Journal articles: 'Fluid physics'

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Ilyas, Ilyas, and An Nisaa Al Mu’min Liu. "Development of Physics Learning Tools Based on Contextual Teaching And Learning in a Remote Island Area." Jurnal Pendidikan Fisika 7, no. 1 (February 3, 2019): 1–8. http://dx.doi.org/10.26618/jpf.v7i1.1590.

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The research attempted to know the information on exam result Development of Physics learning tool for the students of eleven grade in Ende Island by using contextual teaching and learning in Fluid materials. It was viewed from the aspect of validity. Practicality and effectiveness. The kinds of research were development research that revers to ADDIE development model, analysis phase, design Development, implementation and evaluation. The Subject of the research was Physics learning device with approach learning model contextual teaching and learning to the students of Eleven Grade Ende Island Senior High School there are twenty nine students. Data collection was done in this research by using technique documentation. The data collection of research were done by using technique documentation, observations, survey and testing. The result showed that understanding the physics subject of fluid increased 82,7%, while students response showed positive response. This case showed that the reflection of the Egibilty of Development of Physics Learning tool based on Contextual Learning and teaching to increase the result of studying physic with Fluid materials.Keywords: Contextual Teaching and Learning, FluidaPenelitian ini bertujuan untuk mengetahui informasi hasil ujicoba perangkat pembelajaran fisika untuk peserta didik kelas X SMAN Pulau Ende dengan menggunakan model pembelajaran Contextual Teaching and Learning pada materi fluida ditinjau dari aspek kevalidan, kepraktisan dan keefektifan. Jenis penelitian ini adalah penelitian pengembangan yang mengacu model pengembangan ADDIE, dengan tahapan Analysis, Design, Development, Implementation, dan Evaluation. Subjek dalam penelitian ini adalah perangkat Pembelajaran fisika dengan pendekatan model pembelajran Contextual Teaching and Learning untuk peserta didik kelas XI SMAN Pulau Ende yang berjumlah 29 peserta didik. Pengumpulan data yang dilakukan dalam penelitian ini menggunakan teknik Dokumentasi, Observasi, dan Tes, Penyebaran Angket. Hasil penelitian menunjukkan bahwa pemahaman konsep fisika pokok bahasan fluida mengalami peningkatan 82,7%. Sedangkan respon siswa menunjukkan respon positif. Hal ini menunjukkan kelayakan pengembangan perangkat pembelajaran fisika Berbasis Contextual Teaching and Learning untuk meningkatkan hasil belajar fisika peserta didik materi fluidaKata kunci: Contextual Teaching and Learning, Fluida

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Ayub, Syahrial, Hikmawati Hikmawati, Ni Nyoman Sri Putu Verawati, and Muhammad Zuhdi. "PENGEMBANGAN KIT FLUIDA ALTERNATIF YANG BERASAL DARI SAMPAH ANORGANIK UNTUK PEMBELAJARAN FISIKA." ORBITA: Jurnal Kajian, Inovasi dan Aplikasi Pendidikan Fisika 5, no. 2 (November 28, 2019): 59. http://dx.doi.org/10.31764/orbita.v5i2.1185.

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ABSTRAKPenelitian ini bertujuan mengembangkan kit fluida alternatif pada pembelajaran fisika. Kit fluida alternatif ini dibuat dengan memanfaatkan sampah anorganik yang sudah tidak digunakan. Sampah anorganik adalah sampah yang dihasilkan dari bahan-bahan non-hayati, baik berupa produk sintetik maupun hasil proses teknologi pengolahan bahan tambang atau sumber daya alam dan tidak dapat diuraikan oleh alam, seperti botol plastik, tas plastik, kaleng dan lain-lain. Alat-alat yang terdapat pada kit fluida alternatif adalah alat peraga kapal selam sederhana, alat peraga aliran air, alat peraga pompa air tekanan udara, alat peraga barometer botol, alat peraga roket tekanan udara, dan alat peraga helikopter sederhana. Alat-alat peraga ini disusun dalam satu kotak dan mudah dibawa (portable). Kotak inilah yang disebut dengan kit fluida alternatif. Kit fluida ini diterapkan pada pembelajaran IPA (Fisika) di SD Negeri 6 Mataram. Respon peserta didik terhadap pembelajaran dengan integrasi kit fluida alternatif adalah 78 % menyatakan sangat setuju dan hanya 22 % yang menyatakan setuju dan tidak ada yang memilih tidak setuju. Berdasarkan data ini, disimpulkan bahwa pembelajaran IPA (fisika) di SD Negeri 6 Mataram dengan integrasi kit fluida alternatif mendapat respon baik dari peserta didik. Kata kunci: Kit Fluida Alternatif; Sampah Anorganik; Pembelajaran Fisika ABSTRACTThis research aims to develop alternative fluid kits in learning physics. This alternative fluid kit is made using inorganic waste that is not used. Inorganic waste is waste generated from non-biological materials, either in the form of synthetic products or the results of the processing technology of mining materials or natural resources and cannot be broken down by nature, such as plastic bottles, plastic bags, cans and others. The tools contained in the alternative fluid kit are simple submarine props, water flow props, air pressure water pump props, bottle barometer props, air pressure rocket props, and simple helicopter props. These props are arranged in one box and are easy and portable. This box is called the alternative fluid kit. This fluid kit is applied to learning science (physics) in SD Negeri 6 Mataram. Learners' responses to learning with the integration of alternative fluid kits is 78% stating strongly agree and only 22% who agree and no one chooses to disagree. Based on this data, it was concluded that learning science (physics) at SD Negeri 6 Mataram with the integration of alternative fluid kits received good responses from students. Keywords: Alternative Fluid Kits; Inorganic Waste; Physics Learning

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Elsaady, Wael, S. Olutunde Oyadiji, and Adel Nasser. "A review on multi-physics numerical modelling in different applications of magnetorheological fluids." Journal of Intelligent Material Systems and Structures 31, no. 16 (July 7, 2020): 1855–97. http://dx.doi.org/10.1177/1045389x20935632.

