The current acceleration calculation method in moordyn

[windseacn]

Thank you to the development team for providing this code. I am interested in the current implementation and would like to understand how the velocity acceleration is calculated in Moordyn. From the source code, I found the following code snippet:

// TODO: approximate fluid accelerations using finite
//       differences
currentGrid->CurrentAcc()[ix][iy][iz][it] = vec3::Zero();

It appears that, at present, the current acceleration is consistently set to zero. Is this correct?

Additionally, I have a related question: Are there any papers that discuss the theoretical formulation regarding wave and current implementation? I could not find any such papers in the references section of the online manual.

[RyanDavies19]

Hi @windseacn,

I believe so, but @sanguinariojoe may know best on current acceleration specifically. The water kinematics options are laid out in the docs here: https://moordyn.readthedocs.io/en/latest/waterkinematics.html#water-kinematics-in-moordyn

Water kinematics can differ based on the methods being used. In general though @ewoudVL13 did a pretty good job of explaining the theory in chapter 3 of their thesis, linked in #330