Innovation & Quality


Team 188:
Prediction of Barehull Resistance Curve of
a Day-Cruise Ship
in the Cloud 

 

“The high accuracy of NUMECA’s FINE/Marine software, combined with the powerful processing UberCloud machine is an absolutely fantastic tool.

It offers an opportunity for engineers to keep an absolute control & knowledge on their projects in the Marine Hydrodynamic Environment.”

MEET THE TEAM

End User – Costas Carabelas Technical Office (CCTO), ship design office, Athens, Greece

Team Expert – Vassilios Zagkas, SimFWD Engineering Services, Athens, Greece

Software Provider – Aji Purwanto, Business Development Director, NUMECA International S.A.

Resource Provider – Richard Metzler, Software Engineer, CPU 24/7 GmbH

Technology Experts – Hilal Zitouni Korkut and Fethican Coskuner, UberCloud Inc.

 

SimFWD is a research, development and application company, providing engineering services in the transport and construction industries. The company focuses on computer aided engineering technologies such as CFD and FEM applied to Ship Design. SimFWD can provide turnkey solutions to complicated generic problems in a cost effective manner, eliminating the overheads normally associated with a dedicated engineering analysis group or department. SimFWD aims at helping customers develop product designs and processes by supplying them with customized engineering analysis and software solutions. www.simfwd.com.

 

Costas Carabelas Technical Office (CCTO) is a ship design office based in Athens, Greece. CCTO is actively involved in numerous projects in the marine and offshore sector.

USE CASE

Objective 1 of this case study was to calculate the calm water resistance of a new small range Cruise Ship concept hull (~90m overall length). The hull-form was developed by CCTO and was specifically designed to combine high capacity and good cruising speed between multiple destinations. Listed below are the main dimensions:

        L.O.A.:                                        87.00    (m)  

        Breadth:                                    14.40    (m)  

        Service Speed:                          17.00    (kn) 

        Draught:                                    3.900    (m)

        Block Coefficient (T=3.90):      0.57

Objective 2 was for the end-user CCTO to get familiarized with the use of FINE/Marine in an UberCloud application software container and compare the cost benefit in comparison to resources currently in use. The benchmark was analyzed on the bare-metal cloud solution offered by CPU 24/7 and UberCloud. All simulations were run using version 4.1 of NUMECA’s FINE/Marine software.

SimFWD provided support to CCTO in setting up the FINE/Marine model and simulation parameters, having as a goal the generation of an initial Power Curve in short time. This shall be a good helping point at this design stage and shall be later enhanced by Self-Propulsion tests in FINE/Marine and verified by model tests.

CHALLENGES AND BENEFITS

The case study was completed without facing any difficulties whatsoever. The entire process right from the access to files in the UberCloud container, running the jobs in the CPU 24/7 Cloud, up to the retrieval of results to a local workstation was very convenient and without any delays. The user-friendliness of the interface was major advantage!

SIMULATION PROCESS AND RESULTS

Computations on the hull-form were performed for 5 different speeds – 13kts, 15kts, 17kts, 19kts, and 20kts. All computations were performed using a fluid domain consisting of approximately 1 million cells except for a speed of 19kts, where a finer mesh containing approximately 2 million cells was additionally computed. Shown below are results for a speed of 19kts:

Fig. 1 Travelling shot at 19knots: Wetted Surface 676 m²

Parameters | Speeds

 

19.0 kts

FINE/Marine global, Resistance

Units

 

 

Rt (Fx)

[N]

 

417902

Trim (Ry1)

[deg]

 

-0.2300

Sink (Tz)

[m]

 

3.7600

ΔSink (Tz)

[m]

 

-0.1400

Fig. 2 Wave Elevation along hull length X.

 

Fig. 3 Streamlines colored by the relative velocity.

 

Hull Pressure Effects

The bow hull pressure has a normal distribution over the most affected regions, bow front and stem near the waterline entrance.

 

Fig. 4 Overall Hull Pressure