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Magnetorheological fluids involve multi-physics phenomena which are manifested by interactions between structural mechanics, electromagnetism and rheological fluid flow. In comparison with analytical models, numerical models employed for magnetorheological fluid applications are thought to be more advantageous, as they can predict more phenomena, more parameters of design, and involve fewer model assumptions. On that basis, the state-of-the-art numerical methods that investigate the multi-physics behaviour of magnetorheological fluids in different applications are reviewed in this article. Theories, characteristics, limitations and considerations employed in numerical models are discussed. Modelling of magnetic field has been found to be rather an uncomplicated affair in comparison to modelling of fluid flow field which is rather complicated. This is because, the former involves essentially one phenomenon/mechanism, whereas the latter involves a plethora of phenomena/mechanisms such as laminar versus turbulent rheological flow, incompressible versus compressible flow, and single- versus two-phase flow. Moreover, some models are shown to be still incapable of predicting the rheological nonlinear behaviour of magnetorheological fluids although they can predict the dynamic characteristics of the system.

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Cervantes, L. A., A. L. Benavides, and F. del Río. "Theoretical prediction of multiple fluid-fluid transitions in monocomponent fluids." Journal of Chemical Physics 126, no. 8 (February 28, 2007): 084507. http://dx.doi.org/10.1063/1.2463591.

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LIU, Jing. "Advanced Fluid Information. Magnetorheological Fluids: From Basic Physics to Application." JSME International Journal Series B 45, no. 1 (2002): 55–60. http://dx.doi.org/10.1299/jsmeb.45.55.

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Neumann, John. "Physics Curriculum Needs Fluid Mechanics." Physics Today 57, no. 6 (June 2004): 14. http://dx.doi.org/10.1063/1.1784257.

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Arter, W. "The physics of fluid turbulence." Computer Physics Communications 78, no. 1-2 (December 1993): 218–19. http://dx.doi.org/10.1016/0010-4655(93)90157-8.

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Fedina, Olga V., Arthur R. Zakinyan, and Irina M. Agibova. "Design of science laboratory sessions with magnetic fluids." International Journal of Mechanical Engineering Education 45, no. 4 (May 26, 2017): 349–59. http://dx.doi.org/10.1177/0306419017708644.

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Application of new achievements in science and technology to the physics laboratory sessions can ensure the advancement of physics education. One particular example of the technologies giving new opportunities in the design of physics laboratory works is the magnetic fluid. We describe the laboratory works within the scope of the general physic course for the undergraduate students. Principal feature of the laboratories presented is the use of magnetic fluids. It makes possible to design some creative laboratory works, which can help to develop skills in performing scientific experiments and to increase the understanding of the physical concepts. The sample consists of 120 third-grade university students from the Department of General and Theoretical Physics in the North Caucasus Federal University in Stavropol, Russia. These laboratories arouse students’ interest and contribute to the achievement of high quality of learning outcomes. We also show that such laboratories engage students’ interest in the scientific research work.

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Ramli, Z., Sunaryo, and V. Serevina. "E-Book Static Fluid and Dynamic Fluid Web-Based with a Problem-Based Learning Model to Improve Students Physics Problem-Solving Skills." Journal of Physics: Conference Series 2019, no. 1 (October 1, 2021): 012001. http://dx.doi.org/10.1088/1742-6596/2019/1/012001.

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Abstract This study aims to develop physics learning media in the form a static fluid and dynamic fluids e-book based on website with Problem Based Learning for students learning. The research subjects were 43 5th semester student of Jakarta State University. The research method used is Research and Development (R&D) research using the ADDIE development model (Analysis, Design, Development, Implementation, and Evaluation). The result of the instrument validation showed 90.31% for the validation of media experts, 94.94% for the validation of material experts, and 77.09% for the validation of learning experts. Based on the results of the validation of media experts, the material, and learning can show that this e-book in terms of several indicators used for validations has very decent criteria. Based on the result of trials to students, the results obtained an average score of all aspects of 88.39% with a very feasible interpretation and the impact on students Physics Problem Solving was measured. Based on the result of the effectiveness test show that there are differences in physics problem solving among students who use static fluids and dynamic fluids e-book based on Problem Based Learning and static fluids and dynamic fluids e-book based on Non-Problem Based Learning. Based on the D’Cohens test, the use of static fluids and dynamic fluids e-book based on Problem Based Learning made an effective contribution to increasing students Physics Problem Solving by 2.51 in the medium category, so it can be concluded that the developed e-book can increase the Physics Problem Solving students.

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Arrieta, Jorge, Julyan H. E. Cartwright, Emmanuelle Gouillart, Nicolas Piro, Oreste Piro, and Idan Tuval. "Geometric mixing." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 378, no. 2179 (August 3, 2020): 20200168. http://dx.doi.org/10.1098/rsta.2020.0168.

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Mixing fluids often involves a periodic action, like stirring one’s tea. But reciprocating motions in fluids at low Reynolds number, in Stokes flows where inertia is negligible, lead to periodic cycles of mixing and unmixing, because the physics, molecular diffusion excepted, is time reversible. So how can fluid be mixed in such circumstances? The answer involves a geometric phase. Geometric phases are found everywhere in physics as anholonomies, where after a closed circuit in the parameters, some system variables do not return to their original values. We discuss the geometric phase in fluid mixing: geometric mixing. This article is part of the theme issue ‘Stokes at 200 (part 2)’.

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Wang, Meng, Ali Mani, and Stanislav Gordeyev. "Physics and Computation of Aero-Optics." Annual Review of Fluid Mechanics 44, no. 1 (January 21, 2012): 299–321. http://dx.doi.org/10.1146/annurev-fluid-120710-101152.

