One of the challenges of crafts at high speeds is the porpoising phenomenon. In this research, the effect of the hydrofoil stabilizer on the dynamic coordinates of the craft and the amount of porpoising at different speeds is investigated. The purpose of this research is to design this type of hydrofoils and one of the effective solutions to achieve high speeds and its effect on the dynamic coordinates of the craft by using software.
In this research, by using the articles and these related to the subject of this thesis, it was done to compile the information and then using the data validation software, and they were used in the writing of the thesis. Also, at the end of the research, the results, which include software reports, and after ensuring the accuracy of the results, data registration and final writing have been done.
Many geometrical parameters have been taken into consideration in the design of the hydrofoil stabilizer. Among these parameters, we can mention the height of the hydrofoil from the water surface, the longitudinal position of the hydrofoil from the craft's heel, the angle of attack, the aspect ratios, the ratio of the middle width in angled hydrofoils, etc. Each of these parameters is modeled in its position with geometry design software (Rhino, CATIA) and simulated with numerical solution software (STAR-CCM). By comparing the results of the simulation of heave and pitch diagrams of the craft, the importance of each of the design parameters was realized.
From the comparison of the results obtained from the simulation and the diagrams of the craft's heave and pitch, it is clear that the degree of importance of each of the design parameters is that increasing the height above the water surface, increasing the angle of attack and increasing the width of the hydrofoil are effective in reducing the longitudinal instability and the craft reaches a stable state faster. Also, increasing or decreasing the middle width of the angular hydrofoil has not h