Parallel-middle-body and Stern-form Relative Significance in the Wake Formation of Single-screw Large Ships

Abstract

The relative significance of the parallel middle body and stern form in the wake formation of single-screw large ships and their contribution to the ship's viscous resistance are studied by using computational fluid dynamics (CFD). A 10450-DWT tanker is considered by varying the ratio of the parallel-middle-body's length to the ship's length (L mb /L) and by varying the shape of the stern form from a V-like to a U-like underwater stern transom section. In all the calculations, the principal dimension and the displacement of the ships are kept constant. A larger value for the parallel-middle-body relative length (L mb /L) of ships with the same stern form results in a larger drag coefficient but does not affect the nominal wake fraction significantly. A change in the shape of the underwater stern form, from a V-like to a U-like section, results in a much larger drag coefficient ascribed to the much larger wake fraction. The stern form dominantly affects the nominal wake fraction and the ship's viscous resistance compared to the parallel-middle-body relative length.

Effects of the Application of a Stern Foil on Ship Resistance: A Case Study of an Orela Crew Boat

“…In ship design, one of the key optimization variables is the minimization of ship resistance, which can be achieved through an optimal hull-form design (Campana et al, 2017;Diez et al, 2017;Suastika et al, 2017) or by the application of devices such as bulbous bows, trim wedges, interceptors, or more recently the Hull Vane  (Uithof et al, 2016;Uithof et al, 2017). The focus of the present study is on the application of a stern foil (the Hull Vane  ) as a resistancereduction device (or fuel-saving device).…”

Resistance Characteristics of Submerged Projectile with Bow Variation based on Hull Envelope Equation using Steady RANS Simulation

“…Furthermore, involving additional analysis, such as the relation of the fluid around the bow to propulsion efficiency, would be considered worthy of examination, since the form of a hull affects the wake formation behind the self-propulsion object, as well as its resistance (Suastika et al, 2017).…”

Toward Improvement of Resistance Testing Reliability

“…Then, the influence of two potential filters on the resistance results was investigated with a Kalman filter developed in MATLAB TM and a lowpass filter from Sigview signal analysis tools [11] for offline execution. The work builds on previous studies into benchmarks and uncertainty analysis for shipmodel resistance tests [12][13][14].…”