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Littérature scientifique sur le sujet « Non-simple fluid »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Non-simple fluid"

Zatloukal, Martin. "A simple phenomenological non-Newtonian fluid model." Journal of Non-Newtonian Fluid Mechanics 165, no. 11-12 (2010): 592–95. http://dx.doi.org/10.1016/j.jnnfm.2010.02.019.

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Teja, Amyn S., and Tongfan Sun. "A simple non-classical equation of state for fluids and fluid mixtures." Fluid Phase Equilibria 161, no. 1 (1999): 63–76. http://dx.doi.org/10.1016/s0378-3812(99)00161-2.

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ZHOU, SHIQI. "EXTENDING SIMPLE WEIGHTED DENSITY APPROXIMATION FOR HARD SPHERE FLUID TO LENNARD–JONES FLUID (I): TEST." International Journal of Modern Physics B 19, no. 32 (2005): 4701–21. http://dx.doi.org/10.1142/s0217979205033078.

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A theoretical formalism which can be combined with any hard sphere density functional approximations (DFA) to construct DFA for non-hard sphere fluids with a hard or soft core subjected to diverse external potentials is proposed. To show validity and power of the present formalism, we employ a simple weighted density approximation as an illustrating example. It is found that the resultant DFA for Lennard–Jones fluid under influences of diverse extenal potentials is in generally satisfactory agreement with corresponding simulational results even though the co-existence bulk fluid in the particle reservoir with which the non-uniform fluid under consideration is connected, is situated at "dangerous" regions. The significance of the present formalism lies in that it can be combined with any other hard sphere DFAs to construct DFAs for any non-hard sphere fluids with a hard or soft core.

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Fujitani, Youhei. "A Simple Formulation of Non-Equilibrium Thermodynamics of a Polarizable Fluid." Journal of the Physical Society of Japan 70, no. 6 (2001): 1556–64. http://dx.doi.org/10.1143/jpsj.70.1556.

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Payam, A. F., W. Trewby, and K. Voïtchovsky. "Simultaneous viscosity and density measurement of small volumes of liquids using a vibrating microcantilever." Analyst 142, no. 9 (2017): 1492–98. http://dx.doi.org/10.1039/c6an02674e.

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An analytical model is derived to calculate the viscosity and density of small volumes of fluid from the resonance frequencies of an immersed microcantilever. Its accuracy is verified on simple and non-Newtonian fluids.

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Dai, F., and M. M. Khonsari. "A Theory of Hydrodynamic Lubrication Involving the Mixture of Two Fluids." Journal of Applied Mechanics 61, no. 3 (1994): 634–41. http://dx.doi.org/10.1115/1.2901507.

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Based on the principles of continuum mechanics, we drive the governing equations for the hydrodynamic lubrication involving the mixture of two incompressible fluids. The governing equations are general in the sense that they can be applied to the mixture of any simple non-Newtonian fluid with a Newtonian fluid. A mixture thus formed is considered to be nonhomogeneous and non-Newtonian. In the theoretical development, the interaction between the constituents is taken into consideration. It is shown that a number of currently available models are special cases of the theory presented in this paper. As an example, results are presented for journal bearing performance lubricated with a mixture of a power-law fluid mixed with Newtonian oil.

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Lenci, Alessandro, and Luca Chiapponi. "An Experimental Setup to Investigate Non-Newtonian Fluid Flow in Variable Aperture Channels." Water 12, no. 5 (2020): 1284. http://dx.doi.org/10.3390/w12051284.

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Non-Newtonian fluid flow in porous and fractured media is of considerable technical and environmental interest. Here, the flow of a non-Newtonian fluid in a variable aperture fracture is studied theoretically, experimentally and numerically. We consider a shear-thinning power-law fluid with flow behavior index n. The natural logarithm of the fracture aperture is a two-dimensional, spatially homogeneous and correlated Gaussian random field. An experimental device has been conceived and realized to allow the validation of the theory, and several tests are conducted with Newtonian and shear-thinning fluids and different combinations of parameters to validate the model. For Newtonian fluids, experimental results match quite well the theoretical predictions, mostly with a slight overestimation. For non-Newtonian fluids, the discrepancy between experiments and theory is larger, with an underestimation of the experimental flow rate. We bear in mind the high shear-rates involved in the experiments, covering a large range where simple models seldom are effective in reproducing the process, and possible interferences like slip at the wall. For all test conditions, the comparison between analytical and numerical model is fairly good.

