气泡及其破碎兴波对浮动冲击平台影响探究
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摘要
基于LS-DYNA软件中的ALE算法,对近水面水下爆炸气泡脉动过程进行数值模拟并与实验结果进行对比,验证了近水面近壁面混合边界有限元模型和参数设置的正确性。设置不同爆炸工况,对气泡及其破碎兴波对浮动冲击平台影响进行探究,结果表明:在水下爆炸过程中,气泡、自由面、浮动冲击平台会发生强烈的耦合作用,在气泡脉动阶段,气泡会诱导出涌流和水冢效应,影响浮动冲击平台的安全性和使用性;冲击波是影响浮动冲击平台冲击环境的主要因素,由于气泡的低频性,气泡脉动及水冢对浮动冲击平台的直接冲击作用,会小幅度增加浮动冲击平台冲击环境的谱速度值、谱位移值,对谱加速度值几乎无影响;水冢抨击水面所形成的波浪和气泡破碎兴波,对浮动冲击平台造成的激励载荷呈周期性,其周期与波浪周期相同。波浪的激励载荷仅通过激励其对应频率的浮动冲击平台共振来改变平台的冲击环境。波浪载荷很小,对浮动冲击平台的冲击环境影响较小。
Based on the ALE algorithm in LS-DYNA software, the numerical simulation of the pulsation process of underwater explosion near water surface is carried out and compared with the experimental results. The correctness of the finite element model and parameter setting of the near-wall hybrid boundary near the water surface is verified. The different explosion conditions are set up, and the influence of air bubbles and their broken waves on the floating shock platform is explored. The results show that during the underwater explosion, the bubble, free surface and floating shock platform will have strong coupling effect,in the bubble pulsation stage. The bubble will induce the inrush current and the water ripple effect, affecting the safety and usability of the floating shock platform; the shock wave is the main factor affecting the shock environment of the floating shock platform. Due to the low frequency of the bubble, the bubble pulsation and the water ripple on the floating shock platform The direct shock effect will increase the spectral velocity value and spectral displacement value of the shock environment of the floating shock platform to a small extent, and has almost no effect on the spectral acceleration value; the waves and bubbles formed by the water slamming water surface are broken and waved, which is caused by the floating shock platform. The excitation load is periodic with the same period as the wave period. The excitation load of the wave changes the shock environment of the platform only by exciting the floating shock platform resonance of its corresponding frequency. The wave load is small and has little shock on the shock environment of the floating shock platform.
Based on the ALE algorithm in LS-DYNA software, the numerical simulation of the pulsation process of underwater explosion near water surface is carried out and compared with the experimental results. The correctness of the finite element model and parameter setting of the near-wall hybrid boundary near the water surface is verified. The different explosion conditions are set up, and the influence of air bubbles and their broken waves on the floating shock platform is explored. The results show that during the underwater explosion, the bubble, free surface and floating shock platform will have strong coupling effect,in the bubble pulsation stage. The bubble will induce the inrush current and the water ripple effect, affecting the safety and usability of the floating shock platform; the shock wave is the main factor affecting the shock environment of the floating shock platform. Due to the low frequency of the bubble, the bubble pulsation and the water ripple on the floating shock platform The direct shock effect will increase the spectral velocity value and spectral displacement value of the shock environment of the floating shock platform to a small extent, and has almost no effect on the spectral acceleration value; the waves and bubbles formed by the water slamming water surface are broken and waved, which is caused by the floating shock platform. The excitation load is periodic with the same period as the wave period. The excitation load of the wave changes the shock environment of the platform only by exciting the floating shock platform resonance of its corresponding frequency. The wave load is small and has little shock on the shock environment of the floating shock platform.
引文
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[12]郑长允,赵鹏远,赵红光,等.设备缓冲平台在水下爆炸载荷作用下冲击响应分析[J].科技导报,2012,30(18):37-40.DOI:10.3981/j.issn.1000-7857.2012.18.004.ZHENG Changyun,ZHAO Pengyuan,ZHAO Hongguang,et al.Shock response analysis of equipment buffer platform under underwater explosion loading[J].Science&Technology Review,2012,30(18):37-40.DOI:10.3981/j.issn.1000-7857.2012.18.004.
