The
next module in the work flow after UliLines is UliTank. Based on a
regression analysis of towing tank results UliTank estimates the
resistance of the hull of a sailing yacht for a given speed.
The
computing of the complete resistance curve takes only a few seconds on
any computer. Therefore UliTank is much better suited for the
optimization of the hull form than expensive CFD-Programs. For
comparison: In the Wide-Light-Project the CFD-Program OpenFoam requires
21 hours computing time
on a CPU with 64 cores for a single speed-point. In
the version UliTank_3.3 the resistance can be computed for a
bare or appended
hull, heeled or upright, with or without sideforce or leeway. The table
of offsets that is
required as
input to UliTank can come from any CAD-system, the origin of the
lines-plan is
not restricted to UliLines. Several different input formats are allowed.The program can be
downloaded free of charge. The theoretical background is described in
this report.

Details of the program are explained in the user's manual that can be downloaded here:

UliTank User's manual:

A good place for questions and discussions is this Forum.