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SASAKI, Kazuhiko, and Kazuhiko KASAI. "MACROSCOPIC AND SIMPLE NON-LINEAR MODELING OF VISCOUS FLUID MATERIAL UNDER LARGER STRAINS." Journal of Structural and Construction Engineering (Transactions of AIJ) 78, no. 685 (2013): 607–15. http://dx.doi.org/10.3130/aijs.78.607.

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Sekimoto, Ken. "An exact non-stationary solution of simple shear flow in a Bingham fluid." Journal of Non-Newtonian Fluid Mechanics 39, no. 1 (1991): 107–13. http://dx.doi.org/10.1016/0377-0257(91)80006-6.

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McKinney, Michella M., and Andrew Parkinson. "A simple, non-chromatographic procedure to purify immunoglobulins from serum and ascites fluid." Journal of Immunological Methods 96, no. 2 (1987): 271–78. http://dx.doi.org/10.1016/0022-1759(87)90324-3.

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Thèses sur le sujet "Non-simple fluid"

GIUSTERI, GIULIO GIUSEPPE. "Higher-grandient theories for fluids and concentrated effects." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2012. http://hdl.handle.net/10281/28154.

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I consider the Virtual Power framework for Continuum Mechanics, which has recently gained considerable attention, mainly in connection with its applicability to non-classical models for materials. I introduce a geometrical approach to possibly infinite dimensional dynamical systems, based on the theory of Banach manifolds, which has not yet been fully exploited in Continuum Mechanics, though it has been used in some particular cases. This theory generalizes the Virtual Power framework, being even more flexible and allowing for the construction of continuum mechanical models on non-Euclidean domains. I studied the mathematical properties of a general linear isotropic incompressible second-gradient fluid. Constitutive prescriptions for these fluids are discussed, together with the constraints imposed by thermodynamical considerations. The key features of the analyzed model are the possibility of describing the adherence interaction of a three-dimensional fluid with one-dimensional structures immersed in it, and also of including concentrated interactions. A presentation of higher-gradient theories is provided, using the general framework proposed for dynamical systems. They turn out to be a particular class of continuum mechanical models, arising from precise assumptions on the kinematics of the descriptors of the system. Higher-order powers are defined as integral representations of elements of the cotangent bundle on the Banach manifold of the descriptors. Exploiting equivalent integral representations for powers of arbitrary order, the appearance of boundary interactions with a non-standard structure is described. The differential problems associated with the pressure-driven flow of a second-order linear liquid, which adheres to a one-dimensional structure, is considered. Existence and uniqueness of solution are established, also for the situation in which the one-dimensional structure drags the three-dimensional fluid, producing the motion. Finally, some examples are provided, in order to give explicit solutions, to show how the concentrated stresses, if present, can be computed, and to suggest possible interpretations for the physical meaning of the higher-order material parameters.

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Murray, Stuart William. "Wave radiation in simple geophysical models." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/7922.

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Wave radiation is an important process in many geophysical flows. In particular, it is by wave radiation that flows may adjust to a state for which the dynamics is slow. Such a state is described as “balanced”, meaning there is an approximate balance between the Coriolis force and horizontal pressure gradients, and between buoyancy and vertical pressure gradients. In this thesis, wave radiation processes relevant to these enormously complex flows are studied through the use of some highly simplified models, and a parallel aim is to develop accurate numerical techniques for doing so. This thesis is divided into three main parts. 1. We consider accurate numerical boundary conditions for various equations which support wave radiation to infinity. Particular attention is given to discretely non-reflecting boundary conditions, which are derived directly from a discretised scheme. Such a boundary condition is studied in the case of the 1-d Klein-Gordon equation. The limitations concerning the practical implementation of this scheme are explored and some possible improvements are suggested. A stability analysis is developed which yields a simple stability criterion that is useful when tuning the boundary condition. The practical use of higher-order boundary conditions for the 2-d shallow water equations is also explored; the accuracy of such a method is assessed when combined with a particular interior scheme, and an analysis based on matrix pseudospectra reveals something of the stability of such a method. 2. Large-scale atmospheric and oceanic flows are examples of systems with a wide timescale separation, determined by a small parameter. In addition they both undergo constant random forcing. The five component Lorenz-Krishnamurthy system is a system with a timescale separation controlled by a small parameter, and we employ it as a model of the forced ocean by further adding a random forcing of the slow variables, and introduce wave radiation to infinity by the addition of a dispersive PDE. The dynamics are reduced by deriving balance relations, and numerical experiments are used to assess the effects of energy radiation by fast waves. 3. We study quasimodes, which demonstrate the existence of associated Landau poles of a system. In this thesis, we consider a simple model of wave radiation that exhibits quasimodes, that allows us to derive some explicit analytical results, as opposed to physically realistic geophysical fluid systems for which such results are often unavailable, necessitating recourse to numerical techniques. The growth rates obtained for this system, which is an extension of one considered by Lamb, are confirmed using numerical experiments.

