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Instructions to participants:
Test Cases and Format of
Simulation Results, System-based methods
Test Cases and
Format of Simulation Results, CFD-based methods
It is possible to
participate in the workshop by performing:
A) model tests
with one of the hulls
using a system-based method, or
using a CFD-based method
groups should follow the instructions given in the section below defining the
content and format of the submitted data. Groups performing simulations are
required to fill out a questionnaire to document the used method. At the
workshop the participants are expected to present a poster documenting their
method and a paper that will be published in the workshop proceedings.
1. Test Procedures
The model tests should generally be carried out according to the
Recommended Procedures given by the 23rd ITTC Manoeuvring Committee, i.e.:
2. Simulation Procedures
With respect to the manoeuvring simulation methods, whether based on
experimental or numerical data, it is recommended that they are validated
based on the following ITTC Recommended Procedure:
Manoeuvring Simulation Models”, No. 7.5-02-06-03, 2002.
3. Uncertainty Assessment
Uncertainty assessment (i.e.
verification) is required for all participants, both for the experimental
methods and for the numerical methods.
With respect to the numerical
methods it is recommended that the procedures proposed by the 22nd ITTC
Resistance Committee be used, however, estimates from alternate methods,
including extrapolation of uncertainty estimates from benchmark
applications, are acceptable. The 22nd ITTC adopted the procedures on an
interim basis and included them in the following sections of the Quality
QM Section 4.9-04-01-01, "Uncertainty Assessment in CFD
Methodology," Download PDF file [125KB]
QM Section 4.9-04-01-02, "Guidelines for RANS Codes,"
Download PDF file [26KB]
QM Section 4.9-04-02-01, "Examples for Resistance and Flow,"
Download PDF file [1135KB]
Note that the procedures and methodology are based upon those presented in
Stern et al. (1999).
With respect to the captive tests
(mainly PMM) it is recommended to follow the procedure described in
Simonsen, C. D., 2004.
4. Format of Model Test Results
A full set
of results corresponding to the relevant test program described on this
site must be supplied.
must be sent as soon as possible after termination of the tests.
should be packed in a single zip-file.
be in ASCII-format.
All data in
All data in
tests mean values should be given, while for dynamic tests incl. free
model tests full time series as well as Fourier coefficients must be
captive tests the following parameters should be included:
Time, total forces (X, Y, N), position (x, y, psi), velocities (u, v,
r), accelerations (udot, vdot, rdot).
For static tests mean values should be given. For dynamic
tests data should be delivered in the form of time series of
hydrodynamic forces for one complete PMM cycle after
filtering and averaging over the measurement period.
tests the following parameters should be included:
Time, position (x, y, psi), velocities (u, v ,r), roll angle, rudder
angle, propeller revolutions, propeller thrust/torque (optional), rudder
forces/moment (optional). A full time series of each channel must be
separate file shall describe the model and the test conditions including:
model moment of inertia izz
deviations in model geometry from the data given on this site
deviations in test conditions from the data given on this site
applied method of turbulence stimulation
applied method of frictional force correction
applied strategy for adjustment of propeller revolutions
5. Format of Simulation results,
Format of Simulation results, CFD-based methods
Questionnaire, CFD-based methods
9. Format of Posters
Posters should be submitted in pdf-format on the
The printed size will be 70 x 100 cm. Additional guidelines can be found
here. An example of a poster layout is given
10. Format of Papers
Papers should be submitted in pdf-format on the
FTP-server. A template in Microsoft Word which
describes the format is given
11. Coordinate system
The coordinate system and sign convention to be used
throughout the workshop is the one normally used for manoeuvring as
described in ITTC "Symbols and Terminology List", Version 2002, i.e. a
right-handed, horizontal, body-fixed coordinate system with x positive
forward of midships, y positive starboard of centre line and z positive down
12. FTP server
Model test data can be downloaded from the FORCE Technology FTP-server (ftp.force.dk).
The captive model test data for input to the simulation methods is stored in
the folder 'simman2008-open', separately from the free model test data in
'simman2008-blind', which will be kept blind until the workshop.
Note: after the workshop all the free model test data has been moved to the
Simulation results as well as papers and posters should be submitted by
uploading the files in the prescribed format to the FTP-server under
The structure of the folders can be seen
Login to the FTP server:
To obtain a username and a password, please send an e-mail to:
1. Open an Internet Explorer.
2. Go to ftp://ftp.force.dk/pub/.
3. Select ‘File’/’Login as…’ and enter username and password.
4. Go to the folder ‘simman2008-open’/‘simman2008-submit’ and find the
5. Up/download files by using ‘copy’/’paste’ commands.