Seakeeping Prediction of a Survey Vessel Operating in the Caspian Sea

Abstract

This paper presents the numerical and experimental analysis of the seakeeping performances of a survey vessel operating in the Caspian Sea. For the numerical analysis we have developed our own code, based on a linear hydro-dynamic strip theory formulation. The irregular waves are modelled by short-term power density spectra JONSWAP, for the spectral parameters significant wave height and peak period corresponding to the Caspian Sea scattering diagram. The experimental study is developed at the towing tank from Naval Architecture Faculty of Galati, using a semi-captive scaled model 1:16 of the survey vessel, made of fibre glass and wood, being recorded the heave, pitch, roll motions and wave elongation. The experimental tests are carried out for two speeds and several significant heading cases: head, follow and beam regular waves. This study delivers the prediction of the survey vessel seakeeping capabilities and the validation of the numerical response amplitude operators by experiment.

Comparative analysis of seakeeping methods: numerical, software simulation and experimental study

“…The model used for the towing tank experiments was scaled down to a 1:16 ratio, maintaining geometric similarity and ensuring accurate Fig. 1 Survey model CAD geometry [8].…”

“…The comparison focused on the accuracy and reliability of these numerical approaches in forecasting the ship's motions and the forces acting upon it in waves. By examining the results under various conditions, the study sought to understand the dynamics of ship motions and the effectiveness of simulation tools in a rather controlled environment, contributing to the advancement of the studies and numerical approaches in naval architecture and marine engineering practices [8].…”

On operation capabilities analysis of a 100000 tdw tanker by seakeeping criteria

“…The seakeeping simulations are done by our own program DYN [6], module OSC, for ship's oscillations in regular and irregular waves, statistical short-term results, based on a linear strip theory hydrodynamic model, presented in brief in section 2. The program DYN-OSC has been previously validated by several experimental tests on scaled models, at towing tank, in regular head, follow and beam wave conditions, with the results presented in references [3], [7], [9], [12]. The parametric study aims to test the sensitivity of the operation limits of the 100000 tdw tank, due to the changes of several navigation data.…”

On the river barge of 3000 T preliminary seakeeping approach

“…The river barge has an almost prismatic shape. Table 2 presents the required seakeeping limit values used for the preliminary simplified evaluation of the river barge of 3000 T. The preliminary seakeeping analysis of the 3000 T river barge is done by a linear strip theory approach implemented in own DYN(OSC) code [3], validated by several tests [4], [5].…”