Numerical simulation on the structural response of a torpedo at the moment of vertical water entry

HE Zheng; GAO Ziqing; GU Xuan; GAO Zishu

doi:10.11883/bzycj-2022-0506

Volume 43 Issue 7

Jul. 2023

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HE Zheng, GAO Ziqing, GU Xuan, GAO Zishu. Numerical simulation on the structural response of a torpedo at the moment of vertical water entry[J]. Explosion And Shock Waves, 2023, 43(7): 073303. doi: 10.11883/bzycj-2022-0506

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HE Zheng, GAO Ziqing, GU Xuan, GAO Zishu. Numerical simulation on the structural response of a torpedo at the moment of vertical water entry[J]. Explosion And Shock Waves, 2023, 43(7): 073303. doi: 10.11883/bzycj-2022-0506

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Numerical simulation on the structural response of a torpedo at the moment of vertical water entry

doi: 10.11883/bzycj-2022-0506

College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, Heilongjiang, China

Received Date: 2022-11-12
Rev Recd Date: 2023-04-08

Available Online: 2023-04-11

Publish Date: 2023-07-05

Abstract

Abstract

The torpedo may be damaged by impact while entering the water. Due to changes in shape, the place where cabins are connected is more stressed and is usually more dangerous. The trajectory of a torpedo is stable when it enters the water vertically for a short time. Based on this, the axial motion and mechanical characteristics of the torpedo’s cabins and connecting parts were studied. Firstly, the arbitrary Lagrangian-Eulerian (ALE) algorithm and penalty function method were used to establish the numerical model of fluid-structure coupling calculation, and its effectiveness was then verified by comparing it with the existing experiment. Next, four sets of solid grids and five sets of fluid grids were established, and the changes of the maximum acceleration and the maximum pressure were analyzed. The independence of the grid was verified through comparison. The vertical water-entry processes of the torpedoes with different head shapes and connection forms were simulated and compared with those of integral torpedoes. The results show that the acceleration increases instantaneously after the torpedo hits the water, then fluctuates in the positive and negative directions around zero and becomes smaller and smaller. The sharper the head, the weaker the impact. The response characteristics of each cabin are different. Since the stress is transmitted backward in the form of waves, the response order of each cabin depends on the distance from the head, and the strength will gradually decrease. The adjacent shells are no longer relatively stationary, and the connector between them will be continuously pulled and pressed, leading to significant changes in their appearances and positions. When the adjacent shells tend to move away from each other, there will be gaps, and the stress of the connectors will also reach the maximum, which is dangerous to the torpedo. It is recommended to add sealing rings or other fixed devices in the project to strengthen the protection of connection parts.
- trans-media torpedo,
- vertical water entry,
- arbitrary Lagrangian-Eulerian algorithm,
- connection structure

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References(35)

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