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MORGADO, W. A. M., and E. VERNEK. "A SIMPLE EXAMPLE OF CLUSTERING FOR A GRANULAR GAS MODEL." International Journal of Modern Physics B 18, no. 20n21 (August 30, 2004): 2829–40. http://dx.doi.org/10.1142/s0217979204026202.

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We propose a model for two identical granular fluids separated by a piston that can present clustering (volume tending to zero) for a range of parameters. This model is based on point granular particles. For a convenient range of parameters, a granular fluid-cluster collapse is then possible and permits us to get an insight on the physics of granular clusters based on the behavior of the fluid phase itself.

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ZHANG, CHENGYUAN, XIAOYAN LIU, DAOYING XI, and QUANSHENG LIU. "AN ROCK-PHYSICS-BASED COMPLEX PORE-FLUID-DISTRIBUTION MODEL TO SEISMIC DYNAMICAL RESPONSE." International Journal of Modern Physics B 22, no. 09n11 (April 30, 2008): 1437–42. http://dx.doi.org/10.1142/s021797920804689x.

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It is very important to know how the reservoir rock and its fluid properties are linked to seismic dynamic response. Literatures show that there are a variety of rock-physics models such as the most famous Biot-Gassmann equation aimed at the relationship between seismic velocity and liquid saturation. Most of these models make a fundamental assumption of one fluid phase or homogeneous phase within the pore volume. In this paper, we discuss possible seismic velocities change in a two immiscible pore fluids (i.e. water-gas) saturated reservoir with patchy saturation distribution. It is found that P-wave velocity of a reservoir rock with the same saturation but different pore fluid distribution exhibits noticeable variation and deviate overall from Gassmann's results. We use DEM theory to explain this phenomenon. It belongs to hybrid approach in rock-physics modeling and can handle complex pore-fluid-distribution cases. Based on the modeling study, we found that various fluid-distribution models may significantly affect the modulus and P-wave velocity. The seismic reflection time, amplitude and phase characteristics may change with the choice of pore-fluid-distribution models. Relevant rock mechanical experiments indicate the same trend of seismic responses. It also be proven by seismic reservoir monitoring experiment (time lapse study) that incorrect conclusion may be drawn about the strong seismic reflection in pure Utsira Sand if the microscopic pore-fluid-distribution effects are not taken into account.

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Chu, Mengyu, Lingjie Liu, Quan Zheng, Erik Franz, Hans-Peter Seidel, Christian Theobalt, and Rhaleb Zayer. "Physics informed neural fields for smoke reconstruction with sparse data." ACM Transactions on Graphics 41, no. 4 (July 2022): 1–14. http://dx.doi.org/10.1145/3528223.3530169.

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High-fidelity reconstruction of dynamic fluids from sparse multiview RGB videos remains a formidable challenge, due to the complexity of the underlying physics as well as the severe occlusion and complex lighting in the captured data. Existing solutions either assume knowledge of obstacles and lighting, or only focus on simple fluid scenes without obstacles or complex lighting, and thus are unsuitable for real-world scenes with unknown lighting conditions or arbitrary obstacles. We present the first method to reconstruct dynamic fluid phenomena by leveraging the governing physics (ie, Navier -Stokes equations) in an end-to-end optimization from a mere set of sparse video frames without taking lighting conditions, geometry information, or boundary conditions as input. Our method provides a continuous spatio-temporal scene representation using neural networks as the ansatz of density and velocity solution functions for fluids as well as the radiance field for static objects. With a hybrid architecture that separates static and dynamic contents apart, fluid interactions with static obstacles are reconstructed for the first time without additional geometry input or human labeling. By augmenting time-varying neural radiance fields with physics-informed deep learning, our method benefits from the supervision of images and physical priors. Our progressively growing model with regularization further disentangles the density-color ambiguity in the radiance field, which allows for a more robust optimization from the given input of sparse views. A pretrained density-to-velocity fluid model is leveraged in addition as the data prior to avoid suboptimal velocity solutions which underestimate vorticity but trivially fulfill physical equations. Our method exhibits high-quality results with relaxed constraints and strong flexibility on a representative set of synthetic and real flow captures. Code and sample tests are at https://people.mpi-inf.mpg.de/~mchu/projects/PI-NeRF/.

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HUBENY, VERONIKA E., MUKUND RANGAMANI, SHIRAZ MINWALLA, and MARK VAN RAAMSDONK. "THE FLUID–GRAVITY CORRESPONDENCE: THE MEMBRANE AT THE END OF THE UNIVERSE." International Journal of Modern Physics D 17, no. 13n14 (December 2008): 2571–76. http://dx.doi.org/10.1142/s0218271808014084.

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We establish an explicit connection between the evolution of generic inhomogeneous black brane solutions in asymptotically AdS space–times and the evolution of relativistic conformal fluids in one lower dimension. Specifically, given any solution to a particular set of fluid-dynamical equations, one can construct an inhomogeneous black brane solution with a regular event horizon. This connection is reminiscent of the membrane paradigm for black holes; in our case the dynamics of the entire space–time is encoded in a fluid living at the boundary. This fluid–gravity correspondence leads to interesting implications for both gravitational physics and fluid dynamics.

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Kavokine, Nikita, Roland R. Netz, and Lydéric Bocquet. "Fluids at the Nanoscale: From Continuum to Subcontinuum Transport." Annual Review of Fluid Mechanics 53, no. 1 (January 5, 2021): 377–410. http://dx.doi.org/10.1146/annurev-fluid-071320-095958.

