关键词:
computational fluid dynamics(CFD)
free surface
irregular waves
stratified fluid
wake
摘要:
In realistic submarine operating environments, water density varies vertically due to temperature and salinity gradients. To investigate submarine hydrodynamic characteristics under actual sea conditions, this study employs STAR-CCM+ computational fluid dynamics software to solve RANS equations coupled with a turbulence model, simulating submarine navigation through density-stratified fluids under irregular waves. First, a numerical wave tank was established utilizing artificial damping for wave absorption, with irregular waves generated using a JONSWAP spectrum. Significant wave height and period parameters were calculated to synthesize wave spectra, demonstrating close agreement between simulated results and theoretical spectra within acceptable error margins, thereby validating the wave generation methodology. Subsequently, density stratification was implemented through depth-dependent density functions, enabling comparative analysis between stratified and homogeneous fluid conditions. Finally, numerical simulations of submarine navigation under Sea State-3 condition were conducted in both homogeneous and stratified fluids. The results reveal the significant effects of density stratification on submarine hydrodynamic performance and free-surface wave patterns under irregular wave excitation. © 2025 Editorial office of Ship Building of China. All rights reserved.