The Numerical Wave Tank (NWT) group of the International Society of Offshore and Polar Engineers was established at the 5th ISOPE conference in The Hague (1995). This grope is open freely to everybody interested in this topic.
At the 7th conference in Honolulu (1997), it was decided by the member of the group to begin series of informal workshop meeting where computational benchmark cases are defined and their results discussed and commented in a special session during the forthcoming ISOPE conference. A free access data banks are created and enriched with the numerical results of the participants; these data banks are accessible freely and permanently in an web and ftp site via Internet. Then everybody will be able to get data files and to perform his own analysis and comparison with any other participant. The files contain not only numerical results, but also a short text section where the numerical technique is summarized and related bibliographic references are given.
The first special NWT Workshop session was held in ISOPE98 Montreal Conference and the second NWT Workshop session was held in ISOPE99 Brest Conference. The second benchmark results were presented by the NWT grope leader (currently Katsuji Tanizawa) at the NWT workshop, then openly discussed by all the present participants (contributing or not). (Minutes is here.)
In this web pages, the presented results at the second NWT Workshop session are summarized. You can also access our data bank in this web site.
Wave radiation by sinusoidal heave motion of a wedge
Description of benchmark test
w^{2} a / g 






T / (a/g)^{0.5} 






l / a 






For the detail of the 2nd benchmark test, please refer the announcement of 2nd NWT Workshop.
Contributor
Simulation Method
Symbol
BEM Fully Nonlinear
BEMA
BEM Fully Nonlinear
BEMB
BEM Fully Nonlinear
BEMC
BEM Fully Nonlinear
BEMD
BEM 2nd order
BEME
FEM Fully Nonlinear
FEM
FVM Fully Nonlinear
FVM
BEMB
FVM
w^{2} a / g
0.2 0.4 0.6 0.8 1.0 1.2 A / a = 0.2
Case 1 Case10 Case 2 Case11 Case 3 Case12 A / a = 0.4
Case 4 Case13 Case 5 Case14 Case 6 Case15 A / a = 0.6
Case 7 Case16 Case 8 Case17 Case 9 Case18
Added mass
A / a
0.2 0.4 0.6 Damping coefficient
A / a
0.2 0.4 0.6 Second order hydrodynamic force
A / a
0.2 0.4 0.6 Second order hydrodynamic force (Constant component)
A / a
0.2 0.4 0.6 Third order hydrodynamic force
A / a
0.2 0.4 0.6
Zip files
1578MB
84KB
864KB
1168KB
4759KB
1749MB
296KB
StuffIt files
1635KB
92KB
892KB
1207KB
4973KB
1795KB
308KB
( Data format of these files are prescribed in the announcement of 2nd NWT Workshop. )
Data files of the 1st NWT Workshop are available at the ftp site.
ftp://ftp.ecnantes.fr/NWT/1998/
Wave diffraction problem with wave maker & absorberDown load the announcement of 3rd NWT Workshop.
benchmark2000.ps (PS file)
benchmark2000.pdf (PDF file)
benchmark2000.doc (Word file)