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Dupuis, Victor. "Étude expérimentale d’écoulements soumis à une transition longitudinale de rugosité en lit simple et en lit composé." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1154/document.

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Ce travail de thèse s'intéresse à l'effet d'une variation longitudinale de l'occupation du sol de la plaine d'inondation sur l'écoulement d'une rivière en débordement. Nous traitons le cas d'une transition entre une zone de prairie et une zone de forêt, et vice versa. Cette variation d'occupation du sol est associée à une transition de rugosité hydraulique entre une rugosité de fond (prairie fortement immergée) et des macro-rugosités émergées (arbres), modélisées respectivement par une moquette plastifiée et par un champ de cylindres. Ces écoulements sont étudiés en laboratoire dans un canal de dimension 18 m x 3 m. Dans un premier temps, nous considérons l'écoulement à travers un champ de cylindres émergents en lit simple, en étudiant l'effet du fond sur le sillage des cylindres et le phénomène de seiche (fortes oscillations de la surface libre). Dans un deuxième temps, nous nous penchons sur le développement vers l'uniformité d'un écoulement en lit composé de rugosité uniforme. La croissance asymétrique de la couche de mélange du lit composé, la propriété d'autosimilarité ainsi que l'organisation tridimensionnelle des structures turbulentes cohérentes associées à la couche de mélange sont analysées. Le troisième temps fait l'objet de la transition longitudinale de rugosité en lit composé, dont l'effet sur la couche de mélange et sur les structures cohérentes est discuté. Nous évaluons également les différentes contributions au transfert latéral de quantité de mouvement entre lit mineur et plaine d'inondation par diffusion turbulente, par échange de masse et par les courants secondaires<br>This PhD thesis investigates the effect of a longitudinal change in floodplain land use on an overflooding river flow. We consider a transition between a meadow and a woodland and vice versa. This change in land use is associated with a change in hydraulic roughness, between a bed roughness (highly submerged meadow) and emergent macro-roughnesses (trees), respectively modelled by a plastic artificial grass and an array of emergent cylinders. The flows are experimentally investigated in an 18 m x 3 m laboratory flume. In a first step, we investigate the flow through a cylinder array in a single channel, focusing on the effect of bed roughness on the cylinder wakes and on the seiche phenomenon (strong free surface oscillations). In a second step, we study the development towards flow uniformity of compound channel flows with a uniform hydraulic roughness on the floodplains. The asymmetrical growth of the compound channel mixing layer, the self-similarity property and the three-dimensional organisation of the turbulent coherent structures associated with the mixing layer are analysed. In a third step, we investigate the longitudinal change in roughness in compound channel configuration, which effects on mixing layer and on coherent structures are discussed. We also assess the contributions to lateral transfers of momentum between main channel and floodplain by turbulent diffusion, by mass exchange and by secondary currents

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Hopkins, Alan John. "Computer simulation studies of dense suspension rheology : computational studies of model sheared fluids : elucidation, interpretation and description of the observed rheological behaviour of simple colloidal suspensions in the granulo-viscous domain by non-equilibrium particulate dynamics." Thesis, University of Bradford, 1989. http://hdl.handle.net/10454/4408.

