Simulating IEC DLC 1.6

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Simulating IEC DLC 1.6

Postby Manuela.Boehm » Tue Nov 13, 2018 8:23 am

Dear all,

I'm running extreme load analysis with FAST for jacket substructures. While looking further into the selection of simulation parameters I came across this clause in IEC 61400-3: “Calculation of DLC 1.6b may be omitted if in the treatment of DLC 1.6a, the non-linear wave kinematics are properly represented in the dynamic simulations of the severe stochastic sea state”

Are the here mentioned non-linear wave kinematics sufficiently covered by enabling the second-order waves?
How do you deal with load case 1.6a and 1.6b?

Many thanks in advance and kind regards,

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Re: Simulating IEC DLC 1.6

Postby Jason.Jonkman » Tue Nov 13, 2018 9:07 am

Dear Manuela,

The answer probably depends on the water depth, wave length, and wave height (wave steepness). Often wave kinematics are simulated in load case 1.6a with a constrained wave simulation (which is not functionality available in the current version of FAST/HydroDyn). See Appendices C and D for more information.

Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)

National Renewable Energy Laboratory (NREL)
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