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Output of Sensor in sub structure

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Hi,

the most effective method to determine the reaction force between the jacket and the ground is to extract the reaction forces directly from the ground constraints specified using the CST_X keyword.

See here: https://docs.qblade.org/src/user/turbine/substructure.html#defining-sensors-locations

Check in the substructure constraint table which constraints fix the jacket structure to the ground and then assign sensors to those constraints. The reaction forces are then given in the global coordinate system (for constraints connected to the fixed ground).

BR,

David

mnaeem has reacted to this post.
mnaeem

Hi,

The issue that I am facing is that the hydrodynamic load from Q-blade for a jacket is very different compared to the hydrodynamic load from SACS or hand calculation. Do you know if the hydrodynamic load calculation has been verified for fixed structures?

I have attached the file, I am doing an analysis with just hydroloads.

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Hello,

the hydrodynamic load models in QBlade, including those based on Morison’s equation and Potential Flow, have undergone extensive verification through both experimental and numerical data. Although most validation efforts have focused on floating structures, we also tested on fixed structures (currently ongoing in OC7) and the results should generally be transferrable.

Of course, the accuracy of hydrodynamic load calculations depends significantly on the distributed Morison coefficients or the quality of the potential flow data.

Any discrepancies you’re experiencing might be due to setup issues, but it’s difficult to ascertain this from just a project file. Could you provide your reference data and explain how it compares to the results from QBlade? Specifically, it would be interesting to know the measured quantities and the positions at which they were recorded. Including plots in your response would also be helpful to identify issues.

BR,

David

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