Achieving a High Accuracy Numerical Simulations of the Flow Around a Full Scale Ship

Abstract

The hydrodynamic performance of ships may be improved by the retrofit of Energy Saving Devices (ESDs). These devices are typically seen in the aft part of the ship hull and act by lowering the ship resistance, conditioning the fluid in front of the propeller and/or recovering energy from the rotational swirl of the fluid leaving the propeller. In the case of a retrofit of an existing ship no straight forward solution exists. In order to find a beneficial design that will improve hydrodynamic performance, a successful and accurate initial assessment of the flow around a hull is of the most importance. Once the flow around the hull is scrutinized in detail, and required flow changes are determined, a ship designer can progress with designing an Energy Saving Device specifically tailored to have a desired effect. This paper presents a high quality numerical evaluation of the flow around a ship hull in the full scale using a sophisticated DES model that was successfully validated against the sea trials. The findings from the numerical analysis will identify the potential improvements in the hydrodynamic performance of the ship that could be achieved by ESD.

Virtual Replica of a Towing Tank Experiment to Determine the Kelvin Half-Angle of a Ship in Restricted Water

“…Moreover, as the ship speed is increased, the difference also grows. This matches the pattern observed in the sinkage and trim curves for a ship, both theoretically [53,54] as well as numerically [55]. Turbulence modelling is also a source of error in the results presented herein.…”

“…More sophisticated modelling approaches, such as those accounting for transition or those resolving large parts of the turbulent kinetic energy spectrum, should be used to assess the sensitivity of the adopted approach to turbulence modelling. Recent studies have demonstrated that the latter approach can be highly beneficial in terms of accuracy [55].…”

Pengaruh Thrust Deduction Factor Dan Wake Fraction Terhadap Efisiensi Propulsi Akibat Perubahan Draft Kapal

“…Sistem propulsi terdiri dari sistem penggerak utama, sistem transmisi dan propulsor. Ketiga sistem ini merupakan satu kesatuan yang tidak dapat dianalisis secara terpisah saat merancang kapal (Pena, et al, 2019). Dampak yang ditimbulkan karena kesalahan dalam perencanaan sistem propulsi antara lain berkurangnya nilai ekonomis kapal, tidak tercapainya kecepatan yang direncanakan serta konsumsi bahan bakar yang tidak efisien (Andersson, et al, 2018).…”

Detailed analysis of the flow within the boundary layer and wake of a full-scale ship

“…This work uses the Improved Delayed Detached Eddy Simulation (IDDES) turbulence modelling strategy and following the approach described in previous work (Pena et al, 2019;Pena et al, 2020).…”