Added mass & damping coefficient

[Paolo83]

Hello!

I am studying the Strip-theory to derive the motion of a ship under the waves.
The aim would be to determine the RAO's functions.

I wanted to know if anyone knows tell me a method to determine the added mass matrix and damping matrix for a simple geometry, such as a cylinder.

thanks!

[Ad Hoc]

If memory serves, the added mass of cylinder is:
rho x pi x rad^2

Just check out anyt good fluid dynamics text book, such as "Fluid Dynamic Drag" by SF Hoerner

[jehardiman]

Theory of Seakeeping by Korvin-Kroukovsky and published by SNAME has the complete deveration of the matrix and the Lewis factors for surface ships. PNA also has a compressed version of ToS in Vol III.

[daiquiri]

Originally Posted by jehardiman

Theory of Seakeeping by Korvin-Kroukovsky and published by SNAME has the complete deveration of the matrix and the Lewis factors for surface ships.

Thank you JM. I've found the on-line version of the book here: http://openlibrary.org/books/OL58231..._of_seakeeping
and it can also be downloaded as pdf file: http://www.archive.org/download/theo...eepi00korv.pdf

Cheers

[marknav]

Besides previous posts, I know that Vougts made experiments to calculate the added masses for simple geometries and there are books about it. As idea try also to applicate the Morrison theory (approx empirical) for cylinder in a alternate flux, look for it, it might be interesting..

[Leo Lazauskas]

Another reasonable on-line reference is:
http://ocw.mit.edu/courses/mechanica...05reading6.pdf
by Prof. Alexandra H. Techet at MIT.

Good luck!
Leo.

[Paolo83]

Originally Posted by jehardiman

Theory of Seakeeping by Korvin-Kroukovsky and published by SNAME has the complete deveration of the matrix and the Lewis factors for surface ships. PNA also has a compressed version of ToS in Vol III.

Thanks!
I'll watch it sure!