Academic literature on the topic 'Propagative front'

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Journal articles on the topic "Propagative front"

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Svetlizky, Ilya, Daniel Pino Muñoz, Mathilde Radiguet, David S. Kammer, Jean-François Molinari, and Jay Fineberg. "Properties of the shear stress peak radiated ahead of rapidly accelerating rupture fronts that mediate frictional slip." Proceedings of the National Academy of Sciences 113, no. 3 (2016): 542–47. http://dx.doi.org/10.1073/pnas.1517545113.

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We study rapidly accelerating rupture fronts at the onset of frictional motion by performing high-temporal-resolution measurements of both the real contact area and the strain fields surrounding the propagating rupture tip. We observe large-amplitude and localized shear stress peaks that precede rupture fronts and propagate at the shear-wave speed. These localized stress waves, which retain a well-defined form, are initiated during the rapid rupture acceleration phase. They transport considerable energy and are capable of nucleating a secondary supershear rupture. The amplitude of these locali
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Manucharyan, Georgy E., and Mary-Louise Timmermans. "Generation and Separation of Mesoscale Eddies from Surface Ocean Fronts." Journal of Physical Oceanography 43, no. 12 (2013): 2545–62. http://dx.doi.org/10.1175/jpo-d-13-094.1.

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Abstract This study is motivated by Arctic Ocean observations of sub–mixed layer eddies found at large distances from their assumed formation region of a surface ocean front. Eddy formation is explored through high-resolution numerical simulations of surface fronts, separating two mixed layers, with a range of configurations similar to those observed in the Arctic Ocean. This study finds that frontal instabilities lead to the development of self-propagating dipoles, which have the potential to propagate far from the front if interactions with other eddies are avoided. However, most dipoles are
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Luchetti, Nicholas T., Katja Friedrich, and Christopher E. Rodell. "Evaluating Thunderstorm Gust Fronts in New Mexico and Arizona." Monthly Weather Review 148, no. 12 (2020): 4943–56. http://dx.doi.org/10.1175/mwr-d-20-0204.1.

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AbstractStrong winds generated by thunderstorm gust fronts can cause sudden changes in fire behavior and threaten the safety of wildland firefighters. Wildfires in complex terrain are particularly vulnerable as gust fronts can be channeled and enhanced by local topography. Despite this, knowledge of gust front characteristics primarily stems from studies of well-organized thunderstorms in flatter areas such as the Great Plains, where the modification of gust fronts by topography is less likely. Here, we broaden the investigation of gust fronts in complex terrain by statistically comparing char
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Kaur, Gurwinderpal, Dilbag Singh, and SK Tomar. "Love waves in a nonlocal elastic media with voids." Journal of Vibration and Control 25, no. 8 (2019): 1470–83. http://dx.doi.org/10.1177/1077546318824144.

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The propagation of Love-type waves in a nonlocal elastic layer with voids resting over a nonlocal elastic solid half-space with voids has been studied. Dispersion relations are derived using appropriate boundary conditions of the model. It is found that there exist two fronts of Love-type surface waves that may travel with distinct speeds. The appearance of the second front is purely due to the presence of voids in layered media. Both fronts are found to be dispersive in nature and affected by the presence of the nonlocality parameter. The first front is found to be nonattenuating, independent
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Wang, Meng, Marion Fourmeau, Lv Zhao, Franck Legrand, and Daniel Nélias. "Self-emitted surface corrugations in dynamic fracture of silicon single crystal." Proceedings of the National Academy of Sciences 117, no. 29 (2020): 16872–79. http://dx.doi.org/10.1073/pnas.1916805117.

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When a dynamic crack front travels through material heterogeneities, elastic waves are emitted, which perturb the crack and change the morphology of the fracture surface. For asperity-free crystalline materials, crack propagation along preferential cleavage planes is expected to present a smooth crack front and form a mirror-like fracture surface. Surprisingly, we show here that in single crystalline silicon without material asperities, the crack front presents a local kink during high-speed crack propagation. Meanwhile, local oscillations of the crack front, which can move along the crack fro
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Cremaschini, Claudio, and Massimo Tessarotto. "The Wave-Front Equation of Gravitational Signals in Classical General Relativity." Symmetry 12, no. 2 (2020): 216. http://dx.doi.org/10.3390/sym12020216.