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Nanofluidics has firmly established itself as a new field in fluid mechanics, as novel properties have been shown to emerge in fluids at the nanometric scale. Thanks to recent developments in fabrication technology, artificial nanofluidic systems are now being designed at the scale of biological nanopores. This ultimate step in scale reduction has pushed the development of new experimental techniques and new theoretical tools, bridging fluid mechanics, statistical mechanics, and condensed matter physics. This review is intended as a toolbox for fluids at the nanometer scale. After presenting the basic equations that govern fluid behavior in the continuum limit, we show how these equations break down and new properties emerge in molecular-scale confinement. A large number of analytical estimates and physical arguments are given to organize the results and different limits.

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FUJITA, TOYOHISA, YASUHISA WADA, GORO OBINATA, YOICHI AKAGAMI, SHINZO NISHIMURA, and YUJI OGASAWARA. "COMPARISON OF FREQUENCY CHARACTERISTICS IN A DAMPER USING MAGNETIC FLUID, ER FLUID DISPERSING SMECTITE, AND MIXED ER MAGNETIC FLUID." International Journal of Modern Physics B 10, no. 23n24 (October 30, 1996): 3001–10. http://dx.doi.org/10.1142/s0217979296001446.

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This paper presents a new type of damper using electro-rheological (ER) magnetic fluid for improving magnetic fluid damper and ER fluid damper. Silicone oil based magnetic fluid dispersing 10 nm size of magnetite, silicone oil based ER fluid dispersing 2 nm to 50 nm size of smectite and a mixture, that is, ER magnetic fluid have been used in a piston type damper. Dynamic visco-elasticities of these fluids have been measured by considering chain (cluster) formations. Next, frequency characteristics of transmissibility (magnification factor) and phase in damper have been compared with those fluids under magnetic field, electric field and both fields. The Voigt or Maxwell model can be applied in those dampers depending on amplitude. ER magnetic fluid has showed the decrease of amplitude ratios at resonance point and higher frequency at any amplitude under both magnetic and electric fields as low-pass filter.

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Bourouiba, Lydia. "The Fluid Dynamics of Disease Transmission." Annual Review of Fluid Mechanics 53, no. 1 (January 5, 2021): 473–508. http://dx.doi.org/10.1146/annurev-fluid-060220-113712.

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For an infectious disease such as the coronavirus disease 2019 (COVID-19) to spread, contact needs to be established between an infected host and a susceptible one. In a range of populations and infectious diseases, peer-to-peer contact modes involve complex interactions of a pathogen with a fluid phase, such as isolated complex fluid droplets or a multiphase cloud of droplets. This is true for exhalations including coughs or sneezes in humans and animals, bursting bubbles leading to micron-sized droplets in a range of indoor and outdoor settings, or impacting raindrops and airborne pathogens in foliar diseases transferring pathogens from water to air via splashes. Our mechanistic understanding of how pathogens actually transfer from one host or reservoir to the next remains woefully limited, with the global consequences that we are all experiencing with the ongoing COVID-19 pandemic. This review discusses the emergent area of the fluid dynamics of disease transmission. It highlights a new frontier and the rich multiscale fluid physics, from interfacial to multiphase and complex flows, that govern contact between an infected source and a susceptible target in a range of diseases.

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Legros, J. C., and P. Queeckers. "Fluid physics experiments under microgravity conditions." Advances in Space Research 8, no. 12 (January 1988): 69–76. http://dx.doi.org/10.1016/0273-1177(88)90007-5.

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Peterson, Carl W. "The Fluid Physics of Parachut Inflation." Physics Today 46, no. 8 (August 1993): 32–39. http://dx.doi.org/10.1063/1.881361.

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Sapsis, Themistoklis P. "Statistics of Extreme Events in Fluid Flows and Waves." Annual Review of Fluid Mechanics 53, no. 1 (January 5, 2021): 85–111. http://dx.doi.org/10.1146/annurev-fluid-030420-032810.

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Extreme events in fluid flows, waves, or structures interacting with them are critical for a wide range of areas, including reliability and design in engineering, as well as modeling risk of natural disasters. Such events are characterized by the coexistence of high intrinsic dimensionality, complex nonlinear dynamics, and stochasticity. These properties severely restrict the application of standard mathematical approaches, which have been successful in other areas. This review focuses on methods specifically formulated to deal with these properties and it is structured around two cases: ( a) problems where an accurate but expensive model exists and ( b) problems where a small amount of data and possibly an imperfect reduced-order model that encodes some physics about the extremes can be employed.

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Wang, Xiaokun, Yanrui Xu, Xiaojuan Ban, Sinuo Liu, and Yuting Xu. "A Unified Multiple-Phase Fluids Framework Using Asymmetric Surface Extraction and the Modified Density Model." Symmetry 11, no. 6 (June 2, 2019): 745. http://dx.doi.org/10.3390/sym11060745.

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Multiple-phase fluids’ simulation and 3D visualization comprise an important cooperative visualization subject between fluid dynamics and computer animation. Interactions between different fluids have been widely studied in both physics and computer graphics. To further the study in both areas, cooperative research has been carried out; hence, a more authentic fluid simulation method is required. The key to a better multiphase fluid simulation result is surface extraction. Previous works usually have problems in extracting surfaces with unnatural fluctuations or detail missing. Gaps between different phases also hinder the reality of simulation. In this paper, we propose a unified surface extraction approach integrated with a modified density model for the particle-based multiphase fluid simulation. We refine the original asymmetric smoothing kernel used in the color field and address a binary tree scheme for surface extraction. Besides, we employ a multiphase fluid framework with modified density to eliminate density deviation between different fluids. With the methods mentioned above, our approach can effectively reconstruct the fluid surface for particle-based multiphase fluid simulation. It can also resolve the issue of overlaps and gaps between different fluids, which has widely existed in former methods for a long time. The experiments carried out in this paper show that our approach is able to have an ideal fluid surface condition and have good interaction effects.

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Terrones, Guillermo, and Tamra Heberling. "Rayleigh–Taylor instability at spherical interfaces between viscous fluids: The fluid/fluid interface." Physics of Fluids 32, no. 9 (September 1, 2020): 094105. http://dx.doi.org/10.1063/5.0018601.

