24小时热门版块排行榜    

查看: 2039  |  回复: 1

qiudong1009

金虫 (小有名气)

[求助] 关于“FFT grid”问题

请问下:
FFT grid 的设置精度对计算结果和计算速度的影响怎样?
以下是manual的解释:
“Derived grid: Specify the quality of the FFT grid. Three options are available:
Standard
Fine
Precise
The FFT grid parameters are chosen such that they provide a good representation of the electron density. At the Precise level, an exact representation of the density is provided for the given energy-cutoff. At the Standard and Fine levels, a reduced FFT grid is used to speed up the calculation. Some aliasing will occur as a result but the effect on the SCF solution is usually small.

最后一句话说对自洽运算的影响通常是很小的,那么综合计算效率和精确性考虑大家一般设置的是哪一项呢?
5.0默认的是precise,而4.0默认的是standard~~
回复此楼
克己
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

gougou531

禁虫 (正式写手)

本帖内容被屏蔽

2楼2011-04-18 14:24:53
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
相关版块跳转 我要订阅楼主 qiudong1009 的主题更新
信息提示
请填处理意见