نتایج جستجو برای: dimensional media

تعداد نتایج: 672273  

Journal: :Journal of Fluid Mechanics 2022

We perform large-scale numerical simulations to study Rayleigh–Darcy convection in three-dimensional fluid-saturated porous media up number $Ra=8\times 10^4$ . At these large values of $Ra$ , the flow is dominated by columnar structures – called megaplumes which span entire height domain. Near boundaries, hierarchically organized, with fine-scale interacting and nesting form larger-scale superc...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2006
D Mihalache D Mazilu F Lederer B A Malomed Y V Kartashov L-C Crasovan L Torner

We demonstrate the existence of stable three-dimensional spatiotemporal solitons (STSs) in media with a nonlocal cubic nonlinearity. Fundamental (nonspinning) STSs forming one-parameter families are stable if their propagation constant exceeds a certain critical value that is inversely proportional to the range of nonlocality of nonlinear response. All spinning three-dimensional STSs are found ...

Journal: :Physical review letters 2007
Nikolaos K Efremidis Kyriakos Hizanidis Boris A Malomed Paolo Di Trapani

We demonstrate that families of vortex solitons are possible in a bidispersive three-dimensional nonlinear Schrödinger equation. These solutions can be considered as extensions of two-dimensional dark vortex solitons which, along the third dimension, remain localized due to the interplay between dispersion and nonlinearity. Such vortex solitons can be observed in optical media with normal dispe...

2005
Ronghua Pan Ling Hsiao

It is conjectured that Darcy’s law governs the motion of compressible porous media flow in large time. This has been justified for one-dimensional isentropic flows. In this work, we show the conjecture is true for one-dimensional adiabatic flows with generic small smooth initial data. © 2004 Elsevier Inc. All rights reserved.

Journal: :IEEE Transactions on Antennas and Propagation 1989

Journal: :International Journal for Numerical Methods in Engineering 1997

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