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Super-time-stepping schemes for parabolic equations with boundary conditions

机译:具有边界条件的抛物线方程的超时步进方案

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We present a super-time-stepping scheme for numerically solving parabolic partial differential equations with Dirichlet boundary conditions (BC). Using the general Forward Euler scheme, one can show that by taking varying step sizes there is the potential of propagating the solution forward in time by a greater amount than with uniform step sizes, while maintaining the same order of accuracy. As shown in [1] and [2], if one further requires that the scheme has the Convex Monotone Property (CMP), then there exists a scheme which results in linear, monotone stability of the solution. This monotone stability is highly desirable in many physical situations, such as thermal diffusion, where the physical system will not oscillate, but will behave monotonically. However, the schemes devised in [3], [4], [1], and [2] do not include situations that have a boundary condition [5,6], and the inclusion of boundary conditions will henceforth be our focus. It is shown that a particular Runge-Kutta-Gegenbauer class of schemes [7] will maintain the CMP even in the presence of Dirichlet BC. (C) 2020 Elsevier Inc. All rights reserved.
机译:本文提出了一种数值求解具有Dirichlet边界条件的抛物型偏微分方程的超时间步格式。使用一般的前向Euler格式,我们可以证明,通过采用不同的步长,在保持相同精度的同时,将解在时间上向前传播的可能性比采用统一步长时大。如[1]和[2]所示,如果进一步要求该格式具有凸单调性(CMP),则存在一个导致解的线性单调稳定性的格式。这种单调稳定性在许多物理情况下都是非常理想的,比如热扩散,在这种情况下,物理系统不会振荡,但会表现出单调的行为。然而,在[3]、[4]、[1]和[2]中设计的方案不包括具有边界条件的情况[5,6],因此边界条件的包含将是我们今后的重点。证明了一类特殊的Runge-Kutta-Gegenbauer方案[7]即使在Dirichlet BC存在的情况下也能保持CMP。(C) 2020爱思唯尔公司版权所有。

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