Numéro : 2801 - Year : 2024
Simulation of a torpedo swim-out launching with a one-dimensional model using propellers thrust coefficients
Fabian PECOT, Thierry TAILLEFET, Sirehna – Nantes (France), Naval Group – Ruelle (France)
Among the various missions expected from a submarine, weapons launching from a tube is of major importance. To secure these launchings and to determine the safe operating envelope, numerical approach constitutes an interesting alternative to expensive model or full-scale trials. To predict ejection velocities and trajectories of torpedoes launched in swim-out, a fully CFD-based numerical methodology, including propeller rotation modelling, has been successfully developed. This methodology, validated on sea trials results, is currently in use at Naval Group. This method is accurate, but also costly in terms of calculation time, particularly in cases of high tube confinement.
A slightly less accurate but lighter alternative method, based on a 1D model, has therefore been developed to simulate the internal launching phase inside the tube and even in the submarine. Nevertheless, this method requires prior knowledge of the propeller thrust coefficients in confined space. To validate the 1D model, numerical results are compared with both CFD results and full-scale sea trials of swim-out launchings. These trials were carried out with a torpedo-like drone launched from a one-section horizontal tube immersed in sea water at rest. The results obtained with the 1D model simply using the thrust coefficients calculated in free space are very close to those both observed in CFD with propeller modelling and in sea trials.
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