Numerical Flow Characterization around a Type 209 Submarine Using OpenFOAM

The safety of underwater operation depends on the accuracy its speed logs which location probe and calibration thoroughness. Thus, probes are placed in areas where flow water is smooth, continuous, without high velocity gradients, air bubbles, or vortical structures. In present work, around two different submarines numerically described deep-water near-surface conditions to identify hull zones could be installed. First, numerical setup a multiphase solver supplied with OpenFOAM v7 was verified validated using DARPA SUBOFF-5470 submarine at scaled model including sail configuration H/D=5.4 Fr=0.466. Later, grid sensitivity resistance assessed for full-scale Type 209/1300 H/D=0.347 Fr=0.194. Free-surface effect characteristics evaluated by comparing operational conditions. Results shows that bow near free-surface regions should avoided due gradient, pressure fluctuations, large turbulent Moreover, stronger close nose. conclusion, installed acceleration region local 15% higher than navigation surface condition. A 4% correction factor applied readings compensate effect.