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Guzmán, Eduardo, Irene Abelenda-Núñez, Armando Maestro, Francisco Ortega, Andreas Santamaria, and Ramón G. Rubio. "Particle-laden fluid/fluid interfaces: physico-chemical foundations." Journal of Physics: Condensed Matter 33, no. 33 (June 29, 2021): 333001. http://dx.doi.org/10.1088/1361-648x/ac0938.

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Hopkins, Cameron C., and John R. de Bruyn. "The velocity field due to an oscillating plate in an Oldroyd-B fluid." Canadian Journal of Physics 92, no. 6 (June 2014): 533–38. http://dx.doi.org/10.1139/cjp-2013-0334.

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Analytical solutions to the Navier–Stokes equations for non-Newtonian fluids are rare and tend to be mathematically complicated. We analytically solve Stokes’ second problem — the flow due to an infinite plate oscillating in-plane — for a viscoelastic fluid described by the Oldroyd-B constitutive relation, using mathematical techniques familiar to third- or fourth-year undergraduate students in physics, engineering, or mathematics. The solution is compared to the well-known solution of Stokes’ second problem for a Newtonian fluid to illustrate the effects of fluid elasticity on the flow, and we provide a straightforward interpretation of these effects in terms of the quality factor of the oscillations. This calculation provides a mathematically accessible introduction to non-Newtonian fluid flow that illustrates important physical effects while limiting the mathematical complications.

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Grana, Dario. "Bayesian rock-physics inversion with Kumaraswamy prior models." GEOPHYSICS 87, no. 3 (April 11, 2022): M87—M97. http://dx.doi.org/10.1190/geo2021-0469.1.

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The prediction of rock and fluid volumetric fractions from elastic attributes often is referred to as petrophysical or rock-physics inversion because it requires rock-physics models to map petrophysical properties into geophysical variables, such as velocities and density. Bayesian approaches are suitable for rock-physics inverse problems because the solution, expressed in the form of a probability distribution, can represent the uncertainty of the model predictions due to the errors in the measured data. Bayesian inverse methods often rely on Gaussian prior distributions for their analytical tractability. However, Gaussian distributions are theoretically not applicable to rock and fluid volumetric fractions because, by definition, they are nonzero on the entire set of real numbers, whereas rock and fluid volumetric fractions are bounded between zero and one. The proposed rock physics inversion is based on a Bayesian approach that assumes Kumaraswamy probability density functions for the prior distribution to model double-bounded nonsymmetric continuous random variables between zero and one. The results of the Bayesian inverse problem are the pointwise probability distributions of the rock and fluid volumetric fractions conditioned on the seismic attributes. In the first application, the method is validated using synthetic well-log data for the soft sand and stiff rock-physics models with comparisons with several prior models. In the second application, the method is applied to a 2D real data set to obtain the posterior distribution, the maximum a posteriori, and the confidence intervals of porosity, mineral volumes, and fluid saturations. The most likely model of rock and fluid properties estimated from the posterior distribution assuming a Kumaraswamy prior model finds higher accuracies compared to the corresponding results obtained with a Gaussian prior model.

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Christov, Ivan C. "Soft hydraulics: from Newtonian to complex fluid flows through compliant conduits." Journal of Physics: Condensed Matter 34, no. 6 (November 18, 2021): 063001. http://dx.doi.org/10.1088/1361-648x/ac327d.

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Abstract Microfluidic devices manufactured from soft polymeric materials have emerged as a paradigm for cheap, disposable and easy-to-prototype fluidic platforms for integrating chemical and biological assays and analyses. The interplay between the flow forces and the inherently compliant conduits of such microfluidic devices requires careful consideration. While mechanical compliance was initially a side-effect of the manufacturing process and materials used, compliance has now become a paradigm, enabling new approaches to microrheological measurements, new modalities of micromixing, and improved sieving of micro- and nano-particles, to name a few applications. This topical review provides an introduction to the physics of these systems. Specifically, the goal of this review is to summarize the recent progress towards a mechanistic understanding of the interaction between non-Newtonian (complex) fluid flows and their deformable confining boundaries. In this context, key experimental results and relevant applications are also explored, hand-in-hand with the fundamental principles for their physics-based modeling. The key topics covered include shear-dependent viscosity of non-Newtonian fluids, hydrodynamic pressure gradients during flow, the elastic response (deformation and bulging) of soft conduits due to flow within, the effect of cross-sectional conduit geometry on the resulting fluid–structure interaction, and key dimensionless groups describing the coupled physics. Open problems and future directions in this nascent field of soft hydraulics, at the intersection of non-Newtonian fluid mechanics, soft matter physics, and microfluidics, are noted.

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Franta, M., J. Málek, and K. R. Rajagopal. "On steady flows of fluids with pressure– and shear–dependent viscosities." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 461, no. 2055 (March 8, 2005): 651–70. http://dx.doi.org/10.1098/rspa.2004.1360.

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There are many technologically important problems such as elastohydrodynamics which involve the flows of a fluid over a wide range of pressures. While the density of the fluid remains essentially constant during these flows whereby the fluid can be approximated as being incompressible, the viscosity varies significantly by several orders of magnitude. It is also possible that the viscosity of such fluids depends on the shear rate. Here we consider the flows of a class of incompressible fluids with viscosity that depends on the pressure and shear rate. We establish the existence of weak solutions for the steady flows of such fluids subjected to homogeneous Dirichlet boundary conditions and to specific body forces that are not necessarily assumed to be small. A novel aspect of the study is the manner in which we treat the pressure that allows us to establish its compactness, as well as that of the velocity gradient. The method draws upon the physics of the problem, namely that the notion of incompressibility is an idealization that is attained by letting the compressibility of the fluid to tend to zero.

