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如何保證求解精度 #4

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CebFu opened this issue Sep 26, 2023 · 2 comments
Open

如何保證求解精度 #4

CebFu opened this issue Sep 26, 2023 · 2 comments

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@CebFu
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CebFu commented Sep 26, 2023 •
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Hi, @lavenklau - 我閱讀了你們的文章，有一個疑惑想要請教您。你們採用了代數多网格算法來計算均質化的等效剛度，但是據我所知amg方法一般用作預處理器，還需要經過cg求解器迭代修正來保證精度，你們的文章沒有提及，不只是如何處理的。萬分感謝！
@CebFu CebFu closed this as completed Sep 26, 2023
@CebFu CebFu reopened this Sep 26, 2023
@CebFu CebFu closed this as completed Sep 26, 2023
@CebFu CebFu reopened this Sep 27, 2023
@CebFu CebFu changed the title 怎么给稀疏结构的初值 如何保證求解精度 Sep 27, 2023
@lavenklau
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从实验来看的话，只用MG也可以收敛，优化到后面的时候基本只要几步MG迭代就可以达到精度要求，所以没去做cg的预处理器，我觉得换成mgpcg最后的迭代步数区别不大

@CebFu
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CebFu commented Sep 27, 2023

非常感謝您的解答 @lavenklau 給了我很好的思路，我將做一些精度測試，如amg能滿足需求，在效率上確實能大大提升，這對我非常有幫助

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@lavenklau @CebFu