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In this paper the dynamical equation for propagating wave-fronts of gravitational signals in classical general relativity (GR) is determined. The work relies on the manifestly-covariant Hamilton and Hamilton–Jacobi theories underlying the Einstein field equations recently discovered (Cremaschini and Tessarotto, 2015–2019). The Hamilton–Jacobi equation obtained in this way yields a wave-front description of gravitational field dynamics. It is shown that on a suitable subset of configuration space the latter equation reduces to a Klein–Gordon type equation associated with a 4-scalar field which
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Volpert, Vit, and Vl Volpert. "Propagation of frontal polymerization—crystallization waves." European Journal of Applied Mathematics 5, no. 2 (1994): 201–15. http://dx.doi.org/10.1017/s0956792500001406.

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We consider polymerization–crystallization waves in a cylindrical reactor, in which monomer is converted to polymer in a planar front. The polymer is subsequently crystallized in a wider zone behind the front. Specifically, we study uniformly propagating polymerization–crystallization waves, and determine profiles of temperature, and concentrations of polymer and crystallized polymer, as well as the propagation velocity. A linear stability analysis of the travelling wave solutions indicates the possibility of Hopf bifurcation, which describes the transition to the experimentally observed spinn
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Makarov, P. V., I. Yu Smolin, and V. A. Zimina. "The structure of deformation autosoliton fronts in rocks and geomedia." Geodynamics & Tectonophysics 12, no. 1 (2021): 100–111. http://dx.doi.org/10.5800/gt-2021-12-1-0515.

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The paper describes numerical modeling of the generation and propagation of the fronts of moving deformation autosolitons in a loaded nonlinear strong medium. It presents solving a system of dynamic equations for solid mechanics, using an equation of state written in a relaxation form that takes into account both an overload of the solid medium and subsequent stress relaxation. The structure of a deformation autosoliton front is investigated in detail. It is shown that the front of a deformation autosoliton that is moving in an elastoplastic medium is a shear band (i.e. a narrow zone of intens
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Ayoobi, Mohsen, and Ingmar Schoegl. "Numerical analysis of flame instabilities in narrow channels: Laminar premixed methane/air combustion." International Journal of Spray and Combustion Dynamics 9, no. 3 (2017): 155–71. http://dx.doi.org/10.1177/1756827717706009.

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Premixed flames propagating within small channels show complex combustion phenomena that differ from flame propagation at conventional scales. Available experimental and numerical studies have documented stationary, non-stationary, or asymmetric modes that depend on properties of the incoming reactant flow as well as channel geometry and wall temperatures. This work seeks to illuminate mechanisms leading to symmetry breaking and limit cycle behavior that are fundamental to these combustion modes. Specifically, four cases of lean premixed methane/air combustion—two equivalence ratios (0.53 and
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Giletti, Thomas, and Hiroshi Matano. "Existence and uniqueness of propagating terraces." Communications in Contemporary Mathematics 22, no. 06 (2019): 1950055. http://dx.doi.org/10.1142/s021919971950055x.

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This work focuses on dynamics arising from reaction-diffusion equations, where the profile of propagation is no longer characterized by a single front, but by a layer of several fronts which we call a propagating terrace. This means, intuitively, that transition from one equilibrium to another may occur in several steps, that is, successive phases between some intermediate stationary states. We establish a number of properties on such propagating terraces in a one-dimensional periodic environment under very wide and generic conditions. We are especially concerned with their existence, uniquene
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Dissertations / Theses on the topic "Propagative front"

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Beauvier, Edouard. "Propagation d'un front de réaction-diffusion dans un écoulement cellulaire multi-échelle." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4728/document.

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La propagation d'un front de réaction-diffusion est étudiée expérimentalement dans un écoulement cellulaire multiéchelle. Le front est produit par réaction autocatalytique en solution. L'écoulement est réalisé en géométrie de Hele-Shaw par électroconvection, son caractère multiéchelle étant réalisé par l'action combinée de deux nappes d'aimants d'échelles différentes. La géométrie du front et sa vitesse moyenne de propagation sont déterminées pour une large gamme d'intensité des vortex de chaque échelle. Elles sont confortées par une simulation numérique de l'avancée du domaine brulé dans le d
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Ridgway, Douglas Thacher. "Fluctuation-controlled front propagation /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 1997. http://wwwlib.umi.com/cr/ucsd/fullcit?p9820864.

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Spicer, Amy. "Front propagation for nematic liquid crystals." Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.715260.

