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Item type:Publication, Access status: with files , Monolithic 3D numerical modeling of granular cargo movement on bulk carriers in wavesA novel monolithic approach for simulating vessels in waves with granular cargo is presented using a Finite Volume framework. The integrated approach aims to develop a tool for maritime safety analysis and design optimization of bulk carriers. The computational model integrates a three-phase Volume of Fluid method to represent air, water, and cargo, coupled with a material model that applies a rigid-perfectly plastic material model for the granular phase. The approach takes into account the floating motion of the ship using a rigid body motion solver for three degrees of freedom and is supplemented by inviscid far-field boundary conditions facilitating the generation of linear waves approaching the vessel. The model's efficacy is demonstrated through a validation of the three-phase Volume of the Fluid method, a verification of the granular material model, and finally, a reconstruction of the accident of the “Jian Fu Star” bulk carrier in a fully 3D simulation.Publicationtype: Journal Article25 35 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Numerical modeling of granular bulk cargoTo study the behavior of unsaturated granular materials on vessels, a monolithic multi-physics approach is implemented within a Finite Volume framework. This includes constitutive models representing various cargo failure mechanisms which are applied to 2D parameter studies that provide comprehensive insights into cargo behavior under diverse conditions. The models include a rigid-perfectly plastic soil model, a porous media approach for rigid materials, an incompressible elastic model, and a coupling of the rigid-perfectly plastic model with the porous media. Thorough validation and verification of all implemented models are presented, along with a proof-of-concept study demonstrating a complete three-dimensional simulation of a loaded bulk carrier in waves.Publicationtype: Doctoral Thesis53 57 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , A two-phase volume of fluid approach to model rigid-perfectly plastic granular materialsGranular flow problems characterized by large deformations are widespread in various applications, including coastal and geotechnical engineering. The paper deals with the application of a rigid-perfectly plastic two-phase model extended by the Drucker–Prager yield criterion to simulate granular media with a finite volume flow solver (FV). The model refers to the combination of a Bingham fluid and an Eulerian strain measure to assess the failure region of granular dam slides. A monolithic volume-of-fluid (VoF) method is used to distinguish between the air and granular phases, both governed by the incompressible Navier–Stokes equations. The numerical framework enables modeling of large displacements and arbitrary shapes for large-scale applications. The displayed validation and verification focuses on the rigid-perfectly plastic material model for noncohesive and cohesive materials with varying angles of repose. Results indicate a good agreement of the predicted soil surface and strain results with experimental and numerical data.Publicationtype: Journal Article20 43 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Assessment of simplified momentum equations for free surface flows through rigid porous mediaIn many applications, free surface flow through rigid porous media has to be modeled. Examples refer to coastal engineering applications as well as geotechnical or biomedical applications. Albeit the frequent applications, slight inconsistencies in the formulation of the governing equations can be found in the literature. The main goal of this paper is to identify these differences and provide a quantitative assessment of different approaches. Following a review of the different formulations, simulation results obtained from three alternative formulations are compared with experimental and numerical data. Results obtained by 2D and 3D test cases indicate that the predictive differences returned by the different formulations remain small for most applications, in particular for small porous Reynolds number ReP < 5000. Thus it seems justified to select a simplified formulation that supports an efficient algorithm and coding structure in a computational fluid dynamics environment. An estimated accuracy depending on the porous Reynolds number or the mean grain diameter is given for the simplified formulation.Publicationtype: Journal ArticleScopus© Citations 1 99 94 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Numerical modelling of granular cargo on bulk carriers in seaway(2015-05); This paper outlines the development of a numerical model for granular cargo on bulk carriers. In order to study the vessel behaviour including the motion of the load, a monolithic approach is chosen to model the fully coupled problem. The formulation of the granular material therefore has to be fully Eulerian. A nonlinear elastic solid phase is implemented in the Finite Volume solver FreSCo+ following the approach of Richter et. al [19] and Sugyiama et. al [22]. The method is then verified with the help of different Fluid-Structure interaction test cases.Publicationtype: Conference Paper49