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哈尔滨工程大学学报（英文版） 2024年第2期23卷 316-326页

作者： F.Mannacio F.Di Marzo M.Gaiotti C.M.Rizzo M.Venturini Italian Navy Naval Support and Experimentation CentreCSSN Viale S.Bartolomeo40019126 La Spezia(Italy) University of Genova Polytechnic SchoolDITEN Via Montallegro116145 Genova(Italy).

Despite the non-contact underwater explosion phenomena(UNDEX)have been studied for decades and several numerical methods have been proposed in literature,its effects on military structures,especially composite ones,are even nowadays matter of *** early design phases,it is not always possible to verify the shock resistance of hull structures modelling the whole phenomenon,in which fluid,gas and solid properties must be properly set in a fully coupled fluid-structure interaction(FSI)numerical *** ones are extremely complex to set,computationally demanding and certainly not suitable for everyday design *** this paper,a simplified finite element(FE)model,easy to use in an early design phase,is ***,the structure and the fluid are *** this approximation,the fluid behaviour is simplified,using special finite elements,available in a commercial software *** choice reduces the computational time and numerical efforts avoiding the problem of combining computational fluid dynamics(CFD)and FE domains and equations in a fully coupled fluid-structure interaction model.A typical parallel body block of a minesweeper is modelled,using two-dimensional multi-layered shell elements to properly account for the composite materials *** the fluid instead,three dimensional volumetric elements,directly coupled to the structural elements,are *** addition,the same calculation is performed,modelling separately fluid in the CFD environment and structures in the finite element ***,realizing a fully coupled fluid-structure interaction *** results obtained by applying both numerical models are compared with the structural response measured on board of a composite ship during a full-scale shock *** simplified proposed procedure provides results in satisfactory agreement with experiments,allowing the validation of the *** are discussed and differences with the real phenomenon and fully coupled CFD+

关键词： underwater explosions Shock resistance Composites Fluid-structure interaction Experimental analysis Numerical simulation Vulnerability Preliminary design

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3-D NUMERICAL SIMULATION OF underwater EXPLOSION BUBBLE

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Chinese Journal of Aeronautics 1996年第1期9卷 38-42页

作者： Lu Chuanjing(Shanghai Jiao Tong University, Shanghai, China, 200030) Shanghai Jiao Tong University Shanghai 200030 China

The problem is solved by use of the boundary integral equation method and the high order finite element discretization on the assumption that the flow of water is inviscid, incompressible and irrotational, and the bubble gas obeys the isoentropic rule. The evolution of bubble is simulated by means of mixed Euler-Lagrangian method. The comparison of the numerical results with the 'exact solution' of a spheric bub ble and experimental data shows that the mathematical model is reasonable and the 3-D numerical method has high accuracy. Important behaviour of bubble, such as immigration and jetting, and dynamic load on an ellipsoid near explosion are derived.

关键词： underwater explosions bubbles potential flow boundary integral method

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Blast Pressure Measurements of an underwater Detonation in the Sea

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Journal of Marine Science and Application 2021年第4期20卷 706-713页

作者： Alpaslan Tatlısuluoğlu Serdar Beji Ph.D.student at I.T.U.and underwater Search and RescueCommand TR-34469 IstanbulTurkey Faculty of Naval Architecture and Ocean Engineering Istanbul Technical UniversityTR-34469 IstanbulTurkey

Blast pressure measurements of a controlled underwater explosion in the sea were carried *** explosive of 25-kg trinitro-toluene(TNT)equivalent was detonated,and the blast pressures were recorded by eight diferent high-performance pressure sensors that work at the nonresonant high-voltage output in adverse underwater *** peak pressure values are used to establish a relationship in the well-known form of empirical underwater explosion(UNDEX)loading *** of the formula are redetermined by employing the least-squares method in two diferent forms for best ftting to the measured *** newly determined constants are found to be only slightly diferent from the generally accepted ones.

关键词： underwater explosions High-pressure shock waves Efects of directionality on blast pressure records Pressure loading formulas Applications of the least-squares method

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