Recent Capability Updates in CREATE™-SH MAKO (Marine-Aligned Kestrel Offshoot)
The present work focuses on current and upcoming capabilities within the Department of Defense (DoD) High Performance Computing Modernization Program (HPCMP) CREATE™-SH MAKO (Marine-Aligned Kestrel Offshoot) Computational Fluid Dynamics (CFD) solver. This presentation provides an overview of several newly implemented approaches (of varying accuracy and computational expense) to simulate the performance of ship propellers. First, a capability is presented that enables simulation of a fully discrete rotating propeller using an Arbitrary Lagrangian Eulerian (ALE) formulation. Then, the problem is re-formulated in a rotating reference frame (RRF) to yield a comparable level of accuracy at a reduced cost. The final propeller modeling approach is a reduced-order method utilizing the Blade Element Momentum Theory (BEMT). An assessment is made on cost versus accuracy in prediction of thrust and torque coefficients.

The second portion of this presentation explores current development efforts within the MAKO CFD solver. An overview is given outlining improvements to the solver for prediction of dynamic freely responding rigid-body motion. The updated motion solver features stabilization of the rigid-body equations of motion intended to handle instabilities from the fluid added mass. The nature of these instabilities arises from acceleration of a dense, incompressible fluid by a comparatively lightweight body. The new motion solver is tested in the context of an in-depth case study to predict the dynamic response of a ship in an incident wave field. The subject of the study is the Korean Container Ship (KCS). Fourier components of the vessel response and the wave forcing are computed from the CFD predictions and are compared with experimental findings. Simulation of the KCS leverages recent developments that improve stability of the fluid solver in the presence of overset meshes though use of a strong coupling strategy in the overset region. To conclude, future development tasks are outlined. Topics touch on continued development of the dynamic rigid-body motion solver, improvements to overset mesh methods, and automated meshing techniques within MAKO.
IMPACT
Accomplishment: Improved capability in CREATE-Ships software application MAKO; Result: Ongoing development of CFD capability -- end state will enhance hydrodynamics analysis for U.S. Navy problems.
PRESENTER
White, Paul
paul.f.white27.civ@us.navy.mil
301-227-1535
Naval Surface Warfare Center - Carderock Division
CO-AUTHOR(S)
Jemison, Matthew
matthew.b.jemison.civ@us.navy.mil
Wilson, Wesley
wesley.m.wilson.civ@us.navy.mil
CATEGORY
Comp Fluid Dynamics
SYSTEM(S) USED
Carpenter, Narwhal