CITEPH Project. Simulation of extreme waves impacts on a FLNG
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1 CITEPH Project Simulation of extreme waves impacts on a FLNG Pierre-Michel GUILCHER, Julien CANDELIER (HydrOcean) Ludovic BEGUIN, Guillaume DUCROZET, David Le TOUZE (Ecole Centrale Nantes)
2 Context of the study Strong wave impacts knowledge => structural design Hydrodynamics loads Inducedby waves Strongly nonlinear multiphysics ~ms, ~mm ~s, ~m Gas compressibility, hydroelasticity Page 2
3 Experimental setup Page 3 8th Spheric Workshop Trondheim
4 Experimental setup Experimental Wave Tank ECN 50x30x5 m Multiflap wave generator Simplified FNLG model 1.1m width Instrumentation Waveprobes in tank Waveprobes on deck Pressure probes on breakwater Water waves Regular waves Wavelength=7.3m Amplitude = 0.44m Page 4
5 Wave-Forcing procedure Page 5 8th Spheric Workshop Trondheim
6 Forcing procedure Main algorithm Complete problem through direct simulation Wave generation Wave propagation from generator to structure Impacts High cpu time consuming Numerical methods not adapted Wave generation/propagation Spectral methods No dissipation No structure Lowcputime Computed once before SPH computation + Impact SPH method Inlet/outlet wave boundaries = Page 6
7 Forcing procedure Incident wave models: potential spectral methods Rienecker & Fenton Monochromatic regular waves Bidimensional Fully nonlinear HOS (Higher Order Spectral) Irregular waves Multidimensional Fully nonlinear Applications: focused waves, states, etc. irregular sea Page 7
8 Forcing procedure Incident wave solution File storage HOS solution computed once File storage of a set of cartesian grids covering the impact area, at various instants Bilinear interpolation in space V, p at particle position Cartesian grid at time t Linear interpolation in time Page 8 8th Spheric Workshop Trondheim (Norway), June 4-6, 2013
9 Forcing procedure SPH-flow solver Developed by ECN and HydrOcean Improved SPH solvers Riemann solvers for stability Renormalization for accuracy High Parallel efficiency domain decomposition (MPI comm.) Efficient scalability (linear scalability up to cores / 1 billion particles) Variable-h capability 3D complex geometries/domains Page 9
10 Forcing procedure Imposition of incident field Free standard particles Standard SPH scheme Standard flux interactions with dummy particles Dummy particles in the inlet/outlet area Pressure, velocity from potential solution Position updated with incident velocity Incident waves No remeshing Enoughparticlesatstarttime in the buffer zone isrequired Vitalization/unvitalization of particles through inlet/outlet boundary Page 10
11 Numerical simulation of Greenwater event Free surface elevation Reproduction of HOS signal along the ship in the undisturbed area No phase shifting of SPH/reference HOS Small damping Page 11
12 Numerical Simulation of a Greenwater event Page 12
13 Numerical simulation of Greenwater event Numerical Set-up dx = 0.01 m ~ 250 neighbours L/dx 100 (L = deckwidth) λ/dx 750 (λ = wavelength) ~ 1.5 millions particles h-variable discretisation Use of 512 cores wave probes colored according to h Page 13
14 Numerical simulation of Greenwater event Qualitative description Incident wave exceeding freeboard Impact of the plunging jet, Flooding of lateral flows Page 14
15 Numerical simulation of Greenwater event Qualitative description Converging flow impacts the wall Flow is deviated vertically Page 15
16 Numerical simulation of Greenwater event Qualitative description Collapse of the water column Water escape Page 16
17 Numerical simulation of Greenwater event Water elevation on deck reverse flow The floodingof water iscaptured Impact time occurrences well captured Good estimation of water elevation near the ship fore Progressive damping of the water elevation on deck Initial conditions for wall impact not met Page 17
18 Numerical simulation of Greenwater event Pressure probes on breakwater experimental M1 SPH dx=1cm M1 SPH dx=2.5cm M pressure (Pa) M1 Dam break on an obstacle time (s) -Good synchronisation -Impact pressures not captured -Need of higher refinement M M4 Page
19 Industrialapplication Page 19
20 Industrial application Selection of greenwater event Irregular sea state statistically described as (Hs, Tp) How to determinemostsevere conditions? Not possible withcfd Use of old linear potential solvers Page 20
21 Industrial application Selection of greenwater event HOS/SPH-flow Linear seakeeping solver Page 21
22 Industrial application Selection of greenwater event Page 22
23 Conclusions and perspectives Page 23
24 Conclusions wave-structure interactions simulation forcing procedure between non-linear potential flows and SPH is effective uses the advantages of each solver, without drawbacks for simulations with no diffracted field at open boundaries Numerical simulation of greenwater events: propagation phase: no phase shifting, small damping Qualitative behaviour of deck flooding is captured Kinematics OK, dynamics (pressure) not => Need of higher refinement => local refinement Still a very demanding problem in terms of CPU Page 24
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