FEM相关 - 悲催的科学匠人 - 冷水's blog
FEM相关
冷水
posted @ 2012年3月22日 22:38
in CFD
, 1120 阅读
SUPG中的稳定项是二阶偏导，人工耗散系数与ah成正比，a是特征速度，h是网格尺度。
JST中心差分的稳定项是四阶偏导。
因此我以为JST中心差分的稳定项的阶段误差更低。
但是仔细想想，JST人工耗散系数是谱半径成正比，考虑到除单元体积，则相当于aA/Vol，其中A/Vol就是网格尺度h。因此，SUPG的人工耗散系数和Jameson中心差分的是一样。只是梯度阶数不一样，一个是二阶，一个是四阶。但是两者带来截断误差都是O(h)。
扫了一眼开发者的博士论文论文，LM的网格存储没有按照分区进行完全分布式存储，而是每个进程都保留全部网格，这样就限制了并行的规模。作者当时进行的最大规模并行计算是400个进程。相比而言，DII的并行能力要成熟许多，测试过数千进程。如果想做FEM开发，似乎DII还是更好的选择。
2022年8月21日 07:25
This board is linked with a large number of public, private, and colleges, and all of them operate under its supervision. For the students in this state, this board offers a variety of courses and administers exams, in which a large number of students participate. Numerous kids are now enrolled in class 11, and the Odisha Board 11th class Important Question Paper 2023 will be available soon. In the month of May, Odisha Plus One Previous Paper 2023 the CHSE 11th Question Paper 2023 was released. Therefore, all of the students who took the class 11th examinations this year are eagerly awaiting the release of the CHSE 11th Important Question Paper 2023.