Estimativa da resistência ao avanço de um catamarã com Abordagem computacional baseada em cfd

Abstract

Measuring ship resistance has been a complex task for decades. Due to the phenomena involved, which involve fluids flow. Predict the force that opposes the movement of a vessel in the water is important to know what will be the power required to overcome it. However, the most reliable techniques currently available are the experimental methods which involving high cost and long time. For multihull type vessels, this task is even more difficult, because many of the experimental tests are still in development. In addition, for twin-hulled vessels the wave making resistance will be a very important factor, also attention must be paid to the the wave train interaction between the hulls. The use of computational methods has been increasing in the last years. Due to its ability to show approximate results to those found in real life, therefore, they can be used in the initial phase of the Project to estimate the power required for the ship. However, it is not advisable to use it as a decisive factor, because as will be seen, the results are not accurate, those are methods that show similar values in the practice. This study aims the calculation of a catamarã resistance through the use of computational fluid dynamics and compare two numerical methods, Hullspeed R and ANSYS R CFX. The results found about 9,91KN and 31KN respectively for Hullspeed and 23KN and 37KN for CFX.