Dynamic Free-Surface Simulations Using CREATE-Ships MAKO

The recently released HPCMP CREATE™-SH MAKO (Marine-Aligned Kestrel Offshoot) CFD solver has been validated for a number of applications in both single-fluid and two-fluid physics. These validation exercises have been carried out in the context of single grid and dual mesh/overset grid topologies. The current thrust of development work is in adapting the solver to utilize prescribed Arbitrary Lagrangian-Eulerian (ALE) mesh motion for free-surface and dual mesh simulations. These advances to the solver will allow for the simulation of surface ships encountering waves and undergoing arbitrary maneuvers, with the overset grid solution strategy utilized to capture wave fields and wakes with improved accuracy (compared with single grid simulations). Newly developed ALE capabilities also make it possible to capture “slamming” events, which simulate the impact of a hull on the free-surface. Additional development efforts are focused on dynamic mesh motion and improved overset grid coupling. When coupled with recently the implemented ALE mesh motion, the dynamic/responding mesh motion solver will allow for 2 degree-of-freedom (2DOF) and eventually 6-DOF ship motion. This will allow for the simulation of a surface ship that is free to sink and trim and thereby converge dynamically to its own equilibrium orientation, as opposed to being fixed at a given sinkage and trim by the user. A great deal of experimental data exists for surface ship models that are free to sink and trim, so this capability will make it possible to attempt many additional validation cases. Finally, the overset grid coupling will improve the quality of the solution in the presence of an overset boundary. By synchronizing data at the PISO loop or even solver level, the more advanced coupling strategy will prevent decoupling of the solution across grids and improve accuracy of resistance predictions. Test cases will be used to perform verification and validation of these new capabilities.

PRESENTER

White, Paul (Presenting for Jemison, Matthew)
Jemison, Matthew
matthew.b.jemison.civ@us.navy.mil
850-322-4224

Naval Surface Warfare Center Carderock Division

CO-AUTHOR

Paul White
paul.f.white27.civ@us.navy.mil

Andrew DeJong
andrew.s.dejong.civ@us.navy.mil

Chandrasekhar Kannepalli
chandrasekhar.kannepalli.civ@us.navy.mil

Wesley Wilson
wesley.m.wilson.civ@us.navy.mil

Michael Mattson
michael.d.mattson3.civ@us.navy.mil

Jacob Engel
jacob.b.engel.civ@us.navy.mil

CATEGORY

Computational Fluid Dynamics

SYSTEMS USED

Narwhal, Warhawk, Gaffney, Koehr

SECRET

No