Geometrical optimization of submarine pressure hull considering one-way fluid-solid interaction

In this paper, the profile of the longitudinal and transverse sections of a submarine, which is located at a certain depth, based on the hydrodynamic pressure imposed on the submarine body by the fluid flow, from a structural point of view and considering the buckling resistance of the body under external pressure optimized. The calculation of hydrodynamic pressure has done using computational fluid dynamics analysis and body geometry optimization using ANSYS Workbench software. The pressure body of the submarine withstands almost the most pressure and hence it is considered to be made of polymer based composite material. Considering that the studied geometry and the type of loading (hydrodynamic load) in this article are complex, and analytical relationships for stress analysis are not available in this research, buckling is obtained using software calculations and by performing submarine stress analysis with the desired initial geometry, forces and stresses applied to the body have been calculated and hydrodynamically and structurally studied. Assuming 12 geometrical variables and minimizing weight and drag force as objective functions, by optimization methods, optimal longitudinal and transverse profile and this process is repeated until the desired values are reached. The results obtained in this article indicate that the use of non-circular shapes such as pseudo-ellipses in the design and construction of submarines can replace circular sections