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Rheological properties of idealised models which exhibit all the non-Newtonian flow phenomenology commonly seen in dense suspensions are investigated by particulate-dynamics computer-simulations. The objectives of these investigations are: (i) to establish the origins of various aspects of dense suspension rheology such as shear-thinning, shear thickening and dilatancy; (ii) to elucidate the different regions of a typical dense suspension rheogram by examining underlying structures and shear induced anisotropies in kinetic energy, diffusivity and pressure; (iii) to investigate the scaling of the simplest idealised model suspension; i.e. the hard-sphere model in Newtonian media and its relationship to the isokinetic flow curves obtained through non-equilibrium molecular dynamics (NEMD) simulations; (iv) to preliminarily determine the effect of perturbations present in all real colloidal suspensions, namely particle size polydispersity and a slight 'softness' of the interparticle potential. Non-equilibrium isokinetic simulations have been performed upon ;systems of particles interacting through the classical hard-sphere potential and a perturbation thereof, in which the hard-core is surrounded by a 'slightly soft' repulsive skin. The decision to base the present work upon isokinetic studies was made in order to obtain a better under- standing of suspension rheology by making a direct connection with previous NEMD studies of thermal systemst(93). These studies have shown that the non-linear behaviour exhibited by these systems under shear is atttributable to a shear-induced perturbation of the equilibrium phase behaviour. The present study shows this behaviour to correspond to the high shear region of the generalised suspension flow curve.

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Livres sur le sujet "Non-simple fluid"

Abdelattif, Engy, and Anthony J. Freemont. Assessment of synovial joint fluid. Oxford University Press, 2013. http://dx.doi.org/10.1093/med/9780199642489.003.0072.

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Assessment of synovial joint fluid is a simple, cheap, and relatively non-invasive test that can be applied to the whole spectrum of joint diseases, provided there is sufficient fluid within the joint to aspirate. The chapter outlines the key steps in undertaking microscopic analysis of synovial fluid in order to maximize the diagnostic and prognostic return, while placing the features seen within the context of some of the most important joint diseases. The chapter also examines the changing face of microbiological examination of synovial fluid to diagnose joint infection as a primary event and also the increasingly important problem of infection secondary to joint replacement surgery.

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Abdelattif, Engy, Anthony J. Freemont, and DC Mangham. Assessment of synovial joint fluid. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199642489.003.0072_update_002.

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Campbell, Eric W. Commands in Zenzontepec Chatino (Otomanguean). Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198803225.003.0005.

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This chapter presents Zenzontepec Chatino (Otomanguean, Zapotecan) data from naturally occurring discourse and describes the linguistic resources that speakers draw from to express a wide range of command types. Canonical imperatives, addressee-directed commands of basic force, are morphologically complex and display many forms for one category, determined by the inflectional class of the verb. In contrast, all non-canonical directives, those targeting first or third persons or the negative second person directives, are formally simple, all being expressed with Potential Mood inflection (one category for many functions). The full range of command forms and strategies is a reflection of Zenzontepec Chatino grammar more broadly, which has idiosyncratic and prodigiously complex inflectional morphology but formally simple and fluid syntax in discourse. The Imperative Mood category has been previously little studied in Zapotecan languages, and it offers insight into other aspects of the inflectional system and its history.

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Escudier, Marcel. Units of measurement, dimensions, and dimensional analysis. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198719878.003.0003.

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In this chapter the crucial role of units and dimensions in the analysis of any problem involving physical quantities is explained. The International System of Units (SI) is introduced. The major advantage of collecting the physical quantities, which are included in either a theoretical analysis or an experiment, into non-dimensional groups is shown to be a reduction in the number of quantities which need to be considered separately. This process, known as dimensional analysis, is based upon the principle of dimensional homogeneity. Buckingham’s Π‎ theorem is introduced as a method for determining the number of non-dimensional groups (the Π‎’s) corresponding with a set of dimensional quantities and their dimensions. A systematic and simple procedure for identifying these groups is the sequential elimination of dimensions. The scale-up from a model to a geometrically similar full-size version is shown to require dynamic similarity. The definitions and names of the non-dimensional groups most frequently encountered in fluid mechanics have been introduced and their physical significance explained.

