IMIS - Marine Onderzoeksgroepen

Time history of the resistance, divided into friction and pressure components and given separately for the rudder, hull, and complete ship. The first column should correspond to the physical time, the second column to the friction resistance, the third to the pressure resistance and the fourth to the total resistance. Separate files should be provided for the hull, rudder and complete ship. The files should be named as resistance_hull.dat, with “hull” being replaced by “rudder” or “ship” for the rudder and complete ship results.
- Time history of the vertical force of the ship, divided into friction and pressure components. The first column should correspond to the physical time, the second column to the friction component, the third to the pressure component and the fourth to the total vertical force. The file should be named as vertical_force.dat.
- Time history of the side-force (for half of the hull), divided into friction and pressure components. The first column should correspond to the physical time, the second column to the friction component, the third to the pressure component and the fourth to the total side force. The file should be named as side_force.dat.
- Mean wetted surface area of the ship;
- Time-averaged transverse wave cuts at different longitudinal positions: 𝑥=−0.25𝐿𝑝𝑝, −0.1 𝐿𝑝𝑝, 0, 0.25 𝐿𝑝𝑝, 0.5 𝐿𝑝𝑝, 0.75 𝐿𝑝𝑝, 1.0 𝐿𝑝𝑝. The wave cuts are to be provided as data files with two columns, where the first column is the lateral coordinate (y position) and the second column is the position in the z direction of the free surface. The files should be named wave_cut_LppYYY.dat where YYY corresponds to the longitudinal position of the cut. Example: wave_cut_Lppm0p25.dat for the file with the wave cut at −0.25 𝐿𝑝𝑝, and wave_cut_Lpp0.dat for the file with the wave cut at 0𝐿𝑝𝑝. Note that the decimal point in the position gets replaced by “p”, and negative values are preceded by “m”.
- ime-averaged 𝐶𝑓 and 𝐶𝑝 cuts at different planes: 𝑥= 0.1 𝐿𝑝𝑝,0.25 𝐿𝑝𝑝,0.5 𝐿𝑝𝑝,0.75 𝐿𝑝𝑝,0.9𝐿𝑝𝑝. One additional cut is requested along the centerline of the ship, along the keel. The files should contain three columns, the first consisting of the lateral position, the second of the vertical position, and the third of 𝐶𝑓 or 𝐶𝑝. The files should be named cf_cut_LppYYY.dat and cp_cut_LppYYY.dat for 𝐶𝑓 and 𝐶𝑝, respectively. For the cut at the centreline, LppYYY should be replaced by centre. E.g: cf_cut_centre.dat.
- Time-averaged velocity profile on the boundary-layer at the centreline of the ship and two longitudinal positions: 𝑥=0.49 𝐿𝑝𝑝 and 𝑥=0.62 𝐿𝑝𝑝, along with the shear-stress at the wall for the corresponding position. The profiles should contain the velocity in the x axis and the wall distance. The first line of each file should contain the shear-stress at the wall for the corresponding position. The remaining lines should contain the distance to the wall followed by the velocity in the x direction. The profiles should be provided in files named velocity_LppYYY.dat, where YYY is the corresponding position of the profile. Example: velocity_Lpp0p49.dat.
- Figures of the L2 norm (RMS) of the residuals at the end of each time step for each of the solved variables. The y axis of the plot should be in logarithmic scale, ranging from 1 to 10-8.
The name of all files should be preceded by PXX where XX is the participant’s identification number and followed by SetW_ZZZZ, where W corresponds to the Set to which the results belong to and ZZZZ is
- the grid designation for the corresponding grid, for Set 0. Example: P13_cf_cut_Lpp050_Set0_grid5.dat.
- the Froude number, for Set 1. Example: P08_wave_cut_Lpp0p75_Set1_0p219.dat. Note that the decimal point in the Froude numbers gets replaced by “p”.
- the scale ratio 𝜆, for Set 2. Example: P44_cp_cut_Lpp01_Set2_21p167.dat. Note that the decimal point in the scale ratio gets replaced by “p”.
In the event that participants submit data from more than one grid / model for each Set, another suffix should be added to the names in the form of _VAA, where AA should range from 01 to the number of different submissions, and inform the organisation of the differences between each submission.
In order to ensure consistency between the results, participants are asked to follow the following guidelines:
- All forces should be given for half of the ship;
- Force values for the resistance should be given as positive if they oppose the motion of the ship, and negative otherwise;
- The vertical force should be given as positive if it points upward, and as negative if it points downward;
- The side force should be given as positive if it points towards the centreline of the ship, and negative if it points outwards;
- The velocity along the x direction for the velocity profiles should be given according to the reference frame in which the ship is provided. This means that the velocity will be negative in the velocity profiles.
- All quantities should be given in SI units, when applicable, and no prefixes should be used. This means that forces should be reported in Newton [N] and not kilo Newton [kN], distances and positions in meters [m], time in seconds [s] and velocity in meter per second [m/s].