Feb 21, 2010 - 5. Sloshing experiments. Ship: Castillo de Villalba. 138000 m3 ship LNG. PROFIT Project Struct-LNG, with CIMNE,. Navantia 2001-2005.
CURRENT SLOSHING RESEARCH BASED ON THE SPH METHOD
2nd AIRBUS Propellant Sloshing Symposium. Jose Luis Cercós, Leo González (UPM) Salvatore Marrone and Andrea Colagrossi (INSEAN) David Le Touzé (ECOLE CENTRAL NANTES) 2 -3 November 2016, Bristol (UK)
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Current state of 3 Representative groups
Model Basin Research Group (CEHINAV). Naval Architecture Department (ETSIN). Technical University of Madrid (UPM).
CNR-INSEAN (Rome)Italy
Ecole Central de Nantes (France)
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Sloshing problem Highly non-linear problem. Problem tackled from an experimental and computational (SPH) point of view. Confined flow problem. High pressure impacts. Air bubble entrapement. Several industrial applications: 3 transport industry.
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Facilities Sloshing lab Tank testing device
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Sloshing experiments Ship: Castillo de Villalba 138000 m3 ship LNG. PROFIT Project Struct-LNG, with CIMNE, Navantia 2001-2005.
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Sloshing experiments Measurements: -Angular momentum -Pressure Impact -Fluid Structure Interaction (FSI) -Coupled problems.
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Sloshing experiments Current activity:
Deterministic study of the first pressure impact: Uncertainty y bidimensionality
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Fluid Structure Interaction L=114.8, H=114.8
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Sloshing experiments Future work:
Vacuum tests, Scale studies, Statistical analysis. Fluid-Structure Interaction, PIV, Irregular excitations, Several degrees of freedom, 2D/3D, etc. 9
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CFD: Sloshing (house made codes SPH)
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Sloshing Flows Project (2003-2007) Funded by: Centre for Ships and Ocean Structures (Trondheim, Norway) Objective: Perform an extensive SPH validation through a dedicate experimental campaign using prismatic tank force to move horizontally with simple sinusoidal time laws. The focus is on the periodic behavior observed after the end of the transient. More than 100 experimental runs, about 1000 SPH simulations. Adopted solver: 2D In-house SPH code developed at INSEAN.
B. Bouscasse et al., “Numerical and Experimental Investigation of Nonlinear Shallow Water Sloshing”, Int. J. Nonlinear Sci. Numer. Simul., 14, Issue 2, Pages 123–138, April (2013). 21/02/2010
The SinSEOn project (2016): Sloshing SPH Environment for long-time Oscillation simulation Funded by Hyundai-Heavy-Industries Objective: Perform sloshing simulations characterized by 3-hours real time duration with realistic severe sea-state forcing Adopted solver: Parallel 3D SPH code “SPH-Flow”, INSEAN is part of a co-development consortium for the SPH-Flow code
Long-time 3D Simulations Violent Sloshing flows with critical water impact events
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ENSiS (ENhanced SPH Schemes for complex free-surface flows) (2015) Funded by: Ecole Centrale Nantes Objective: The research activity aims at over coming some well-known limits of the SPH models in order to enlarge its range of application. The extension of enhanced SPH variants have been investigated with particular attention to the possibilities of coupling with Finite Volume solvers.
Adopted solver: 2D In-house SPH code developed at INSEAN for the initial development. The algorithm has been then implemented in SPH-Flow software.
Mechanical energy dissipation induced by sloshing flows (2013-2014) Funded by INSEAN and UPM Objective: Study a dynamical system involving a driven pendulum filled with liquid. The study of such a system is conducted in order to understand energy dissipation resulting from the shallow water sloshing and induced wave breaking.
Adopted solver: 2D In-house SPH code developed at INSEAN.
Energy Dissipated by the fluid
Roll Angle
Experiments with water confirms SPH simulations !!!
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3D experimental activities In collaboration with Bureau Veritas • 6-DOF hexapode • Pressure recording/visual measurements • 6-DOF motions of the LNG tanker ship (roll, heave, etc.) on regular and irregular seas calculated through HydroStar BV software => continuously imposed to the tank by hexapode • Used to validate global CFD solutions in the tank
Moiraud et al., ISOPE conf., 2010
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Numerical study of local effects In collaboration with GTT
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• Study of mechanics of local impacts • 2D simulations compared to experiments
Evolution w/ entrapment of an air pocket Pressure evolution at the 27 probes on the vertical wall
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Numerical study of local effects Intermediate gas pocket
Example of numerical results 2D multi-phase SPH simulations of the problem (wave form initiated from a Lagrangian single-phase potential flow simulation)
water+ gas mech. energy Total energy gas internal energy
Energy evolution
Evolution w/ entrapment of an air pocket Pressure evolution along the wall (y=vertical)
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Numerical study of local effects Fluid-Structure simulation when the wall is an LNG membrane • Complex LNG membrane structure accounted for • Strongly-coupled SPH fluid-structure model • Lower pressures are observed (energy is transferred to the membrane), especially for the sharp impact peak Rigid wall
Deformable membrane
Pressure evolution along the wall (y=vertical)
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Thanks for your attention.
