BRG_GEN hydrodynamic results - MOSES

Hello,

I'm trying to understand the reason of different results from a barge model, that has been defined in two alternative methods.

The barge is a simple box 300 ft long, 20 tall, 90 wide.

* The first model, named tow_brg.dat is defined with the pgen command. The case test_rao.cif perform the simulation.
* The second model, named tow_brg_gen.dat is defined with the brg_gen command. The case test_rao_gen.cif perform the simulation.

Apparently the two models are identical: the hydrostatic computations confirm that they are equivalent.

But the hydrodynamic results are totally different, for instance the added inertia (page 6 of the output report) for the model generated with the brg_gen macro is unrealistic.

Any suggestion is welcome

Doug

test_rao.zip