Reynolds-averaged Navier–Stokes simulation of hydrofoil effects on hydrodynamic coefficients of a catamaran in forced oscillation

Abstract

Determination of high-speed crafts' hydrodynamic coefficients will help to analyze the dynamics of these kinds of vessels and the factors affecting their dynamic stabilities. Also, it can be useful and effective in controlling the vessel instabilities. The main purpose of this study is to determine the coefficients of longitudinal motions of a planing catamaran with and without a hydrofoil using Reynolds-averaged Navier-Stokes method to evaluate the foil effects on them. Determination of hydrodynamic coefficients by experimental approach is costly and requires meticulous laboratory equipment; therefore, utilizing the numerical methods and developing a virtual laboratory seem highly efficient. In this study, the numerical results for hydrodynamic coefficients of a high-speed craft are verified against Troesch's experimental results. In the following, after determination of hydrodynamic coefficients of a planing catamaran with and without foil, the foil effects on its hydrodynamic coefficients are evaluated. The results indicate that most of the coefficients are frequency-independent especially at high frequencies.

Experimental optimization of hydrodynamic performance of catamarans using hydrofoil element

“…The results showed that increasing the frequency caused to decrease this coefficient and tends to a constant value. 24 Reviewing published researches, one can see lack of using research outcomes in constructed vessels. In this research, the authors tried to implement the extracted results from laboratory in the main vessel and had been tried to extract the new results.…”

“…The results showed that increasing the frequency caused to decrease this coefficient and tends to a constant value. 24…”