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Mueller, Jan, Akira Kyotani, and Hans-Georg Matuttis. "Grid-algorithm improvements for dense suspensions of discrete element particles in finite element fluid simulations." EPJ Web of Conferences 249 (2021): 09006. http://dx.doi.org/10.1051/epjconf/202124909006.

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For homogeneous systems like classical fluid dynamics and structural mechanics, finite element method (FEM) grid generation has reached a mature state. On the other hand, for multi-physics-problems like fluids with a high density of immersed particles, many researchers may not even be aware of the types of instabilities which may be triggered by unsuitable meshes. We review common types of grid generation, point out previously unrecognised types of instabilities for particles in fluids as well as remedies to obtain particle-fluid simulations with higher stability and fewer redundant degrees of freedom.

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Imaniar, Berliana Oni, Supeno Supeno, and Albertus Djoko Lesmono. "ARGUMENTATION OF SENIOR HIGH SCHOOL STUDENTS ON PHYSICS INSTRUCTION BASED INQUIRY." COMPTON: Jurnal Ilmiah Pendidikan Fisika 7, no. 1 (June 29, 2020): 35. http://dx.doi.org/10.30738/cjipf.v7i1.6625.

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Argumentation as the one of important skills must be included in the science learning. With argumentation skills, students can show their opinion include evidence and justification logically. Argumentation is important for students, but it seldom integrate in physic learning based inquiry. Participation of students who decrease in the learning can influence to argumentation’s ability of students. Physic learning based inquiry which include argumentation section can grow up the action students to give argumentation. Component of argumentation’s ability are evidence and justification for argument, counter argument, and rebuttal. This research is conduct for three meetings on the fluid static’s chapter in Senior High School of one Gambiran. Students’ argumentation skills measure from argumentation section and students’ worksheets has consisted component’s of argumentation. Purpose of this research is describe of students’ argumentation skills on physics instruction based inquiry. Result of this research is shown that students’ argumentation skills increase on last meeting of physics instruction. Participation of students give argumentation influenced by topic of the problems. Keywords: argumentation, participation, inquiry, physic, learning

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Jumper, Eric J., and Stanislav Gordeyev. "Physics and Measurement of Aero-Optical Effects: Past and Present." Annual Review of Fluid Mechanics 49, no. 1 (January 3, 2017): 419–41. http://dx.doi.org/10.1146/annurev-fluid-010816-060315.

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Calderón, H. E., L. M. Rada, and J. S. De Plaza. "Bottom rack intake improvement as a fluid physics application through a computational fluid dynamics model." Journal of Physics: Conference Series 2118, no. 1 (November 1, 2021): 012003. http://dx.doi.org/10.1088/1742-6596/2118/1/012003.

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Abstract This research focuses on improving the hydraulic behavior of a traditionally design bottom rack intake, from variations in roughness parameters, free height, and the inclusion of chamfers, establishing a contribution to the contrast between classical physics and the physics that takes over the partial resolution of the Navier-Stokes equations. To make possible the structure in OpenFOAM, it is necessary to use the geometric tool Salome-Meca, as well as a meshing tool (snappyHexMesh), and the InterFOAM solver in the processing stage. In the same way, through the turbulence model (K-E) local effects are evidenced in the Fluid-Structure interaction, as well as the identification of events and the development of the phenomenon of vorticity. The results show the improvement presented in some areas of the structure from the stabilization of the water flow through of the fluid-structure interaction change, the modification of the geometry and roughness, minimizing the presence of vertical vortices, cavitation, and surrounding areas. This allows us to conclude that traditional hydraulic do not consider the real physical flow behavior within the structure and neither the subsequent phenomena that develop, establishing as a starting point the need to rethink the design of the bottom rack intakes.

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Koswara, Atep, and Mundilarto Mundilarto. "Pengembangan handout fluida dinamik terintegrasi metakognisi untuk meningkatkan kemampuan aplikasi siswa SMA dan MA." Jurnal Inovasi Pendidikan IPA 4, no. 1 (April 23, 2018): 11–25. http://dx.doi.org/10.21831/jipi.v4i1.6193.

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Penelitian ini bertujuan untuk mengembangkan handout fluida dinamik terintegrasi metakognisi. Jenis penelitian ini adalah penelitian dan pengembangan. Subyek penelitian ini adalah guru fisika dan siswa kelas XI IPA pada SMAN 8 Yogyakarta dan MAN Laboratorium UIN Yogyakarta. Instrumen yang digunakan berupa lembar penilaian kualitas handout oleh ahli pendidikan fisika dan guru fisika, lembar tanggapan siswa terhadap kualitas handout, tes awal dan tes akhir kemampuan menerapkan prinsip fluida dinamik, lembar tanggapan guru fisika dan siswa terhadap penggunaan handout. Teknik analisis data yang digunakan adalah analisis deskriptif, analisis gain score, dan analisis varians dua jalur. Hasil penilaian ahli dan guru menunjukkan bahwa handout memiliki kualitas yang sangat baik. Hasil uji lapangan menunjukkan bahwa handout memiliki kualitas yang baik menurut tanggapan siswa, penggunaan handout menghasilkan peningkatan kemampuan menerapkan prinsip fluida dinamik siswa SMA dan MA yang signifikan, dan handout sangat praktis digunakan menurut guru fisika SMA dan praktis menurut siswa SMA. Developing handout of fluid dynamics integrated by metacognition to improve application ability of SMA and MA students AbstractThis research aims to develop a handout of fluid dynamics integrated by metacognition. This type of research is research and development. The subjects of this study were a SMA/MA physics teacher and XI IPA grade students at SMAN 8 Yogyakarta and MAN Laboratory UIN Yogyakarta. The instruments used in this study were in the form of quality assessment sheet of teaching materials handout by physics education experts and SMA/MA physics teachers, students response sheet on the quality of teaching materials handout, initial and final test of application competence of the principles of fluid dynamics, and SMA/MA physics teacher and students response sheet on the use of the teaching materials handout. The data analysis technique used in this research was descriptive analysis, analysis of gain score, and two way analysis of variance. The expert and physics teacher assessment results show that the handout developed has a very good quality. Field testing results show that the handout developed has good quality according to student responses, the use of this handout can result significant improvement on the students ability to apply the principles of fluid dynamics at SMAN 8 Yogyakarta and MAN Laboratory UIN Yogyakarta, and the use of the handout is very practical according to SMA physics teacher and practical according to SMA students.

