CFD simulations of ships in high waves

With a growing competition in the marine industry, it is of great importance to have efficient methods of assessing new products. Hull design has traditionally relied on extensive model testing, but recent decades have shown that computational fluid dynamics (CFD) is a useful tool to reduce project costs and lead times. Since CFD simulations of a new hull geometry can be set up and run in a few days, they can play an important role in finding the right balance between parameters such as calm water resistance, propeller-hull interaction and seakeeping ability.

In this project, the CFD code  STAR-CCM+® has been used to study three similar fishing hulls in both calm water and in irregular waves described by the JONSWAP spectrum. The hulls have different bow geometries; two of them are equipped with bulbous bows while the third hull has a sharp bow geometry. Wave heights up to 9 meters are observed in the irregular wave simulations, resulting in large motion of the hulls where the resistance and acceleration are compared. After the wave analysis, the selected bow geometry was used to perform an optimisation of the aft geometry by means of calm water simulations. The aft geometry was updated in several steps in which small changes were implemented based on the simulation results.

In order to make realistic visualizations of hulls in motion, the open source software Blender has been used to render simulation results exported from STAR-CCM+. This post-processing method is a powerful tool that can be used to increase the credibility of computer aided engineering.

FS Dynamics is the leading CAE provider in Scandinavia. We focus solely on our company core competence, which are FEM and CFD computations in industrial applications.

Presenter(s): 
FS Dynamics
David Frisk
Session Time Slot(s): 
Time: 
07/03/2017 - 2:50pm-07/03/2017 - 3:15pm
Room: 
Convention Hall 1D
Presentation Image: 
Session Track: 

Session Tracks (STAR Global Conference 2017)

Co-Author(s): 
First Name: 
Fredrik
Last Name: 
Carlsson
Company / Institution: 
FS Dynamics