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How to set the appropriate value of hydro stiffness

#1 · 5. June 2023, 06:44

Hello

Now, I try to make a spar of floating VAWT model.
When we make a spar in QBlade, we should have to set the value of hydro stiffness.
However, I couldn’t understand how to calculate the value of it although I read QBlade documentation.
Could you give me your advice on how to determine the value of hydro stiffness.

Koma

#2 · 5. June 2023, 12:30

Hi Koma,

you dont necessarily need to model the hydrodynamic restoring force/moment with the “linear hydrodynamic stiffness” approach but you could use the “explicit buoyancy” option. A linear hydrodynamic stiffnes matrix is commonly obtained from a linear potential flow solver such as WAMIT, NEMOH or ANSYS AQWA.

See the following section in the docs for an overview of the different modeling options for a substructure in QBlade:

https://docs.qblade.org/src/user/turbine/substructure.html#modeling-options-for-an-offshore-substructure

BR,

David

#3 · 7. June 2023, 08:43

Thank you, David. Your explanation really helped. Now I understand about the setting of the hydrodynamic restoring force/moment better.

Best Regards,
Koma