAREVA. FEATURES OF THE PRODUCTION OF DOUGH SEMI-FINISHED PRODUCT PRODUCED USING LENTIL FLOUR. Science and Innovation Center Publishing House, 2022. http://dx.doi.org/10.12731/2070-7568-2022-11-2-4-15-22.

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Bread consumption has a stable increase in the territory of Russia and in particular in the Ulyanovsk and Samara regions. Bread, as a fairly low-priced product, is in high demand among consumers, but this product is not biologically saturated with useful substances, therefore, in modern production, a number of techniques are used to increase the nutritional and biological value of these types of products. In our work, one of these methods will be considered - the introduction of lentil flour into dough preparations. The problem is that the state policy regarding import substitution, aimed at r

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Ayoul-Guilmard, Q., S. Ganesh, M. Nuñez, et al. D5.4 Report on MLMC for time dependent problems. Scipedia, 2021. http://dx.doi.org/10.23967/exaqute.2021.2.005.

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In this report, we study the use of Multi-Level Monte Carlo (MLMC) methods for time dependent problems. It was found that the usability of MLMC methods depends strongly on whether or not the underlying time dependent problem is chaotic in nature. Numerical experiments are conducted on both simple problems, as well as fluid flow problems of practical interest to the ExaQUte project, to demonstrate this. For the non-chaotic cases, the hypotheses that enable the use of MLMC methods were found to be satisfied. For the chaotic cases, especially the case of high Reynolds’ number fluid flow, the hypo

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Symonenko, Svitlana V., Nataliia V. Zaitseva, Viacheslav V. Osadchyi, Kateryna P. Osadcha, and Ekaterina O. Shmeltser. Virtual reality in foreign language training at higher educational institutions. [б. в.], 2020. http://dx.doi.org/10.31812/123456789/3759.

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The paper deals with the urgent problem of application of virtual reality in foreign language training. Statistical data confirms that the number of smartphone users, Internet users, including wireless Internet users, has been increasing for recent years in Ukraine and tends to grow. The coherence of quick mobile Internet access and presence of supplementary equipment enables to get trained or to self-dependently advance due to usage of virtual reality possibilities for education in the stationary classrooms, at home and in motion. Several important features of virtual reality, its advantages

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Malej, Matt, and Fengyan Shi. Suppressing the pressure-source instability in modeling deep-draft vessels with low under-keel clearance in FUNWAVE-TVD. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/40639.

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This Coastal and Hydraulics Engineering Technical Note (CHETN) documents the development through verification and validation of three instability-suppressing mechanisms in FUNWAVE-TVD, a Boussinesq-type numerical wave model, when modeling deep-draft vessels with a low under-keel clearance (UKC). Many large commercial ports and channels (e.g., Houston Ship Channel, Galveston, US Army Corps of Engineers [USACE]) are traveled and affected by tens of thousands of commercial vessel passages per year. In a series of recent projects undertaken for the Galveston District (USACE), it was discovered tha

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Perkins, Dustin. Invasive exotic plant monitoring at Dinosaur National Monument: Results of the 2019 field season on the Green River, and the third completed monitoring rotation. Edited by Alice Wondrak Biel. National Park Service, 2021. http://dx.doi.org/10.36967/nrr-2284627.

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Invasive exotic plant (IEP) species are a significant threat to natural ecosystem integrity and biodiversity, and controlling them is a high priority for the National Park Service. The Northern Colorado Plateau Network (NCPN) selected the early detection of IEPs as one of 11 monitoring protocols to be implemented as part of its long-term monitoring program. We also calculated a patch management index (PMI) to quantify the extent and density of invasive patches into a single value that helps identify the scale of the problem. Park managers can use this tool to help prioritize IEP treatment. At

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Duvvuri, Sarvani, and Srinivas S. Pulugurtha. Researching Relationships between Truck Travel Time Performance Measures and On-Network and Off-Network Characteristics. Mineta Transportation Institute, 2021. http://dx.doi.org/10.31979/mti.2021.1946.

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Trucks serve significant amount of freight tonnage and are more susceptible to complex interactions with other vehicles in a traffic stream. While traffic congestion continues to be a significant ‘highway’ problem, delays in truck travel result in loss of revenue to the trucking companies. There is a significant research on the traffic congestion mitigation, but a very few studies focused on data exclusive to trucks. This research is aimed at a regional-level analysis of truck travel time data to identify roads for improving mobility and reducing congestion for truck traffic. The objectives of

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NELYUBINA, E., and L. PANFILOVA. ASSESSMENT OF THE QUALITY OF EDUCATIONAL ELECTRONIC PUBLICATIONS AND RESOURCES. Science and Innovation Center Publishing House, 2021. http://dx.doi.org/10.12731/2658-4034-2021-12-4-2-85-97.

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Now the whole life of a person has switched to online mode. These changes also affected the education system. This means the need to introduce new technologies into the educational process. Books, manuals, printed publications are being replaced by electronic educational resources. Providing up-to-date, verified information to students has always been and remains one of the most important functions of the teacher. Unfortunately, with the transition of training to the online mode, the teacher cannot use his literature when conducting classes. In this regard, there is a need to use electronic re

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Samochowiec, Jakub, Johannes C. Bauer, and Kathrin Neumüller. Strategies for Dealing With the Labour Shortage – An Overview. Gdi-verlag, GDI Gottlieb Duttweiler Institute, 2023. http://dx.doi.org/10.59986/hcmm6371.

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The Swiss labour market will shrink without immigration. But even with high immigrationnfigures, it will not be possible to maintain the previous growth of the labour market. Employers need to adapt to this situation. This study compiles and arranges different measures for dealing with the labour shortage, with the aim of showing different approaches to deal with the situation. The measures are arranged following the formula: Number of person-hours x efficiency = output The increase in the number of person-hours includes, on the one hand, measures to make employers more attractive. These are r

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Landau, Sergei Yan, John W. Walker, Avi Perevolotsky, Eugene D. Ungar, Butch Taylor, and Daniel Waldron. Goats for maximal efficacy of brush control. United States Department of Agriculture, 2008. http://dx.doi.org/10.32747/2008.7587731.bard.

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Background. Brush encroachment constitutes a serious problem in both Texas and Israel. We addressed the issue of efficacy of livestock herbivory - in the form of goat browsing - to change the ecological balance to the detriment of the shrub vegetation. Shrub consumption by goats is kept low by plant chemical defenses such as tannins and terpenes. Scientists at TAES and ARO have developed an innovative, cost-effective methodology using fecal Near Infrared Spectrometry to elucidate the dietary percentage of targeted, browse species (terpene-richredberry and blueberry juniper in the US, and tanni

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