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Resistance and Flow

  • Martin Renilson
Chapter

Abstract

The resistance of a submarine will have a major influence on its top speed, endurance, and acoustic signature. The various components of resistance include: surface friction; form drag; induced drag; and wave making resistance. The latter only becomes important when the submarine is operating on, or close to, the water surface. The flow over a submarine will influence its top speed, its acoustic signature, and the effectiveness of its own sensors. In particular, flow separation should be avoided. A submarine hull is usually considered in three parts: fore body; parallel middle body; and aft body. The main driver for the hydrodynamic design of the fore body is to control the flow such that there is laminar flow over the sonar array. A fuller fore body may be beneficial for this. The length of the parallel middle body influences the length to diameter ratio, and it is shown that there is an optimum value of the L/ D to minimise resistance, depending on the hull form. The aft body shape can be characterised by the half tail cone angle, which defines its fullness. The primary aim of the design of the aft body is to avoid flow separation, and ensure good flow into the propulsor. Appendages contribute significantly to the hull resistance. In addition, they generate vortices which can have a detrimental effect on the flow around the hull, and in particular into the propulsor. Model testing and Computational Fluid Dynamics techniques are discussed. In addition, an empirical method of predicting the resistance of a submarine, suitable for use in the early stage of the design, is presented.

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Australian Maritime CollegeUniversity of TasmaniaLauncestonAustralia

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