本文選題：兵器科學與技術 + 數值計算�。� 參考：《兵工學報》2016年10期

【摘要】：巖石動力學計算中,網格尺寸對數值計算結果的可靠性有重要影響。采用數值實驗的方法,對巖石爆炸應力波傳播數值計算中的網格尺寸效應及其敏感性機理進行了研究。研究結果表明:合適的網格尺寸要根據載荷特征和波傳播介質的屬性來決定;當一個載荷波長內的網格數達到16個以上時,計算得到的各物理量的波形和峰值基本趨于穩(wěn)定;計算還給出了各物理量與網格密度的關系;隨著爆心距的增加,物理量對網格尺寸的敏感性降低,其機理是載荷中的高頻成分逐漸衰減、載荷的波長變大,模型所需的網格尺寸變大;時間步長系數對計算結果的影響也非常明顯,當時間步長系數取0.05時,位移穩(wěn)態(tài)值趨于收斂值。
[Abstract]:The mesh size has an important effect on the reliability of the numerical results in rock dynamics calculation.The mesh size effect and its sensitivity mechanism in numerical calculation of rock explosion stress wave propagation are studied by numerical experiments.The relationship between the physical quantities and the mesh density is also given, and the sensitivity of the physical quantities to the mesh size decreases with the increase of the distance between the detonation centers, the mechanism of which is that the high frequency components of the load gradually decrease and the wavelength of the load becomes larger.The mesh size needed by the model becomes larger and the influence of the time step coefficient on the calculation results is very obvious. When the time step coefficient is 0.05, the steady-state displacement value tends to converge.
【作者單位】： 北京理工大學爆炸科學與技術國家重點實驗室;西北核技術研究所;
【基金】：國家自然科學基金項目(91330205)
【分類號】：O383.1

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1 覃文潔;胡春光;郭良平;左正興;;近壁面網格尺寸對湍流計算的影響[J];北京理工大學學報;2006年05期

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