Session: 08-02-02 Ship & Floating Systems

Paper Number: 104777

104777 - Preliminar Assessment of the Effect of Bottom Warp on the Dynamics of Planing Hulls Using OpenFOAM 

The prediction of the dynamics of High-Speed Craft (HSC) with prismatic hulls is commonly performed by designers using semi-empirical formulations based on Savitsky’s classic method. However, the accuracy of this prediction decreases if deadrise of the hull change along its length, which is typical for small passenger ferries, even when considering the effective deadrise and trim angle concept proposed by Savitsky in 2012. The present work will assess the dynamics of three planing hulls developed by the University of Naples, with a warp rate between 2.8 and 7.6 degrees per beam change of deadrise, using a morphing grid approach implemented in OpenFOAM to capture the motion of the vessel. Numerical results on resistance, wetted area, dynamic trim angle, wall shear stress, and pressure distribution will be compared with the method proposed by Savitsky, and previously published results where possible. In the present work, it is expected to improve the understanding of the physics of the flow around warped planing hulls and to identify changes on the effective deadrise and trim angle for hull with a wider range of warp rates. This work could be considered as an initial step to assess seakeeping response of warped hulls on open sea conditions.

Presenting Author: Rubén José Paredes Alvarado ESPOL Polytechnic University, Escuela Superior Politécnica del Litoral, ESPOL

Presenting Author Biography: Dr. Ruben Paredes got his degree in Naval Engineering at ESPOL University in Ecuador in 2006. He did his MSc. Degree at the University of Sao Paulo and in 2013 he was awarded his PhD in Ocean Engineering at the Stevens Institute of Technology. His PhD focused on fluid-structure interaction problems involving hydroelastic response using Smoothed-Particle Hydrodynamics. He was a postdoctoral researcher at the Massachusetts Institute of Technology for three years. Since 2016, he is a lecturer of Fluid Dynamics and Ship Dynamics at the ESPOL University. Currently, he is leading a research project aiming to design a Zero Emission HSC for Galapagos.

Authors:

Rubén J. Paredes ESPOL Polytechnic University, Escuela Superior Politécnica del Litoral, ESPOL
David Plaza ESPOL Polytechnic University, Escuela Superior Politécnica del Litoral, ESPOL
Jose R. Marin ESPOL Polytechnic University, Escuela Superior Politécnica del Litoral, ESPOL
Ermina Begovic University of Naples Federico II
Raju Datla Stevens Institute of Technology