首页> 外文期刊>Numerical Heat Transfer, Part B. Fundamentals: An International Journal of Computation and Methodology >TRANSIENT SOLUTIONS BY A LEAST-SQUARES FINITE-ELEMENT METHOD AND JACOBI CONJUGATE GRADIENT TECHNIQUE
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TRANSIENT SOLUTIONS BY A LEAST-SQUARES FINITE-ELEMENT METHOD AND JACOBI CONJUGATE GRADIENT TECHNIQUE

机译:最小二乘有限元法和Jacobi共轭梯度法的瞬态解

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摘要

We present a least-squares finite-element method that can provide implicit, fully coupled transient solutions for time-dependent incompressible fluid flows and thermal convection. The algorithm consists of the Crank-Nicolson scheme for time discretization, Newton's method for linearization, and a matrix-free Jacobi conjugate gradient method as an iterative solver for the symmetric, positive-definite linear system of equations. The combined algorithm is first validated by two-dimensional flows: flows in a square cavity with a periodically oscillating lid and mixed convection in a driven cavity. Then the algorithm is used to obtain transient solutions of a three-dimensional lid-driven cavity flow for Re = 400. [References: 22]
机译:我们提出了一种最小二乘有限元方法,该方法可以为依赖于时间的不可压缩流体流动和热对流提供隐式,完全耦合的瞬态解。该算法包括用于时间离散化的Crank-Nicolson方案,用于线性化的牛顿法,以及作为对称正定线性方程组的迭代求解器的无矩阵Jacobi共轭梯度法。组合算法首先通过二维流验证:带有周期性振动盖的方腔中的流和从动腔中的对流混合。然后,该算法用于获得Re = 400的三维盖驱动腔流的瞬态解。[参考文献:22]

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