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Tokyo 2015

a Workshop on CFD in Ship Hydrodynamics

Background

International workshops on numerical methods in ship viscous flow have been held regularly over a long period of time. In 1980, 1990 , 2000, 2010 the workshops were held in Gothenburg, while in 1994 and 2005 they were held in Tokyo. This document outlines the next workshop in the series, to be held in Tokyo 2015. As before the objective is to compare results of state-of-the-art numerical methods for a number of well specified test cases to assess the capabilities of the methods and to find the best way forward.

Date and venue

December 2-4, 2015 in Tokyo

Organizers

National Maritime Research Institute, Tokyo, Japan
Yokohama National University, Yokohama, Japan
Chalmers University of Technology, Gothenburg, Sweden
IIHR, Iowa City, Iowa, USA
ECN, Nantes, France
KRISO, Daejeon, Korea

Format

All participants are supposed to deliver computed results for one or more of the test cases below. These results will be compiled by the organizers and presented in a common format for easy comparison. The organizers will also make an assessment of the computations for each hull and present that at the workshop for general discussion. No papers will be presented at the workshop, but they will be included in the proceedings. At the workshop methods and computations will be presented in the form of posters.

Hulls

The sinlge same hull as in the 2010 workshop and two new hulls will be used, namely:

1) The Japan bulk carrier : JBC

2) The Korean container ship designed at KRISO: KCS

3) The ONR tumblehome ship: ONRT

Overview of test cases

		Computation	Type	JBC 1	KCS 2		ONRT 3
		Computation	Type	JBC 1	Calm	Wave	ONRT 3
Calm water	Towing	w/o ESD: Resistance, sinkage & trim	1	1.1	2.1
		With ESD: Resistance, sinkage & trim	2	1.2
		w/o ESD: Mean velo- cities, turbulence, waves (incl. breaking)	3	1.3
		With ESD: Mean velo- cities and turbulence	4	1.4
	Self-prop.	w/o ESD: Thrust, torque, propulsive coefficients, sinkage & trim	5	1.5	2.5
		With ESD: Thrust, torque, propulsive coefficients, sinkage & trim	6	1.6
		w/o ESD: Mean velo- cities and turbulence	7	1.7	2.7
		With ESD: Mean velo- cities and turbulence	8	1.8
	Free-run.	Thrust, torque, propulsive coefficients, sinkage & trim	9				3.9
Regular Waves	Captive Head waves	Motions and added resistance	10			2.10
	Captive Beam, follow, oblique waves	Motions and added resistance	11			2.11
	Free-run. Head waves	Thrust, torque, rpm, motions, speed loss	12				3.12
	Free-run. Beam, follow, oblique waves	Thrust, torque, rpm, motions, speed loss	13				3.13

Green: G2010 case, Red: New case

Details of test cases

Mandatory cases are denoted by '*'.

For JBC, the NMRI cases should be computed first.
For KCS, seakeeping, the FORCE case should be computed first.
For ONRT, the calm water and gead waves should be computed first.

The notation for the hull attitude is as follows:

FX₀ = Fixed at zero sinkage and trim
FR₀ = Free condition simulated by adjusting ballast weight to obtain zero sinkage and trim at designated speed
FX_{σ τ} = Fixed at dynamic sinkage and trim
FR_{z θ} = Free in heave and pitch
FR_all = Free in all degrees of freedom

The following table summarizes the requested computations. It should be noted that it is up to each participant to select which ones of the cases to compute.

Case

Hull

Condition

Attitude

Validation variables

Data provider

1.1

JBC w/o ESD

Towed in calm water

FR_{z θ}

Resistance, sinkage & trim

NMRI*/OU

1.2

JBC with ESD

Towed in calm water

FR_{z θ}

Resistance, sinkage & trim

NMRI*/OU

1.3

JBC w/o ESD

Towed in calm water

FR_{z θ},FX₀

Mean velocities, turbulence and wave patterns

NMRI*/TUHH/OU

1.4

JBC with ESD

Towed in calm water

FR_{z θ},FX₀

Mean velocities and turbulence

NMRI*/TUHH/OU

1.5

JBC w/o ESD

Self propelled in calm water

FR_{z θ},FX₀

Thrust, toque, propulsive coefficients, sinkage & trim

NMRI*/TUHH/OU

1.6

JBC with ESD

Self propelled in calm water

FR_{z θ},FX₀

Thrust, torque, propulsive coefficients, sinkage & trim

NMRI*/TUHH/OU

1.7

JBC w/o ESD

Self propelled in calm water

FR_{z θ},FX₀

Mean velocities and turbulence

NMRI*/TUHH/OU

1.8

JBC with ESD

Self propelled in calm water

FR_{z θ},FX₀

Mean velocities and turbulence

NMRI*/TUHH/OU

2.1

KCS

Towed in calm water

FR_{z θ}

Resistance, sinkage & trim

KRISO*/NMRI*

2.5

KCS

Self propelled at ship point in calm water

FR₀

Thrust, torque and propulsion coefficients

NMRI*

2.7

KCS

Self propelled at ship point in calm water

FR₀

Mean velocities

NMRI*

2.10

KCS

Captive towed in head waves

FR_{z θ}

C_T, heave and pitch

FORCE*

2.11

KCS

Captive towed in beam, follow, oblique waves

FR_xzφθ

C_T, surge, heave, roll and pitch

IIHR

3.9

ONRT

Free running in calm water

FR_all

Thrust, torque, propulsion coefficients, sinkage & trim

IIHR*

3.12

ONRT

Free running in head waves

FR_all

Thrust, torque, rpm, motions, trajectory

IIHR*

3.13

ONRT

Free running in beam, follow, oblique waves

FR_all

Thrust, torque, rpm, motions, trajectories

IIHR

Green: G2010 case, Red: New case

Questionnaire

As in the previous workshops a questionnaire with detailed questions about the method will be distributed to each participant. The answers will be summarized in a table for easy access at the workshop.

Invitation

The workshop is open for all groups interested in carrying out viscous flow computations for one or more of the hulls specified.

Information

For further information, please contact the secretary, email: cfdws15@nmri.go.jp.