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qiudong1009金蟲 (小有名氣)
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[求助]
關(guān)于“FFT grid”問(wèn)題
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請(qǐng)問(wèn)下: FFT grid 的設(shè)置精度對(duì)計(jì)算結(jié)果和計(jì)算速度的影響怎樣? 以下是manual的解釋: “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. ” 最后一句話說(shuō)對(duì)自洽運(yùn)算的影響通常是很小的,那么綜合計(jì)算效率和精確性考慮大家一般設(shè)置的是哪一項(xiàng)呢? 5.0默認(rèn)的是precise,而4.0默認(rèn)的是standard~~ |

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