首页> 外文期刊>Numerical Heat Transfer, Part B. Fundamentals: An International Journal of Computation and Methodology >GLOBAL VERSUS LOCALIZED RBF MESHLESS METHODS FOR SOLVING INCOMPRESSIBLE FLUID FLOW WITH HEAT TRANSFER
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GLOBAL VERSUS LOCALIZED RBF MESHLESS METHODS FOR SOLVING INCOMPRESSIBLE FLUID FLOW WITH HEAT TRANSFER

机译:用传热解决不可压流体流动的全局与局部RBF无网格方法

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摘要

Global and localized radial basis function (RBF) meshless methods are compared for solving viscous incompressible fluid flow with heat transfer using structured multiquadratic RBFs. In the global approach, the collocation is made globally over the whole domain, so the size of the discretization matrices scales as the number of the nodes in the domain. The localized meshless method uses a local collocation defined over a set of overlapping domains of influence. Only small systems of linear equations need to be solved for each node. The computational effort thus grows linearly with the number of nodesthe localized approach is slightly more expensive on serial processors, but is highly parallelizable. Numerical results are presented for three benchmark problemsthe lid-driven cavity, natural convection within an enclosure, and forced convective flow over a backward-facing stepand results are compared with the finite-element method (FEM) and experimental data.
机译:比较了全局和局部径向基函数(RBF)的无网格方法,该方法使用结构化多二次RBF求解带有热传递的粘性不可压缩流体。在全局方法中,配置是在整个域中全局进行的,因此离散化矩阵的大小与域中节点的数量成比例。局部无网格方法使用在一组重叠影响域上定义的局部搭配。对于每个节点,只需要求解线性方程的小型系统。因此,计算量随节点数量线性增长,在串行处理器上,局部化方法的成本稍高一些,但高度可并行化。给出了三个基准问题的数值结果,即盖驱动腔,罩体内的自然对流和向后台阶上的强制对流,并将结果与​​有限元方法(FEM)和实验数据进行了比较。

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