首页> 外文期刊>Numerical Heat Transfer, Part B. Fundamentals: An International Journal of Computation and Methodology >FINITE-ELEMENT ANALYSIS OF PHASE-CHANGE PROBLEMS USING MULTILEVEL TECHNIQUES
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FINITE-ELEMENT ANALYSIS OF PHASE-CHANGE PROBLEMS USING MULTILEVEL TECHNIQUES

机译:运用多层次技术对相变问题进行有限元分析

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A simple and effective finite-element procedure is presented for the analysis of transient heat transfer with phase changes. An averaged specific heat is employed to simulate the elements including the phase-change zone in this finite-element analysis with fired mesh. Due to the use of a Gauss-Seidel method and a multigrid algorithm, the computational complexity can be reduced from O(n(3)) to O(n In n) with high storage efficiency. The computational results are also in very good agreement with the exact solutions. Results show that the magnitudes of the time step and freezing-temperature interval have little effects on the maximal and average errors. As a result, a larger time step carl be used to save computing time and achieve the same order of accuracy. This algorithm is available for pure metals and alloys that exhibit discontinuous specific heat. [References: 21]
机译:提出了一种简单有效的有限元程序,用于分析具有相变的瞬态传热。在使用烧结网格的有限元分析中,使用平均比热来模拟包括相变区在内的元素。由于使用了高斯-赛德尔(Gauss-Seidel)方法和多网格算法,因此可以以高存储效率将计算复杂度从O(n(3))降低到O(n In n)。计算结果也与精确解非常吻合。结果表明,时间步长和冻结温度间隔的大小对最大和平均误差影响很小。结果,将使用较大的时间步长来节省计算时间并达到相同的精度等级。该算法适用于显示不连续比热的纯金属和合金。 [参考:21]

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