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DFBI Superposed Rotation - Ship self propulsion

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Old   March 19, 2018, 17:57
Default DFBI Superposed Rotation - Ship self propulsion
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Andreas Giannoulis
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Hi everyone,

I am trying to simulate a ship in self propulsion using DFBI Superposed Rotation. I started the simulation with a big time step(0.05s) to let the resistance converge and then I decreased the time step (0.0005s) to let solve the motions of the propeller. When I changed the time step the simulation huge osculations appeared in the signal. Am I doing something wrong? Also the sign of thrust change so negative to positive.
Im attaching some pictures so you can have a look.

Thanks in advance.
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