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Chapitres de livres sur le sujet "Non-simple fluid"

Heinen, Matthias, Simon Homes, Gabriela Guevara-Carrion, and Jadran Vrabec. "Mass Transport Across Droplet Interfaces by Atomistic Simulations." In Fluid Mechanics and Its Applications. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09008-0_13.

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AbstractDue to availability of powerful computers and efficient algorithms, physical processes occurring at the micrometer scale can nowadays be studied with atomistic simulations. In the framework of the collaborative research center SFB-TRR75 “Droplet dynamics under extreme ambient conditions”, investigations of the mass transport across vapour-liquid interfaces are conducted. Non-equilibrium molecular dynamics simulation is employed to study single- and two-phase shock tube scenarios for a simple noble gas-like fluid. The generated data show an excellent agreement with computational fluid dynamics simulations. Further, particle and energy flux during evaporation are sampled and analysed with respect to their dependence on the interface temperature, employing a newly developed method which ensures a stationary process. In this context, the interface properties between liquid nitrogen and hydrogen under strong gradients of temperature and composition are investigated. Moreover, the Fick diffusion coefficient of strongly diluted species in supercritical CO$$_{2}$$ 2 is predicted by equilibrium molecular dynamics simulation and the Green-Kubo formalism. These results are employed to assess the performance of several predictive equations from the literature.

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Lomba, Enrique. "On the Non-Solution Region of the Hypernetted Chain and Related Equations for Ionic and Simple Fluids." In Supercritical Fluids. Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-015-8295-7_12.

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"The Non-Uniform State for a Simple Gas." In Fluid Mechanics and Its Applications. Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-5865-3_5.

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Carpenter, P. W. "THE HYDRODYNAMIC STABILITY OF FLOWS OVER SIMPLE NON-ISOTROPIC COMPLIANT SURFACES." In Frontiers of Fluid Mechanics. Elsevier, 1988. http://dx.doi.org/10.1016/b978-0-08-036232-8.50039-6.

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"Fluid Mechanics." In Chemical Engineering Explained: Basic Concepts for Novices. The Royal Society of Chemistry, 2017. http://dx.doi.org/10.1039/bk9781782628613-00189.

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How do gases and liquids move through pipe networks? We begin by considering the difference between laminar and turbulent flow, and the different types of flow we will see when liquid and gas phases are flowing within the one pipe. A section of the chapter is devoted to pipes and the different types of valves found in processing plants. Examples illustrate how to calculate the pressure drop in simple pipes, and Newtonian and non-Newtonian fluids, flow under a pressure driving force, and more complex pipe runs that contain valves and other fittings. We then consider the operation and design of different types of pumps and how they may be selected to meet a range of pumping tasks.

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Abdelattif, Engy, Anthony J. Freemont, and DC Mangham. "Assessment of synovial joint fluid." In Oxford Textbook of Rheumatology. Oxford University Press, 2013. http://dx.doi.org/10.1093/med/9780199642489.003.0072_update_003.

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Assessment of synovial fluid is a simple, cheap, and relatively non-invasive test that can be applied to the whole spectrum of joint diseases, provided there is sufficient fluid within the joint to aspirate. The chapter outlines the key steps in undertaking microscopic analysis of synovial fluid in order to maximize the diagnostic and prognostic return, while placing the features seen within the context of some of the most important joint diseases. The chapter also examines the changing face of microbiological examination of synovial fluid to diagnose joint infection as a primary event and also the increasingly important problem of infection secondary to joint replacement surgery.

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BÖHME, G. "SIMPLE UNSTEADY FLOWS." In Non-Newtonian Fluid Mechanics. Elsevier, 1987. http://dx.doi.org/10.1016/b978-0-444-70186-2.50009-1.

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HUILGOL, R. R., N. PHAN-THIEN, and R. ZHENG. "A THEORETICAL AND NUMERICAL STUDY OF NON-FOURIER EFFECTS IN VISCOMETRIC AND EXTENSIONAL FLOWS OF AN INCOMPRESSIBLE SIMPLE FLUID." In Theoretical and Applied Rheology. Elsevier, 1992. http://dx.doi.org/10.1016/b978-0-444-89007-8.50121-0.

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Brucato, Antonio, and Stefano Maggiolini. "Pericardial effusion." In ESC CardioMed, edited by Yehuda Adler. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198784906.003.0377.