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We study the gradient flow model of the Landau-de Gennes energy functional for nematic liquid crystals at the isotropic-nematic transition temperature on prototype geometries. We focus on the three-dimensional droplet, the disc and the square with Dirichlet boundary conditions and different types of initial conditions, with the aim of observing interesting transient dynamics which may be of practical relevance. We use a fourth-order Landau-de Gennes bulk potential which admits isotropic and uniaxial minima at the transition temperature. For a droplet with radial boundary conditions, a large cl
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Leconte, Marc. "Propagation de front de réaction sous écoulement." Paris 7, 2004. http://www.theses.fr/2004PA077113.

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Pauthier, Antoine. "Two examples of reaction-diffusion front propagation in heterogeneous media." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30064/document.

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L'objet de cette thèse est l'étude de deux exemples de propagation pour des équations de réaction-diffusion hétérogènes.Le but de la première partie est de déterminer quels sont les effets d'échanges non locaux entre une ligne de diffusion rapide et un environnement bidimensionnel dans lequel a lieu un phénomène de réaction-diffusion de type KPP usuel. Dans le premier chapitre nous étudions comment ce couplage non local entre la ligne et le plan accélère la propagation dans la direction de la ligne ; on détermine aussi comment différentes fonctions d'échanges maximisent ou non la vitesse d'inv
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Pfeffer, William Ted. "Structure and deformation in a propagating surge front /." Thesis, Connect to this title online; UW restricted, 1988. http://hdl.handle.net/1773/6810.

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Mukherjee, Saikat. "Front Propagation and Feedback in Convective Flow Fields." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/98594.

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This dissertation aims to use theory and numerical simulations to quantify the propagation of fronts, which consist of autocatalytic reaction fronts, fronts with feedback and pattern forming fronts in Rayleigh-Bénard convection. The velocity and geometry of fronts are quantified for fronts traveling through straight parallel convection rolls, spatiotemporally chaotic rolls, and weakly turbulent rolls. The front velocity is found to be dependent on the competing influence of the orientation of the convection rolls and the geometry of the wrinkled front interface which is quantified as a fractal
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Carretero-González, Ricardo. "Front propagation and mode-locking in coupled map lattices." Thesis, Queen Mary, University of London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266212.

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Krishnasamy, Ezhilmathi. "Hybrid CPU-GPU Parallel Simulations of 3D Front Propagation." Thesis, Linköpings universitet, Hållfasthetslära, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-114935.

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This master thesis studies GPU-enabled parallel implementations of the 3D Parallel Marching Method (PMM). 3D PMM is aimed at solving the non-linear static Jacobi-Hamilton equations, which has real world applications such as in the study of geological foldings, where each layer of the Earth’s crust is considered as a front propagating over time. Using the parallel computer architectures, fast simulationscan be achieved, leading to less time consumption, quicker understanding of the inner Earth and enables early exploration of oil and gas reserves. Currently 3D PMM is implemented in shared memor
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Adamson, Fiona. "Propagating reaction fronts in zirconia tubes." Thesis, University of Birmingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.487432.

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Books on the topic "Propagative front"

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Kupervasser, Oleg. Pole Solutions for Flame Front Propagation. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18845-4.

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Osher, Stanley J. Fronts propagating with curvature dependent speed: Algorithms based on Hamilton-Jacobi formulations. ICASE, 1987.

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Horttanainen, Mika. Propagation of the ignition front against airflow in packed beds of wood particles. Lappeenrannan teknillinen korkeakoulu, 2001.

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Osher, Stanley. Fronts propagating with curvature dependent speed: Algorithms based on Hamilton-Jacobi formulations. National Aeronautics and Space Administration, Langley Research Center, 1987.

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Hyperbolic partial differential equations and geometric optics. American Mathematical Society, 2012.

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Kupervasser, Oleg. Pole Solutions for Flame Front Propagation. Springer, 2015.

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Kupervasser, Oleg. Pole Solutions for Flame Front Propagation. Springer, 2016.

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Al-Barwani, Hamdi. Propagation of fronts with gradient and curvature dependent velocities. 1996.

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Daniel. [from old catalog] Campos, Vicenç Méndez, and Frederic Bartumeus. Stochastic Foundations in Movement Ecology: Anomalous Diffusion, Front Propagation and Random Searches. Springer, 2013.

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Daniel. [from old catalog] Campos, Vicenç Méndez, and Frederic Bartumeus. Stochastic Foundations in Movement Ecology: Anomalous Diffusion, Front Propagation and Random Searches. Springer, 2016.

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Book chapters on the topic "Propagative front"

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Soner, H. "Front propagation." In Boundaries, Interfaces, and Transitions. American Mathematical Society, 1998. http://dx.doi.org/10.1090/crmp/013/06.