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Devakar, M., Ankush Raje, and Shubham Hande. "Unsteady Flow of Couple Stress Fluid Sandwiched Between Newtonian Fluids Through a Channel." Zeitschrift für Naturforschung A 73, no. 7 (July 26, 2018): 629–37. http://dx.doi.org/10.1515/zna-2017-0434.

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AbstractThe aim of this article is to study the unsteady flow of immiscible couple stress fluid sandwiched between Newtonian fluids through a horizontal channel. The fluids and plates are initially at rest. At an instant of time, a constant pressure gradient is applied along the horizontal direction to generate the flow. The time-dependent partial differential equations are solved numerically using the finite difference method. The continuity of velocities and shear stresses at the fluid-fluid interfaces has been considered. The obtained results are displayed through graphs and are discussed for various fluid parameters pertaining the flow. The volume flow rate is also obtained numerically for diverse fluid parameters and is presented through a table. It is noticed that fluid velocities increased with time and reached a steady state after a certain time level. Also, the presence of couple stresses reduced the fluid velocities. Volume flow rate increased with Reynolds number and is reduced by increase of ratio of viscosities.

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Cates, M. E., J. C. Desplat, P. Stansell, A. J. Wagner, K. Stratford, R. Adhikari, and I. Pagonabarraga. "Physical and computational scaling issues in lattice Boltzmann simulations of binary fluid mixtures." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 363, no. 1833 (August 5, 2005): 1917–35. http://dx.doi.org/10.1098/rsta.2005.1619.

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We describe some scaling issues that arise when using lattice Boltzmann (LB) methods to simulate binary fluid mixtures—both in the presence and absence of colloidal particles. Two types of scaling problem arise: physical and computational. Physical scaling concerns how to relate simulation parameters to those of the real world. To do this effectively requires careful physics, because (in common with other methods) LB cannot fully resolve the hierarchy of length, energy and time-scales that arise in typical flows of complex fluids. Care is needed in deciding what physics to resolve and what to leave unresolved, particularly when colloidal particles are present in one or both of two fluid phases. This influences steering of simulation parameters such as fluid viscosity and interfacial tension. When the physics is anisotropic (for example, in systems under shear) careful adaptation of the geometry of the simulation box may be needed; an example of this, relating to our study of the effect of colloidal particles on the Rayleigh–Plateau instability of a fluid cylinder, is described. The second and closely related set of scaling issues are computational in nature: how do you scale-up simulations to very large lattice sizes? The problem is acute for systems undergoing shear flow. Here one requires a set of blockwise co-moving frames to the fluid, each connected to the next by a Lees–Edwards like boundary condition. These matching planes lead to small numerical errors whose cumulative effects can become severe; strategies for minimizing such effects are discussed.

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Makarynska, Dina, Boris Gurevich, Jyoti Behura, and Mike Batzle. "Fluid substitution in rocks saturated with viscoelastic fluids." GEOPHYSICS 75, no. 2 (March 2010): E115—E122. http://dx.doi.org/10.1190/1.3360313.

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Heavy oils have high densities and extremely high viscosities, and they exhibit viscoelastic behavior. Traditional rock physics based on Gassmann theory does not apply to materials saturated with viscoelastic fluids. We use an effective-medium approach known as coherent potential approximation (CPA) as an alternative fluid-substitution scheme for rocks saturated with viscoelastic fluids. Such rocks are modeled as solids with elliptical fluid inclusions when fluid concentration is small and as suspensions of solid particles in the fluid when the solid concentration is small. This approach is consistent with concepts of percolation and critical porosity, and it allows one to model sandstones and unconsolidated sands.We model the viscoelastic properties of a heavy-oil-saturated rock sample using CPA and a measured frequency-dependent complex shear modulus of the heavy oil. Comparison of modeled results with measured properties of the heavy-oil rock reveals a large discrepancy over a range of frequencies and temperatures. We modify the CPA scheme to account for the effect of binary pore structure by introducing a compliant porosity term. This dramatically improves the predictions. The predicted values of the effective shear modulus of the rock are in good agreement with laboratory data for the range of frequencies and temperatures. This confirms that our scheme realistically estimates the frequency- and temperature-dependent properties of heavy-oil rocks and can be used as an approximate fluid-substitution approach for rocks saturated with viscoelastic fluids.

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Sandberg, Richard D., and Vittorio Michelassi. "Fluid Dynamics of Axial Turbomachinery: Blade- and Stage-Level Simulations and Models." Annual Review of Fluid Mechanics 54, no. 1 (January 5, 2022): 255–85. http://dx.doi.org/10.1146/annurev-fluid-031221-105530.

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The current generation of axial turbomachines is the culmination of decades of experience, and detailed understanding of the underlying flow physics has been a key factor for achieving high efficiency and reliability. Driven by advances in numerical methods and relentless growth in computing power, computational fluid dynamics has increasingly provided insights into the rich fluid dynamics involved and how it relates to loss generation. This article presents some of the complex flow phenomena occurring in bladed components of gas turbines and illustrates how simulations have contributed to their understanding and the challenges they pose for modeling. The interaction of key aerodynamic features with deterministic unsteadiness, caused by multiple blade rows, and stochastic unsteadiness, i.e., turbulence, is discussed. High-fidelity simulations of increasingly realistic configurations and models improved with help of machine learning promise to further grow turbomachinery performance and reliability and, thus, help fluid mechanics research have a greater industrial impact.

