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A time discretization scheme based on integrated radial basis functions for heat transfer and fluid flow problems

机译:一种基于集成径向基函数的传热和流体流动问题的时间离散化方案

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This article reports a new numerical procedure, which is based on integrated radial basis functions (IRBFs) and Cartesian grids, for solving time-dependent differential problems that can be defined on non-rectangular domains. For space discretizations, compact five-point IRBF stencils are utilized. For time discretizations, a two-point IRBF scheme is proposed, where the time derivative is approximated in terms of not only nodal function values at the current and previous time levels but also nodal derivative values at the previous time level. This allows functions other than a linear one to also be captured well on a time step. The use of the RBF width as an additional parameter to enhance the approximation quality with respect to time is also explored. Various kinds of test problems of heat transfer and fluid flows are conducted to demonstrate the the attractiveness of the present compact approximations.
机译:本文报告了一种新的数值程序,它基于集成的径向基函数(IRBF)和笛卡尔网格,用于解决可以在非矩形域上定义的时间相关的差异问题。 对于空间离散化,使用紧凑的五点IRBF模板。 对于时间离散化,提出了一种两点IRBF方案,其中时间衍生物在当前和先前的时间级别下的不仅是节点函数值,而且在前一次时间级别的节点衍生值也是近似的。 这允许在时间步骤中捕获除线性的功能之外的功能。 还探讨了使用RBF宽度作为增强相对于时间的近似质量的附加参数。 进行传热和流体流动的各种测试问题以证明本紧凑率近似的吸引力。

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