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Pericardial effusion is classified according to its onset—acute, subacute, or chronic (>3 months)—distribution (circumferential or loculated), and haemodynamic impact. Concerning the size, we propose a simple semiquantitative echocardiographic assessment: mild (<10 mm), moderate (10–20 mm), and large (>20 mm), evaluated as the largest telediastolic echo-free space in two-dimensional mode. Symptoms vary according to the speed of accumulation; slow accumulation may induce no or minor symptoms. In the presence of chronic, large pericardial effusions, appropriate tests for neoplasms, tuberculosis, and hypothyroidism should be considered. Chest computed tomography scanning is helpful in reaching an aetiological diagnosis (neoplasms, lymphomas, pneumonia, tuberculosis). High values of proteins, albumin, and lactate dehydrogenase are usually considered indicative of an exudate, as in pleural fluid, but this may not be true for pericardial fluid, and cytology has a sensitivity of only 50% for neoplasm. Mycobacterium cultures and a genome search for tuberculosis with the polymerase chain reaction in pericardial fluid are mandatory if pericardiocentesis is performed. If inflammatory signs are present, the clinical management should be that of pericarditis and a trial of non-steroidal anti-inflammatory drugs, colchicine, or low-dose corticosteroids, or a combination of these, may be tried. In about 60% of cases, the effusion is associated with a known disease, and the therapy should be targeted. When pericardiocentesis is performed in large effusions, prolonged pericardial drainage of up to 30 mL/24 h has been suggested to prevent recurrences, although evidence to support this is scarce. Prognosis is related to the aetiology, and idiopathic effusions may have a good prognosis especially if the effusion is mild to moderate.

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Brucato, Antonio, and Stefano Maggiolini. "Pericardial effusion." In ESC CardioMed, edited by Yehuda Adler. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198784906.003.0377_update_001.

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Actes de conférences sur le sujet "Non-simple fluid"

ARMFIELD, S. "Analysis of simple type algorithms on staggered and non-staggered grids." In 1st National Fluid Dynamics Conference. American Institute of Aeronautics and Astronautics, 1988. http://dx.doi.org/10.2514/6.1988-3528.

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Chang, Sin-Chung, Ching Loh, Sheng-Tao Yu, et al. "Robust and simple non-reflecting boundary conditions for the space-time conservation element and solution element method." In 13th Computational Fluid Dynamics Conference. American Institute of Aeronautics and Astronautics, 1997. http://dx.doi.org/10.2514/6.1997-2077.

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Vradis, George C. "Heat Transfer and Fluid Mechanics of Herschel-Bulkley Fluids." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0452.

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Abstract A comprehensive review of the heat transfer phenomena related to the flow of purely viscous non-Newtonian fluids exhibiting a yield stress in some simple and complex geometries is presented. Both attached and separated flows of Bingham and Herschel-Bulkley fluids are discussed. The presence of a yield-stress is shown to significantly impact the heat transfer and flow characteristics, as compared to those in the case of a Newtonian fluid, in particular in the cases where separation of the flow would be expected.

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van de Hoek, P. J. "A Simple and Accurate Description of Non-linear Fluid Leak-off in High-Permeability Fracturing." In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 2000. http://dx.doi.org/10.2118/63239-ms.

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Uhlíř, V., T. Bodnár, and M. Caggio. "Numerical Assessment of Stratification Influence in Simple Algebraic Turbulence Model." In Topical Problems of Fluid Mechanics 2022. Institute of Thermomechanics of the Czech Academy of Sciences, 2022. http://dx.doi.org/10.14311/tpfm.2022.022.

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This paper presents rst few results obtained using a newly developed test code aimed at validation and cross-comparison of turbulence models to be applied in environmental flows. A simple code based on nite di erence discretization is constructed to solve steady flows of incompresible non-homogeneous (variable denstity) fluids. For the rst tests a simple algebraic turbulence model was implemented, containing stability function depending on the stratification via the gradient Richardson number. Numerical tests were performed in order to explore the capabilities of the new code and to get some insight into its behavior under di erent stratification. The two-dimensional simulations were performed using immersed boundary method for the flow over low smooth hill. The resulting flow fields are compared for selected Richarson numbers ranging from stable up to unstable strati cation conditions.

