|
Test Procedures
The model tests should generally be carried out according to the Recommended Procedures given by the 23rd ITTC Manoeuvring Committee, i.e.:
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:
“Validation of Manoeuvring Simulation Models”, No. 7.5-02-06-03, 2002.
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 Manual:
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.
Format of
Model Test Results
-
A
full set of results corresponding to the relevant test program
described on this site must be supplied.
-
The
results must be sent as soon as possible after termination of the
tests.
-
All
files should be packed in a single zip-file.
-
Files
should be in ASCII-format.
-
All
data in model scale.
-
All
data in SI-units.
-
For
static tests mean values should be given, while for dynamic tests
incl. free model tests full time series as well as Fourier
coefficients must be supplied.
-
For 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.
-
For free 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 supplied.
-
A separate file
shall describe the model and the test conditions including:
-
model
scale
-
model
weight
-
model
moment of inertia izz
-
any
deviations in model geometry from the data given on this site
-
any
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
-
water
temperature
-
logging
frequency
Format of Simulation results,
System-based methods
Not available yet
Questionnaire, System-based
methods
Not available yet
Test cases for CFD-based methods
Participants performing CFD-based simulation of PMM motions should use
the following test cases, which can be directly compared to PMM test
results.
| |
KVLCC1+2 |
KCS |
5415 |
| speed, FN |
0.142 |
0.26 |
0.28 |
| static drift,
b |
4 deg |
4 deg |
4 deg |
| pure sway, v' |
0.08 |
0.08 |
0.07 |
| pure yaw, r' |
0.4 |
0.4 |
0.3 (*) |
| yaw & drift, r' /
b |
0.4 / 4 deg |
0.4 / 4 deg |
0.3 / 8 deg (*) |
(*) NB. at 0.60U0 i.e. Fn = 0.168
Format of Simulation results, CFD-based methods
Not available yet
Questionnaire, CFD-based methods
Not available yet
Format of Posters
Not available yet
Format of Papers
Not available yet
FTP server
Test data is stored and can be downloaded from the FORCE ftp-server.
Data from each test series is stored in a separate folder with a
corresponding password. User names and passwords to relevant folders are
obtained by sending an e-mail to:
technical@simman2008.dk
The structure of the folder is as follows:
simman2008
kvlcc1
pmm_app_moeri
1
pmm_app_insean
2
cmt_app_mnri
3
free_hsva
4
kvlcc2
pmm_app_moeri
5
pmm_app_insean
6
pmm_bare_shallow_insean 7
cmt_app_nmri
8
free_hsva
9
kcs
pmm_app_nmri
10
pmm_app_cehipar
11
pmm_app_shallow_bshc 12
cmt_app_nmri
13
free_sva
14
5415
pmm_app_force
15
pmm_bare_force
16
pmm_bare_iihr
17
pmm_bare_insean
18
cmt_bare_bec
19
free_marin
20
|