Abstract The ship model resistance test is carried out on the towing tank with a certain scale to get total coefficient of model. value ship’s form factor needed in extrapolation calculations and full-scale ship. can be obtained using traditional method, namely testing Froude Number between 0.1 – 0.2. This method known as Prohaska method. Another or more modern use multiple linear regression st...

Computational modeling is a valuable complementary tool to assess behavior of bottom trawl fishing gears. A simplified model of the gear that mainly affects to the net is proposed. The model is constrained to steady towing conditions, flat seabed and gear symmetry. Simulations proportionate a number of relevant outcomes like distribution of tensions at the warp, balance of forces at the otterbo...

The prediction and control of vortex-induced vibration (VIV) is one the key problems for riser design. effect platform heave motion on VIV deep sea top-tensioned (TTR) presented by means numerical simulation experiment in this research. First, was modeled as a parametric excitation, governing equation considering excitation established. Then, dynamic response TTR calculated numerically finite d...

Abstract An alternative twin rudder system known as the Gate Rudder© has been applied to newbuild vessels and an existing ship with aim improve their hydrodynamic performance reduce greenhouse gas emissions. The consists of two asymmetric cross-sections L-shaped blades located either side a propeller. generate thrust (duct effect) from propeller ship-included flow. Initially, forces moments sin...

Dynamical relation between ship's motions and warp tension while towing a trawl net was identified by the use of statistical method to be the multivariate AR model. Using this system identification method, the various towing system parameters were obtained by analysing the records of measuring ship's motions and warp tension during the fishing operations in several sea conditions. Based on thes...

Today, researchers exploit hybrid craft more than they used to be. The main reason is that they need to high speed as well as extra portability. For instance, a famous hybrid craft is named Hysucat, was designed through the combination of catamaran and hydrofoil. Catamarans, a type of multihull boats, have always considered by designers because of their simultaneous supply of high speed and sta...