Gothenburg 2010
a Workshop on CFD in Ship Hydrodynamics
International workshops on numerical methods in ship viscous flow have been held regularly over a long period of time. In 1980, 1990 and 2000 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 Gothenburg 2010. 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
8-10 December 2010 in Gothenburg
Organizers
Chalmers University of Technology, Gothenburg, Sweden
IIHR, Iowa City, Iowa, USA
INSEAN, Rome, Italy
Co-organizers
-
ECN, Nantes , France
Osaka University, Osaka, Japan
MOERI, 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.
The same hulls as in the 2005 workshop will be used, namely:
1) The Korean VLCC designed at MOERI: KVLCC2
2) The Korean container ship designed at MOERI: KCS
3) The US combatant model : 5415
The following types of computations will be requested:
1) Local flow at fixed condition, either zero sinkage and trim (FX0 ) or dynamic sinkage and trim (FXσ τ)
2) Resistance, sinkage and trim either at FX0 or at heave and pitch free condition (FRz θ )
3) Self propulsion at FX0 or FRz θ
4) Heave and pitch in waves either at FRz θ or FRx z θ
5) Forward speed diffraction at FXσ τ
6) Free roll decay at FXσ τ and FRφ
The notation for the hull attitude is as follows:
FX0 = fixed at zero Sinkage and Trim
FXσ τ = fixed at dynamic Sinkage and Trim
FRz θ = free to heave and pitch
FRx z θ = free to surge, heave and pitch
FRφ = free to roll
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 Number |
Hull |
Attitude |
Measured quantity |
1.1a |
KVLCC2 |
FX0 |
Mean velocity, Reynolds stresses (Postech WT) |
1.1b |
KVLCC2 |
FX0 |
Wave pattern (MOERI) |
1.2a |
KVLCC2 |
FX0 |
Resistance (MOERI) |
1.2b |
KVLCC2 |
FRz θ |
Resistance, sinkage and trim (MOERI) |
1.4a |
KVLCC2 |
FRz θ |
Pitch, heave, added resistance (INSEAN) |
1.4b |
KVLCC2 |
FRz θ |
Pitch, heave, added resistance (NTNU) |
1.4c |
KVLCC2 |
FRx z θ |
Surge, Pitch, heave, added resistance (Osaka Univ) |
2.1 |
KCS |
FX0 |
Wave pattern (MOERI) |
2.2a |
KCS |
FX0 |
Resistance (MOERI) |
2.2b |
KCS |
FRz θ |
Resistance, sinkage and trim (MOERI) |
2.3a |
KCS |
FX0 |
Self propulsion (thrust, torque, propulsive factors, mean velocity), local flow (NMRI) |
2.3b |
KCS |
FRz θ |
Self propulsion (thrust, torque, RPM), sinkage and trim (FORCE) |
2.4 |
KCS |
FRz θ |
(Surge), Pitch, heave, added resistance (FORCE) |
3.1a |
5415 |
FX&sigma &tau |
Mean velocity, resistance, wave pattern (INSEAN) |
3.1b |
5415 |
FX&sigma &tau |
Mean velocity, resistance, wave pattern, Reynolds stresses (IIHR) |
3.2 |
5415 |
FRz θ |
Resistance, sinkage and trim (INSEAN) |
3.5 |
5415 |
FX&sigma &tau |
Wave diffraction, Mean velocity (IIHR) |
3.6 |
5415 |
FRφ |
Roll decay (IIHR) |
Table 1. Summary of cases and computations
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.
Deadlines
First official announcement December 2008
Web site open 1 April 2009
Detailed specification of cases and computations on web site 1 April 2009
Second announcement 1 April 2009
Coordinate system(s) available 1 October 2009
Poster's format available 1 October 2009
Questionnaire available 1 October 2009
Postponement announced 27 January 2010
Format of simulation results on web site 1 March 2010
Existing experimental data on web site 1 March 2010
Verification and Validation instructions completed 1 March 2010
Registration open 1 July 2010
FTP site open for results 1 June 2010
Expression of interest submission closed 1 July 2010
Computed results uploaded on FTP site 1 September 2010
Questionnaire returned by participants 1 September 2010
Paper uploaded on FTP site 1 October 2010
Registration closed 26 October 2010
Results plotted and distributed to participants 1 December 2010
Workshop 8-10 December 2010
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 Professor Lars Larsson, Chalmers
University of Technology, email: lars.larsson@chalmers.se.