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Kehler, Patrik, Nicolas Arenas, Ferdinand Meixner, et al. "Non-Newtonian Fluid Apparent Viscosity Correlation Between Experimental Data and Computational Fluid Dynamics Results, A Case Study From Automatic Transmission Fluid Filtration Industry." In ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-96025.

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Abstract Evidence of a Non-Newtonian behavior of automatic transmission fluid at sub-zero conditions was presented by several authors such as Khalil et. al. Accurate viscosity data of this fluid at cold conditions are critical, especially in the very competitive automotive industry. The proper design of a transmission fluid filter, this is, the calculation of the effective area of filtration media, depends heavily on this information. Technical difficulties of viscosity measurements by different shear rates at subzero conditions are driven by its cost and accuracy. In order to solve this issue, here is presented an alternative indirect viscosity measurement. By assuming Darcy’s law behavior on a fluid flow through a simple single flat sheet media configuration, for a given temperature and shear rate, apparent viscosity was calculated. This paper shows a correlation between Computational Fluid Dynamics (CFD) results and Test data. Effective shear rates in the porous media were obtained from fluid velocities at media face and porous media grade. It was observed a consistent shear thickening behavior. Results of applying this viscosity correlation, at the filter design stage, gave us a much better prediction of pressure drop performance in the actual filter test stage. An average of 40% difference between measured pressure drop and predicted pressure drop CFD was observed before applying this factor. The test data to CFD result difference was reduced to 10% average. In addition to this correlation on porous media flow, a simple analysis of internal flow through a circular tube was analyzed. The Darcy-Weisbach equation gave us a theoretically calculated pressure drop for a given flow rate, tube inner diameter, and length. Associated Computational Fluid Dynamics simulation was conducted at the same boundary flow conditions. Test data from this analysis were compared to theoretical calculations and this CFD results. This last analysis it was clearly observed the apparent viscosity dependence on shear rate. This is, for a given temperature and fluid, different flow rates showed pressure drop values that implied different fluid apparent viscosities. This work set the path to develop correcting factors on viscosity values for pressure drop hand calculations in the automatic transmission filter porous media. Filter designers can dimension the porous media effective area in a more precise fashion, especially for operating conditions in very cold conditions, where this non-Newtonian behavior is frequently observed. Also, transmission fluid makers could use this data to better develop oil blends to avoid this cold freeze characteristic.

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Sigrist, Jean Franc¸ois, Christian Laine, and Bernard Peseux. "Dynamic Analysis of a Coupled Fluid Structure Problem With Fluid Sloshing." In ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-3043.

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The present paper is related to the study of a generic linear coupled fluid/structure problem, in which an elastic beam is coupled with an inviscid fluid, with or without sloshing effects. A previous study [18] focussed on added mass effects; the present study is devoted to the coupling effects between fluid sloshing modes and structure with fluid added mass modes. The discretization of the coupled linear equations is performed with an axisymmetric fluid pressure formulated element, expanded in terms of a FOURIER series [14]. Various linear fluid model are taken into account (compressible, uncompressible, with or without sloshing) with the corresponding coupling matrix operator. The modal analysis is performed with a MATLAB program, using the non-symmetric LANCZOS algorithm [16]. The temporal analysis is performed with classical numerical techniques [10], in order to describe the dynamic response of the coupled problem subjected to a simple sine wave shock. The coupling effects are studied in various conditions represented by several non-dimensionnal numbers [12] such as the dynamic FROUDE number and the mass number, based on the geometrical and physical characteristics of the coupled problem. Comparisons are performed on the coupled problem with or without free surface modeling, with a model and temporal analysis. Coupling effects are exhibited and quantified; the numerical results obtained in the modal analysis here are in good agreement with other previous studies, carried out on different geometry [3,15]. The temporal analysis gives another point of view on the importance of the coupling effects and their importance at low dynamic FROUDE numbers. The present study gives and will be completed with a non-linear analysis (for both fluid and structure problems) of the coupled problem, using a finite element and finite volume explicit coupling procedure [19].

