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散射问题中消除多次透射边界飘移失稳措施比较分析

DOI: 10.13197/j.eeev.2014.05.1.yangy.001, PP. 1-6

Keywords: 波动模拟,多次透射边界,低频飘移失稳,降阶消飘,修正算子

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Abstract:

多次透射边界是一种广泛应用的人工边界,但类似于其它局部人工边界,它也存在计算稳定性问题。本文分析了多次透射边界低频飘移失稳的原因,通过数值试验对已有的消除飘移失稳措施进行了比较分析,并给出了在散射问题中已有消飘措施的适用性γ修正算子法的参数确定没有一个明确的标准,完全依靠经验性试算,使用上应注意参数的取值控制;降阶消飘方法的关键在于失稳趋势的判定,不存在方法参数的选取,实现上可控性较好。

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