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arXiv 1307.8167physics.flu-dyncs.NAmath.NA
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二维流体流动的计算方法

A computational methodology for two-dimensional fluid flows

Jahrul Alam, Raymond Walsh, Alamgir Hossain, Andrew Rose

摘要:

本文提出了一种模拟二维剪切驱动和自然对流的加权残值配置法。使用二进网格细化,该方法产生的基础和多分辨率方案近似流体流动。为了将并矢网格加密方法的优点扩展到计算流体动力学领域,本文研究了一种迭代插值方案,用于构造和微分二维网格中的基函数,该网格是矩形单元的有限集合。我们已经证实,在一个给定的网格,离散误差控制的基函数的阶数。这种新技术的潜力已被证明与泊松方程的一些代表性的例子。我们还验证了技术与原始变量的二维流的动力学核心。一个很好的结果已被证实,解决剪切层和守恒的潜力和动能与以前报道的基准模拟。特别是,在CFL = 2.5(Courant-Friedrichs-Lewy)和$\mathcal Re = 1\,000$(雷诺数)下的剪切驱动模拟显示出CPU时间随着时间步长$Delta t$的增加而线性加速。对于自然对流,该方法解决了势能到动能的转换和总能量守恒问题。计算的流线和速度场已被证明。

英文摘要:

A weighted residual collocation methodology for simulating two-dimensional shear-driven and natural convection flows has been presented. Using a dyadic mesh refinement, the methodology generates a basis and a multiresolution scheme to approximate a fluid flow. To extend the benefits of the dyadic mesh refinement approach to the field of computational fluid dynamics, this article has studied an iterative interpolation scheme for the construction and differentiation of a basis function in a two-dimensional mesh that is a finite collection of rectangular elements. We have verified that, on a given mesh, the discretization error is controlled by the order of the basis function. The potential of this novel technique has been demonstrated with some representative examples of the Poisson equation. We have also verified the technique with a dynamical core of two-dimensional flow in primitive variables. An excellent result has been observed-on resolving a shear layer and on the conservation of the potential and the kinetic energies with respect to previously reported benchmark simulations. In particular, the shear-driven simulation at CFL = 2.5 (Courant-Friedrichs-Lewy) and $\mathcal Re = 1\,000$ (Reynolds number) exhibits a linear speedup of CPU time with an increase of the time step, $Delta t$. For the natural convection flow, the conversion of the potential energy to the kinetic energy and the conservation of total energy is resolved by the proposed method. The computed streamlines and the velocity fields have been demonstrated.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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