ITI Barge4 hydrodynamic coefficients

Wind & Water Structural Analysis
1

Dear all,

I was analizing the ITI Barge4 hydrodynamic coefficients (added mass and damping coefficients) calculated with WAMIT when I realize that there does not match these values with coefficients showed in ‘Dynamics Modeling and Loads Analysis of an Offshore Floating Wind Turbine’ in page 83. I suppose that there are undimensionalized. But, which is the undimensinalized value? Is it water density (1025 g/ml)?

Thanks in advance,
JOE

2

Dear JOE,

Actually, the hydrodynamic coefficients plotted on page 83 of the report you reference are fully dimensional (including water density, length scale, etc.).

Best regards,

3

Dear Jonkman,

Thank for your reply.

I agree on the hydrodynamic coefficients plotted on page 83 of the report I reference it that are fully dimensional. But I was refering to coefficients on the file (barge.1), because if I plot it has not the same value as referenced page plots.

These file (barge.1) coefficients are undimensionalize? And if they are, is the water density (1025g/ml) the correlative value?

Thank you in advance.

Sincerely,
JOE

4

Dear JOE,

Yes, the WAMIT output files (including the *.1 file) are nondimensional. See my post dated Jul 01, 2011 in the following forum post for more information: WAMIT - #4 by Jason.Jonkman.

Best regards,

5

Dear Jonkman,

Thank you so much for taking time for the reply.

Was that the answer that I was searching. I didn’t realize that you clarified the topic previusly in the forum, sorry.

Best regards,
JOE