附体对分层流中潜艇水动力特性的影响

The effect of appendages on the flow field and resistance characteristics around submarine in density stratified fluid is investigated. A Reynolds-averaged Naiver-Stokes-based CFD model was established for simulating the navigation of submarine in density stratified fluid. The convergence study was carried out with a SUBOFF submarine model, and the proposed numerical model was validated by comparing with experimental data. The hydrodynamic characteristics of submarine with different appendages navigating at various speeds were simulated, and the simulated results were analyzed combined with the changes of pressure. Results shows that the effect of appendages on hydrodynamic characteristics of submarines is related to navigational speed; the coefficients of wave-making resistance of submarine reach the highest around Fr (Froud number)=0.5. The sharp curvature around appendages on the surface of submarine causes sharp change of pressure. The proposed model shows the hydrodynamic characteristics of submarine navigation, and can be used for the selection of simulation method for navigation of submarine in density stratified fluid and the design optimization of submarine appendages.