MODELING THE DEFORMATION PROCESS OF AN UNDERWATER GAS PIPELINE UNDER THE EXPLOSIVE LOADING

Author details

Abstract

The process of deformation of an underwater two-layer gas pipeline during the explosion of a nearby octogen charge is simulated. For modeling, a specially developed proprietary software package is used to solve three-dimensional dynamic problems of interaction of elastoplastic structures with compressible media, based on a single Godunov scheme of increased accuracy for calculating the joint motion of gas, liquid, and elastoplastic media. The package uses an Eulerian-Lagrangian approach with explicit identification of moving contact surfaces between different media. For each environment, three types of computational grids are used. These are Lagrangian surface meshes in the form of a continuous set of triangles for specifying the initial geometry of bodies and accompanying them during the calculation process, as well as two types of three-dimensional volumetric meshes automatically generated during the calculation process. The charge, which has a spherical form, is initiated at its center. To describe the process of propagation of steady-state detonation, the hydrodynamic theory of detonation is used. Shock waves generated during an explosion in the surrounding liquid interact with a fragment of a two-layer pipeline and a solid bottom. Wave processes are analyzed both in the steel pipe and in the concrete shell that weighs it down. Loads on the pipeline are estimated depending on the distance to the charge and the position of the pipeline relative to the bottom. The possible destruction of both steel and concrete weight shells in areas of tensile deformations that are formed in places of the maximum bending of the pipeline is shown. It is shown that the proximity of the bottom can significantly enhance the impact of explosive loading due to the action of shock waves reflected from the bottom.

Keywords

underwater gas pipelineexplosionthree-dimensional problemnumerical modelingGodunov schemeincreased accuracyEulerian-Lagrangian approachelastoplastic deformation.

Bibliography

  1. 1.Zamyshlyaev B.V., Yakovlev Yu.S. Dinamicheskie nagruzki pri podvodnom vzryve. [Dynamic loads during an underwater explosion]. Leningrad. Shipbuilding. 1967, 387 p. Scholar
  2. 2.Explosion Hazards and Evaluation W. E. Baker, et al. Elsevier Scientific Publishing Company Amsterdam – Oxford – New York 1983, 840 pp. doi: 10.1016/0010-2180(85)90099-9. Scholar
  3. 3.Surov V.S. Modeling of the interaction of an underwater shock wave and an obstacle in the presence of a bubble screen, J. Eng. Phys. Thermophys., 2016, 89, No. 1, pp. 90–99. doi: 10.1007/s10891-016-1355-2 Scholar
  4. 4.Otsenka parametrov udarnykh voln pri razrushenii morskikh i sukhoputnykh uchastkov magistral'nykh gazoprovodov [Estimation of parameters of shock waves during the destruction of offshore and onshore sections of main gas pipelines]. S.I. Sumskoy, et al. NTS. Vestnik gazovoy nauki – NTS. Bulletin of Gas Science, 2020, No. 3(45), pp. 72-79. Scholar
  5. 5.Abuzyarov K.M. Metod raspada razryvov v trekhmerny odniamke uprugoplasticheskikh sred [The method of decomposition of gaps in the three-dimensional dynamics of elastoplastic media]. Problemy prochnosti i plastichnosti – Problems of Strength and plasticity, 2020, Vol. 82, No 3, pp. 5-17. doi: 10.32326/1814-9146-2020-82-3-377-389 Scholar
  6. 6.Chislennaya metodika resheniya trekhmernykh zadach vzaimodevstyviya vysokoskorostnykh gazovykh struy s uprugoplasticheskimi pregradami [Numerical method for solving three-dimensional problems of interaction of high-speed gas jets with elastoplastic barriers]. M.Kh. Abuziarov, et al. Voprosy atomnoy nauki i tekhniki. Seriya: Matematicheskoe modelirovanie fizicheskikh protsessov – Problems of Atomic Science and Technology. Series: Mathematical modeling of physical processes, 2021, No. 4, pp. 24-40. Scholar
  7. 7.Chislennoe reshenie trekhmernykh zadach udarnogo vzaimodevstyviya uprugoplasticheskikh tel v eylerovykh peremennykh na baze modifitsirovannoy skhemy Godunova [Numerical solution of three-dimensional problems of impact interaction of elastoplastic bodies in Euler variables based on the modified Godunov scheme]. M.Kh. Abuziarov, et al. Voprosy atomnoy nauki i tekhniki. Seriya: Matematicheskoe modelirovanie fizicheskikh protsessov – Problems of Atomic Science and Technology. Series: Mathematical modeling of physical processes, 2023, No.3, pp.16-29. Scholar
  8. 8.Meyers A., Xiao H., Bruhns O.T. Choice of objective rate in single parameter hypoelastic deformation cycles Computers and Structures, 2006, Vol. 84, pp. 1134–1140. doi: 10.1016/j.compstruc.2006.01.012 Scholar
  9. 9.Primenenie skhemy Godunova dlya resheniya trekhmernykh zadach vysokoskorostnogo vzaimodevstyviya uprugoplasticheskikh tel. [Application of the Godunov scheme to solve three-dimensional problems of high-speed interactions of elastic-plastic bodies]. K.M. Abuzyarov, et al. Matematicheskoe modelirovanie – Mathematical models and computer simulations, 2023, Vol. 35, No 8, pp. 97–115. doi: 10.20948/mm-2023-08-07 Scholar
  10. 10.Chislennoe reshenie mnogomernykh zadach gazovoy dinamiki [Numerical solution of multidimensional problems of gas dynamics]. S.K. Godunov, et al. Moscow, Nauka Publ., 1976, 400 p. Scholar
Download PDF

Article information

Published
17 June 2024
Issue date
17 June 2024
Issue
No. 2 (2024)
Share