Results 201 to 210 of about 1,840,169 (238)
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THE ‘NO BOUNDARY CONDITION’ OUTFLOW BOUNDARY CONDITION
International Journal for Numerical Methods in Fluids, 1997Summary: We use a one-dimensional model problem of advection-diffusion to investigate the treatment recently advocated by \textit{T. C. Papanastasiou, N. Malamataris} and \textit{K. Ellwood} [Int. J. Numer. Methods Fluids 14, No. 5, 587--608 (1992; Zbl 0747.76039)] to deal with boundary conditions at artificial outflow boundaries. Using finite elements
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Pressure boundary conditions for immersed-boundary methods
Journal of Computational Physics, 2023Immersed boundary methods have seen an enormous increase in popularity over the past two decades, especially for problems involving complex moving/deforming boundaries. In most cases, the boundary conditions on the immersed body are enforced via forcing functions in the momentum equations, which in the case of fractional step methods may be problematic
Yildiran, Ibrahim Nasuh +5 more
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On Nonreflecting Boundary Conditions
Journal of Computational Physics, 1995This paper contributes to the study of nonreflecting boundary conditions at artificial boundaries for use with the Helmholtz equation. The following developments are covered: -- How to remove the difficulties that arise when the exact Dirichlet-to-Neumann condition is truncated?
Marcus J. Grote, Joseph B. Keller
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Boundary conditions in electromagnetics
Physical Review E, 1993A proof is given to show that satisfying the boundary conditions on the tangential electric and magnetic fields across the boundary surface of two different material media means that the boundary conditions on the normal magnetic-induction vector and electric-displacement vector are automatically satisfied while the converse is not true.
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Generalized Boundary Conditions
The Physics of Fluids, 1970The concept of the generalized boundary condition is introduced, and stabilization of ion-sound waves and drift waves using such boundary conditions is demonstrated. The boundary consists of a two-dimensional, lumped-parameter transmission line in electrical contact with the plasma.
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The Psychoanalytic Quarterly, 1999
Boundaries in psychoanalysis and psychotherapy can be considered either as indicators of moral transgressions or as guidelines for therapeutic intervention. This paper suggests that these categories be better delineated in the hope that less attention be paid to that of moral mistakes and more to that of treatment effectiveness.
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Boundaries in psychoanalysis and psychotherapy can be considered either as indicators of moral transgressions or as guidelines for therapeutic intervention. This paper suggests that these categories be better delineated in the hope that less attention be paid to that of moral mistakes and more to that of treatment effectiveness.
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The impedance-boundary condition
IEEE Antennas and Propagation Magazine, 1996Part of the material presented in this article has been collected in the framework of a research activity on the history of ray optics. The aim of this project is collect some reprints of the most-significant original papers of the history of ray optics, from the seventeenth century (i.e., from the work by Rene Descartes) up to now.
PELOSI, GIUSEPPE, P. Y.a. Ufimtsev
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On General Boundary Conditions
2018 2nd URSI Atlantic Radio Science Meeting (AT-RASC), 2018Boundary conditions are essential, along with the Maxwell equations, in defining electromagnetic problems. On a boundary surface, two scalar conditions relating the field vectors are required to be satisfied.
Sihvola Ari, Lindell Ismo
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An Introduction to Boundary Conditions
1996The aim of this chapter is to introduce the unfamiliar reader to the topic of boundary conditions: we just want to give some insight into this question and do not pretend to give an exhaustive study. We recall first the main features of the initial boundary value problem (I.B.V.P.) before we present the numerical treatment of the question.
Pierre-Arnaud Raviart, Edwige Godlewski
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On the no-slip boundary condition
Journal of Fluid Mechanics, 1973It has been argued that the no-slip boundary condition, applicable when a viscous fluid flows over a solid surface, may be an inevitable consequence of the fact that all such surfaces are, in practice, rough on a microscopic scale: the energy lost through viscous dissipation as a fluid passes over and around these irregularities is sufficient to ensure
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