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Kupervasser, Oleg. "General View of Pole Solutions in Flame Front Propagation." In Pole Solutions for Flame Front Propagation. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18845-4_1.

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Kupervasser, Oleg. "Pole-Dynamics in Unstable Front Propagation: The Case of The Channel Geometry." In Pole Solutions for Flame Front Propagation. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18845-4_2.

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Kupervasser, Oleg. "Using of Pole Dynamics forStability analysis Stability Analysis of Premixed Flame Fronts: Dynamical Systems Approach in the Complex Plane." In Pole Solutions for Flame Front Propagation. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18845-4_3.

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Kupervasser, Oleg. "Dynamics and Wrinkling of Radially Propagating Fronts Inferred from Scaling Laws in Channel Geometries." In Pole Solutions for Flame Front Propagation. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18845-4_4.

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Kupervasser, Oleg. "Laplacian Growth Without Surface Tension in Filtration Combustion: Analytical Pole Solution." In Pole Solutions for Flame Front Propagation. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18845-4_5.

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Kupervasser, Oleg. "Summary." In Pole Solutions for Flame Front Propagation. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18845-4_6.

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Kupervasser, Oleg. "Erratum to: Pole Solutions for Flame Front Propagation." In Pole Solutions for Flame Front Propagation. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-18845-4_7.

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Gårding, Lars. "Wave front sets and oscillatory integrals." In Singularities in Linear Wave Propagation. Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/bfb0073091.

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Collet, P. "Front propagation in one dimension." In Wetting Phenomena. Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/3-540-52338-3_7.

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Conference papers on the topic "Propagative front"

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Aktershev, Sergey, and Valeryi Ovchinnikov. "Steady Propagation of the Vaporization Front in Metastable Liquid." In 17th International Conference on Nuclear Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/icone17-75772.

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The boiling up of a metastable liquid when the vaporization fronts appear is considered by theoretically and experimentally. Boiling up occurs as usually on a surface of a heater. At the first stage the growth of a spherical vapor bubble is observed. If the temperature of liquid exceeds threshold value, the vaporization fronts develop near to line of contact of a vapor bubble and heater. Fronts of vaporization extend along a heater with constant speed. It is direct transition from one-phase convection to a film boiling. Such scenario of crisis of a convective heat transfer also is possible in
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Di Bartolomeo, Mariano, Francesco Massi, Anissa Meziane, Laurent Baillet, and Antonio Culla. "Dynamics of Rupture at Frictional Rough Interfaces During Sliding Initiation." In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-25247.

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The aim of this work is to present the results from a non linear finite element analysis in large transformations of the contact interface between two deformable bodies when sliding initiates and the roughness is introduced at the contact surfaces. The two-dimensional in-plane dynamic model consists of two different isotropic elastic media separated by an interface governed by Coulomb friction law, and subject to remotely applied normal and shear tractions (pre-stress phase). Once the ratio between the local values of tangential and normal stresses reaches the limit value, the sliding initiate
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Kim, Jae Won, JaeMin Hyun, and Eun Young Ahn. "Flows in Rotation Cylinder Filled With Polymer Solutions." In ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/fedsm2006-98334.

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This investigation deals with the spin-up flows in a circular container of aspect ratio, 2.0. Shear front is generated in the transient spin-up process of the present flow system and it is propagating from the side wall to the central axis in a rotating container. Propagation of the shear front to the axis in a rotating container means the region behind the shear front acquires an angular momentum transfer from the solid walls. Propagating speed of the shear front depends on the apparent viscosity of polymer solution. Two kinds of polymer solutions are considered as a working fluid: one is CMC
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Pakala, V. K. Chaitanya, and O. A. Plumb. "Heat Transfer at an Evaporating Front in Porous Media." In ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88240.

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Evaporating fronts propagate through porous media during drying processes, underground coal gasification, geothermal energy production from hot dry rock, and around nuclear waste repositories. Present work will focus on the one-dimensional heat transfer at the interface between vapor saturated porous matrix and water saturated porous region and evaluate the conditions for which various approximations yield an accurate representation of front velocity. An implicit finite difference scheme is utilized to simulate the propagation of an evaporating front in a porous medium saturated with water and
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Ibrahim, Zakaria N. "Piping Fluid Transients Made Simple: Part II — Application of the SSFFC Methods." In ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71788.