[13]CUI P,ZHANG A M,WANG S P.Small-charge underwater explosion bubble experiments under various boundary conditions[J].Physics of Fluids,2016,28(11):283.
[14]王军,姚熊亮,杨棣.浮动冲击平台冲击环境对设备响应的影响[J].爆炸与冲击,2015,35(2):236-242.DOI:10.11883/1001-1455(2015)02-0236-07.WANG Jun,YAO Xiongliang,YANG Di.Shock of shock platform on the response of equipment to[J].Explosion and Shock Waves,2015,35(2):236-242.DOI:10.11883/1001-1455(2015)02-0236-07.
[2]宫国田,金辉,张姝红,等.国外舰艇抗水下爆炸研究综述[C]//第九届全国冲击动力学学术会议.河南焦作,2009.
[3]王军.浮动冲击平台冲击动力特性研究[D].哈尔滨:哈尔滨工程大学,2015.
[4]KEIL A H.The response of ships to underwater explosions[J].Transactions-Society of Naval Architects and Marine Engineers,2010,69:43.
[5]KLASEBOER E,KHOO B C,HUNG K C.Dynamics of an oscillating bubble near a floating structure[J].Journal of Fluids and Structures,2005,21(4):395-412.DOI:10.1016/j.jfluidstructs.2005.08.006.
[6]ZHANG A M,ZENG L Y,CHENG X D,et al.The evaluation method of total damage to ship in underwater explosion[J].Applied Ocean Research,2011,33(4):240-251.DOI:10.1016/j.apor.2011.06.002.
[7]ZHANG N,ZONG Z.The effect of rigid-body motions on the whipping response of a ship hull subjected to an underwater bubble[J].Journal of Fluids&Structures,2011,27(8):1326-1336.
[8]沈国光,李德筠,李润珊,等.大当量爆炸兴波的数值模拟[J].海洋学报,1996,18(5):128-133.SHEN Guoguang,LI Deyun,LI Runshan.Numerical simulation of large equivalent detonation wave[J].Acta Oceanica Sinica,1996,18(5):128-133.
[9]李汪讳,宗智,孙雷.水下爆炸兴波及其对结构物作用问题的数值模拟[J].水动力学研究与进展:A辑,2010,25(6):792-805.LI Wanghui,ZONG Zhi,SUN Lei.Numerical simulation of underwater explosion and wave propagation and its effect on structures[J].Journal of Hydrodynamics:A,2010,25(6):792-805.
[10]WANG Q.The bursting of an underwater explosion bubble at a free surface[J].Ocean Engineering,2015,109:611-622.DOI:10.1016/j.oceaneng.2015.09.017.
[11]王军,郭君,姚熊亮.冲击波作用下浮动冲击平台的刚体响应分析[J].华中科技大学学报(自然科学版),2015(2):71-75.WANG Jun,GUO Jun,YAO Xiongliang.Rigid body response analysis of a floating shock platform under shock wave[J].Journal of Huazhong University of Science and Technology,2015(2):71-75.
[12]郑长允,赵鹏远,赵红光,等.设备缓冲平台在水下爆炸载荷作用下冲击响应分析[J].科技导报,2012,30(18):37-40.DOI:10.3981/j.issn.1000-7857.2012.18.004.ZHENG Changyun,ZHAO Pengyuan,ZHAO Hongguang,et al.Shock response analysis of equipment buffer platform under underwater explosion loading[J].Science&Technology Review,2012,30(18):37-40.DOI:10.3981/j.issn.1000-7857.2012.18.004.
[13]CUI P,ZHANG A M,WANG S P.Small-charge underwater explosion bubble experiments under various boundary conditions[J].Physics of Fluids,2016,28(11):283.
[14]王军,姚熊亮,杨棣.浮动冲击平台冲击环境对设备响应的影响[J].爆炸与冲击,2015,35(2):236-242.DOI:10.11883/1001-1455(2015)02-0236-07.WANG Jun,YAO Xiongliang,YANG Di.Shock of shock platform on the response of equipment to[J].Explosion and Shock Waves,2015,35(2):236-242.DOI:10.11883/1001-1455(2015)02-0236-07.