Numerical simulation of submarine motions in three degrees of freedom in irregular waves for drag force estimation

Document Type : Original Article

Authors

1 PhD student، Isfahan Malik Ashtar University of Technology ، Isfahan، Iran

2 Assistant Professor, Isfahan Malek Ashtar University of Technology, Isfahan, Iran

3 Professor, Isfahan Malek Ashtar University of Technology, Isfahan, Iran

4 PhD, Isfahan Malek Ashtar University of Technology, Isfahan, Iran

Abstract

In this paper, the simulation of submarine motion near the free surface of water exposed to irregular waves has been done. In this article, URANS method with overset grid approach and volume fraction of fluid method have been used to simulate the free surface of water in Star CCM software. The geometry studied in this simulation is the Sobuff submarine model with fully appendages. Since the freedom of motion of the submarine can have a significant effect on the results of the drag force, the simulations are performed in the case that the submarine is free in the three directions of heave, pitch and roll, and the drag force has been calculated. Also, the effect of different encounter angles and characteristics of waves on the drag force has been investigated. The results show that with the increase in the range of pitch motions due to the increase in the height of the wave, the drag force also increases. In addition, in following waves, the fluctuation of the drag force is minimal, and the maximum value of the calculated drag force is in head waves. In waves with a characteristic height of 0.43 meters, the maximum drag force in head waves is 444 N and in beam waves is 322 N. The results show that with the increase in the significant height of the waves, the drag force also increases.
 

Keywords


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  • Receive Date: 03 October 2023
  • Revise Date: 21 December 2023
  • Accept Date: 19 January 2024
  • Publish Date: 19 February 2024