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Marusic, Ivan, and Jason P. Monty. "Attached Eddy Model of Wall Turbulence." Annual Review of Fluid Mechanics 51, no. 1 (January 5, 2019): 49–74. http://dx.doi.org/10.1146/annurev-fluid-010518-040427.

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Modeling wall turbulence remains a major challenge, as a sufficient physical understanding of these flows is still lacking. In an effort to move toward a physics-based model, A.A. Townsend introduced the hypothesis that the dominant energy-containing motions in wall turbulence are due to large eddies attached to the wall. From this simple hypothesis, the attached eddy model evolved, which has proven to be highly effective in predicting velocity statistics and providing a framework for interpreting the energy-containing flow physics at high Reynolds numbers. This review summarizes the hypothesis itself and the modeling attempts made thereafter, with a focus on the validity of the model's assumptions and its limitations. Here, we review studies on this topic, which have markedly increased in recent years, highlighting refinements, extensions, and promising future directions for attached eddy modeling.

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Duprat, C. "Moisture in Textiles." Annual Review of Fluid Mechanics 54, no. 1 (January 5, 2022): 443–67. http://dx.doi.org/10.1146/annurev-fluid-030121-034728.

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The interactions of textiles with moisture have been thoroughly studied in textile research, while fluid mechanists and soft matter physicists have partially investigated the underlying physics phenomena. A description of liquid morphologies in fibrous assemblies allows one to characterize the associated capillary forces and their impact on textiles, and to organize their complex moisture transport dynamics. This review gathers some of the common features and fundamental mechanisms at play in textile–liquid interactions, with selected examples ranging from knitted fabrics to nonwoven paper sheets, associated with experiments on model systems.

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Squires, Todd M., and Stephen R. Quake. "Microfluidics: Fluid physics at the nanoliter scale." Reviews of Modern Physics 77, no. 3 (October 6, 2005): 977–1026. http://dx.doi.org/10.1103/revmodphys.77.977.

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Santhosh, Sanju. "Physics of Interaction of Two Fluid Jets." International Journal of Mechanical Engineering 4, no. 9 (September 25, 2017): 10–13. http://dx.doi.org/10.14445/23488360/ijme-v4i9p103.

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Liu, Qian, Xingyao Yin, and Chao Li. "Fluid discrimination based on rock physics templates." Journal of Geophysics and Engineering 12, no. 5 (August 26, 2015): 830–38. http://dx.doi.org/10.1088/1742-2132/12/5/830.

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Hakim, A., and U. Shumlak. "Two-fluid physics and field-reversed configurations." Physics of Plasmas 14, no. 5 (May 2007): 055911. http://dx.doi.org/10.1063/1.2742570.

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FUKANO, Tohru. "Physics of Thermo : Fluid Phenomena at Interface." Transactions of the Japan Society of Mechanical Engineers Series B 68, no. 671 (2002): 1833. http://dx.doi.org/10.1299/kikaib.68.1833.

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Tonon, Thomas. "Fluid dynamics approach to free reed physics." Journal of the Acoustical Society of America 142, no. 4 (October 2017): 2570. http://dx.doi.org/10.1121/1.5014394.

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Yang, Yi-feng. "Two-fluid model for heavy electron physics." Reports on Progress in Physics 79, no. 7 (May 23, 2016): 074501. http://dx.doi.org/10.1088/0034-4885/79/7/074501.

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Molerus, O. "Fundamentals of physics of fluid flow reconsidered." Heat and Mass Transfer 45, no. 2 (June 13, 2008): 247–54. http://dx.doi.org/10.1007/s00231-008-0411-7.

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Bates, Paul D. "Flood Inundation Prediction." Annual Review of Fluid Mechanics 54, no. 1 (January 5, 2022): 287–315. http://dx.doi.org/10.1146/annurev-fluid-030121-113138.

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Every year flood events lead to thousands of casualties and significant economic damage. Mapping the areas at risk of flooding is critical to reducing these losses, yet until the last few years such information was available for only a handful of well-studied locations. This review surveys recent progress to address this fundamental issue through a novel combination of appropriate physics, efficient numerical algorithms, high-performance computing, new sources of big data, and model automation frameworks. The review describes the fluid mechanics of inundation and the models used to predict it, before going on to consider the developments that have led in the last five years to the creation of the first true fluid mechanics models of flooding over the entire terrestrial land surface.

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Shelley, Michael J. "The Dynamics of Microtubule/Motor-Protein Assemblies in Biology and Physics." Annual Review of Fluid Mechanics 48, no. 1 (January 3, 2016): 487–506. http://dx.doi.org/10.1146/annurev-fluid-010814-013639.

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Janocha, H., B. Rech, and R. Bölter. "PRACTICE-RELEVANT ASPECTS OF CONSTRUCTING ER FLUID ACTUATORS." International Journal of Modern Physics B 10, no. 23n24 (October 30, 1996): 3243–55. http://dx.doi.org/10.1142/s0217979296001690.

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The flow resistance of electrorheological fluids (ER fluids) can be controlled by applying electric fields. Thus, ER fluids are suitable for the application in actuators, using high-voltage sources for the generation of the field. The behaviour of an ER fluid actuator not only depends on the properties of the individual actuator components (ER fluid, energy transducer and energy source) but especially on their combined efforts as a system. Based on a possible scheme for the design of ER fluid actuators, this paper presents important practice-relevant aspects of a systematic actuator construction. Here the behaviour of a commercial ER suspension is examined and compared to a homogeneous ER fluid without yield point using a rotational viscometer and a flow-mode damper realized at the Laboratory of Process Automation (LPA) of the University of Saarland.

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Journal articles on the topic 'Fluid physics'

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