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Fullmer, William D., Alejandro Clausse, Avinash Vaidheeswaran, and Martin A. Lopez de Bertodano. "Numerical Solution of Wavy-Stratified Fluid-Fluid Flow With the One-Dimensional Two-Fluid Model: Stability, Boundedness, Convergence and Chaos." In ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fedsm2014-22121.

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In this paper the one-dimensional two-fluid model is used to dynamically simulate slightly inclined fluid-fluid flow in a rectangular channel. By that, it is specifically meant that the solutions exhibit a wavy pattern arising from the inherent instability of the model. The conditions and experimental data of Thorpe (1969) are used for comparison. The linear instability of the model is regularized, i.e., made well-posed, with surface tension and axial turbulent stress with a simple turbulent viscosity model. Nonlinear analysis in an infinite domain demonstrates for the first time one-dimensional two-fluid model chaotic behavior in addition to limit cycle behavior and asymptotic stability. The chaotic behavior is a consequence of the linear instability (the long wavelength energy source) the nonlinearity (the energy transfer mechanism) and the viscous dissipation (the short wavelength energy sink). Since the model is chaotic, solutions exhibit sensitive dependence on initial conditions which results in non-convergence of particular solutions with grid refinement. However, even chaotic problems have invariants and the ensemble averaged water void fraction amplitude spectrum is used to demonstrate convergence and make comparisons to the experimental data.

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Yoo, Sang-Yeoun, and Yogesh Jaluria. "Convective Transport in an Optical Fiber Coating Applicator for a Non-Newtonian Fluid." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79642.

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Convective transport in an optical fiber coating applicator and die system has been simulated for a non-Newtonian fluid. Low density Polyethylene (LDPE) is employed for the numerical analysis, though ultraviolet (UV) curable acrylates are commonly used, because of lack of property information for acrylates and similar behavior of these two materials. The equations governing fluid flow and heat transfer are transformed to obtain flow in a cylindrical domain. A SIMPLE-based algorithm is used with a non-uniform grid. In contrast to the isothermal case, streamlines for the non-Newtonian fluid are found to be quite different for various fiber speeds. The temperature level in the applicator is much higher for the Newtonian case, due to the larger fluid viscosity and associated viscous dissipation. The shear near the fiber is found to be lower for the Newtonian fluid. As expected, the effects become larger with increasing fiber speed. A very high temperature rise is observed in the die, regardless of fiber speed. This study focuses on the non-Newtonian effects during the coating process, and several interesting and important features, as compared to the Newtonian case, are observed.

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Hellum, Aren M., Ranjan Mukherjee, and Andrew J. Hull. "Dynamics of Pipes Conveying Fluid With a Non-Uniform Velocity Profile." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12858.

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Previous work on stability of fluid-conveying cantilever pipes assumed a uniform velocity profile for the conveyed fluid. In real fluid flows, the presence of viscosity leads to a sheared region near the wall. Earlier studies correctly note that viscous forces drop out of the system’s dynamics since the force of fluid shear on the wall is precisely balanced by pressure drop in the conveyed fluid. The effect of shear has therefore not been ignored in these studies. However, a uniform velocity profile assumes that the sheared region is infinitely thin. Prior analysis was extended to account for a fully developed non-uniform profile such as would be encountered in real fluid flows. A modified equation of motion was derived to account for the reduced momentum carried by the sheared fluid. Numerical analysis was carried out to determine a number of velocity profiles over the Reynolds number range of interest and a simple set of curve fits was used when finer discretization was required. Stability analysis of a pipe conveying fluid with these profiles was performed, and the results were compared to a uniform profile. The mass ratio, β, is the ratio of the fluid mass to the total system mass. At β = 0.2, the non-uniform case becomes unstable at a critical velocity, ucr, that is 5.4% lower than the uniform case. The critical frequency, fcr, is 0.36% higher than the uniform case. A more sensitive region exists near β = 0.32. There, the nonuniform velocity ucr is 23% lower than the uniform case and the non-uniform critical frequency fcr is 49% of the uniform case.

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Rapports d'organisations sur le sujet "Non-simple fluid"

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 hypotheses were not satisfied. However, it was found that correlations between the different levels were high enough to merit the use of multi-fidelity or control-variate approaches. It was also noted that MLMC methods could work for chaotic problems if the time window of analysis were chosen to be small enough. Future studies are proposed to examine this possibility.

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