Three-dimensionalsimulationsonexplosiveloadcharacteristicsof underwaterexplosionnearfreesurface
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摘要: 基于三维SPH 方法,对传统链表搜索算法进行了变光滑长度改进,并提出了具有较好稳定性的多 相物质交界面的处理方法,模拟了三维无限域水下爆炸问题,验证了改进的三维SPH 方法模拟水下爆炸问题 的可行性和有效性。在此基础上,建立了水下爆炸三维数值模型,模拟了近自由面水下爆炸过程,研究了冲击 波传播特征、自由面下压力场和能量场特性以及水柱的产生过程。结果表明:自由面可将冲击波压力峰值和 压力冲量最大衰减到1/3和1/7;爆深的增加会导致压力比和冲量比的等值柱面曲率变小,产生的水柱也逐 渐由破碎的喷柱向高而窄的水冢过渡。Abstract: Basedonthethree-dimensionalSPH method,thevariablesmoothinglengthmodificationis appliedtothetraditionallinked-listsearchalgorithm,andthestableapproachofdealingwithmultiphasematerialinterfaceisputforward. Throughsimulatingunderwaterexplosionoffreefield,the feasibilityandeffectivenessofthe modified methodareverified.Thethree-dimensionalnumerical modelisestablished,andtheprocessofunderwaterexplosionnearfreesurfaceisreproduced.Characteristicsofshockwavepropagation, pressurefieldandenergyfieldaresummedup.Theeffectofdifferentexplosiondepthontheinitialwatercolumnformationisstudied. Resultsshowthatfreesurface canattenuatethepeakpressureandimpulsetoonethirdandoneseventhoftheoriginalvalues,respectively. Withtheincreaseofdetonationdepth,curvatureoftheequivalentcylinderofpeakpressureratioandimpulseratiodecrease, andtheproducedwatercolumngraduallytransitsfrombroken andspraycolumntohighandnarrow mound.
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