Bring fixes for omdao wrapper into official release #40
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- Included mean drift. Current implementation is not rigorously correct when more than one wave direction are acting at the same time, but should be good enough for now. - The QTF files pre-computed with a BEM code are in a different resolution then the incoming waves in RAFT. To solve that, we were computing the second-order force spectrum considering the QTF resolution and then interpolating the result. Turns out that we obtain different results if we interpolate the QTF first. Left both implementations in the code, but still thinking whether it is worth adding a flag for that on the input file. - Typo fix
- Added helper functions to compute quantities needed for the slender-body approximation for second-order wave loads - Added the capability of computing QTFs using the slender-body approximation - Included flags in the input file for the second-order loads - Updated solveDynamics for the case where the second-order loads are computed with the slender-body approximation. In that case, we need to first solve for the first-order motions to compute the second-order forces and moments.
- Added force due to the rotation term from slender-body approach - Added force due to body motions inside the wave field - Bug fix: The force component due to the relative wave elevation was being computed for one member only; - Bug fix: There was a cos instead of a sin in the computation of gradient matrix of fluid velocity induced by waves. This influenced the axial-divergence acceleration and the component due to body displacements; - Bug fix: The 2D qtf interpolation in calcHydroForce_2ndOrd was interpolating only the real part of the matrix - Commented a part of raft_member.py that breaks the computation of second-order loads. Still need to figure out why
Also changed test cases for the OC3 Hywind
Made it run for a single turbine case, but need to test it with an array. Besides, had to change some stuff in the code from ctopt and comment other stuff that I don't know how to fix right now.
- Damping levels were heavily underpredicted when motions induced by second-order loads are large. It much improved after including these motions in the drag linearization procedure. - There was a bug in the calculation of the second-order force amplitude from the spectrum, namely a factor of 2 that was outside a sqrt but should be inside it.
- Fix F_lines0 size - Compute natural periods with RAFT - Handle multi-rotor outputs
Second-order wave loads in RAFT
Update openmdao interface for WEIS
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Purpose
Thanks to @dzalkind, the primary objective is to have a working OpenMDAO wrapper in the
masterbranch as that is needed for WEIS packaging. This also installs some tests to insure that the capability doesn't get lost again in the future.There are other 2nd order hydrodynamics changes that are coming along for the ride too.
Type of change
Testing