3D domain decomposition for violent wave-ship interactions

• Published in: International journal for numerical methods in engineering Vol. 95; no. 8; pp. 661 - 684
• Main Authors: Greco, M., Colicchio, G., Lugni, C., Faltinsen, O.M.
• Format: Journal Article
• Language: English
• Published: Chichester Blackwell Publishing Ltd 24.08.2013; Wiley; Wiley Subscription Services, Inc
• Subjects: 3D domain decomposition; Applied fluid mechanics; Applied sciences; Curvature; Evolution; Exact sciences and technology; Fluid dynamics; Fundamental areas of phenomenology (including applications); Ground, air and sea transportation, marine construction; hybrid technique; Hydrodynamics, hydraulics, hydrostatics; level set; linear potential theory; Marine and water way transportation and traffic; Marine construction; Mathematics; Methods of scientific computing (including symbolic computation, algebraic computation); Navier-Stokes equations; Navier-Stokes solver; Nonlinearity; Numerical analysis. Scientific computation; Physics; Sciences and techniques of general use; Slamming; Solvers; Strategy; Three dimensional; violent wave-body interactions; weak/strong coupling; Visualization; Image processing; Navier―Stokes solver; Contour line; Wave interaction; Free surface; Boundary condition; 3D domain decomposition; Modeling; Fragmentation; Projection method; Linear flow; Navier Stokes equation; Hybrid model; Regularity; Sea surface wave; hybrid technique; Floating body; Sea navigation; Lagrangian; Wave effect; linear potential theory; Experimental study; Potential flow; Wavefront; weak/strong coupling; Cube; level set; Linear theory; Nonlinearity; Ship hull; Ship; Non linear effect; violent wave-body interactions; Curvature; Domain decomposition; Flow potential
• ISSN: 0029-5981; 1097-0207
• DOI: 10.1002/nme.4523

SUMMARYA 3D Domain‐Decomposition (DD) strategy has been developed to deal with violent wave‐ship interactions involving water‐on‐deck and slamming occurrence. It couples a linear potential flow seakeeping solver with a Navier–Stokes method. The latter is applied in an inner domain where slamming, water‐on‐deck, and free surface fragmentation may occur, involving important flow nonlinearities. The field solver combines an approximated projection method with a level set technique for the free surface evolution. A hybrid strategy, combining the Eulerian level set concept to Lagrangian markers, is used to enforce more accurately the body boundary condition in case of high local curvatures. Main features of the weak and the strong coupling algorithms are described with special focus on the boundary conditions for the inner solver. Two ways of estimating the nonlinear loads by the Navier–Stokes method are investigated, on the basis of an extrapolation technique and an interpolation marching cubes algorithm, respectively. The DD is applied for the case of a freely floating patrol ship in head sea regular waves and compared against water‐on‐deck experiments in terms of flow evolution, body motions, and pressure on the hull. Improvement of the solver efficiency and accuracy is suggested. Copyright © 2013 John Wiley & Sons, Ltd.