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Piping systems transporting fluid between plant components are subjected to a variety of anticipated and/or postulated flow changes that disturb their steady state operations. These changes cause the fluid flow to accelerate and/or decelerate. However, consideration of fluid elasticity transforms these disturbances into weak and/or strong propagating sound waves, depending upon the abruptness level of the fluid state change. This generates dynamic forces on the pipe segments of the piping system. A simple concept for understanding the piping fluid transient phenomenon from its physical perspec
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Park, K. C., and S. S. Cho. "A Method for Computation of Wave Propagation in Heterogeneous Solids: Algorithm Description." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63639.

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An explicit integration algorithm for computations of wave propagation in solids is presented, which is designed to trace extensional and shear waves in accordance with their respective propagation speeds. This has been possible by an orthogonal decomposition of the total displacement into extensional and shear components. The two decoupled wave equations are integrated with a newly developed algorithm[1, 2] that is proven to be effective in mitigating spurious oscillations. The essence of the present algorithm consists of a combination of two wave capturing characteristics: a new integration
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"Front cover." In Propagation Conference (LAPC). IEEE, 2010. http://dx.doi.org/10.1109/lapc.2010.5666894.

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"Front page." In Propagation Conference (LAPC). IEEE, 2011. http://dx.doi.org/10.1109/lapc.2011.6113970.

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Stosic, Zoran V., Vladimir D. Stevanovic, and Tadashi Iguchi. "Three-Dimensional Characteristics of Post-CHF Behaviour Within a Rod Bundle for Loss-of-Flow Simulation: Experimental and Three-Fluid Porous Media Numerical Analyses." In 10th International Conference on Nuclear Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/icone10-22203.

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The investigation of three-dimensional transient propagations of dry-out fronts within a nuclear fuel rod bundle is performed, based on experimental and numerical simulations. The spreading of Critical Heat Flux (CHF) fronts across a bundle, caused by sudden decrease of coolant mass flow rate followed by delayed gradual decrease of power generation is predicted, and the locus of dry patches is shown. Simultaneous occurrence of CHF and rewet multi-fronts in here-analysed flow transient has not been detected so obvious as in power transient, previously analysed. Due to a possible building of a v
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Stosic, Zoran V., Vladimir D. Stevanovic, and Tadashi Iguchi. "Analyses of Spatial CHF/Rewet Behaviour of Fuel Rod Bundle in Pump-Trip Simulation Experiment With Three-Dimensional Multi-Fluid Porous Media Approach." In ASME 2002 Joint U.S.-European Fluids Engineering Division Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/fedsm2002-31228.

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The investigation of three-dimensional transient propagations of dry-out fronts within a nuclear fuel rod bundle is performed, based on experimental and numerical simulations. The spreading of critical heat flux (CHF) fronts across a bundle, caused by gradual decrease of coolant mass flow rate without power increase is predicted, and the locus of dry patches is shown. Obtained results show that a simultaneous occurrence of CHF and rewet multi-fronts in simulated reactor coolant flow transient are less pronounced than in power transients. Due to a possible building of a vapour zone, the CHF fro
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Reports on the topic "Propagative front"

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Dobbs, R. L. II, and W. B. Krantz. Combustion front propagation in underground coal gasification. Office of Scientific and Technical Information (OSTI), 1990. http://dx.doi.org/10.2172/6035494.

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Rehm, Ronald G. Fire-front propagation using the level set method. National Bureau of Standards, 2009. http://dx.doi.org/10.6028/nist.tn.1611.

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Akkutlu, I. Yucel, and Yanis C. Yortsos. Non-Adiabatic Effects on Combustion Front Propagation in Porous Media: Multiplicity of Steady States. Office of Scientific and Technical Information (OSTI), 2002. http://dx.doi.org/10.2172/792462.

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Miller, James H., and Gopu R. Potty. Variability in 3D Acoustic Propagation in Shallow Water Near Ocean Fronts. Defense Technical Information Center, 2009. http://dx.doi.org/10.21236/ada531584.

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Akkutlu, I. Yucel, and Yanis C. Yortsos. The Effect of Heterogeneity on In-Situ Combustion: The Propagation of Combustion Fronts in Layered Porous Media. Office of Scientific and Technical Information (OSTI), 2002. http://dx.doi.org/10.2172/795238.

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Miller, James H., and Gopu R. Potty. Modeling and Measuring Variability in 3-D Acoustic Normal Mode Propagation in Shallow Water Near Ocean Fronts Using Fixed and Moving Sources and Receivers. Defense Technical Information Center, 2007. http://dx.doi.org/10.21236/ada573346.

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