Antonio Souto-Iglesias

Universidad Politécnica de Madrid | UPM · Departamento de Arquitectura y Construcción Navales

Shared mooring can potentially be a cost-reduction factor for future floating wind farms. To assess the effect of shared mooring on the response dynamics of floating wind turbines (FWTs), experiments have been conducted for two spar FWTs with a shared mooring configuration and for a single spar FWT with catenary mooring, both at a scale of 1:47. Va...

Various types of floating solar photovoltaic (FPV) devices have been previously proposed, designed and constructed with applications primarily limited to onshore water bodies or near-shore regions with benign environmental conditions. This paper proposes a novel FPV concept which can survive harsh environmental conditions with extreme wave heights...

This work evaluates the experimental test results regarding the operational performance of a free-float capable tension leg platform with a 10 MW wind turbine. It covers the platform dynamics in the selected installation area: Ribadeo, Spain. The model and the facility are initially presented, along with the experimental setup and the load cases. T...

Semi-submersible floating wind turbines are generally equipped with heave plates to introduce additional hydrodynamic damping and decrease the platform's natural frequency. Scale effects are one of the most critical problems concerning the accuracy of model-scale experiments on these damping-augmenting devices. The current research aimed to assess...

The convergence of the integral smoothed particle hydrodynamics (SPH) solution to the advection-diffusion equation in two dimensions in the particular case of a rigid rotation transport velocity field, is established in this paper. The approximation to the Laplacian operator is considered (Morris et al. 1997). The convergence of the SPH solution to...

The work introduces the experimental test results of a free-float capable tension leg platform in operational conditions. The structure is a self-stable tension leg platform with a 10MW wind turbine. Initially, the model and the experimental facility are described. System identification cases are provided to show the natural frequencies, responses...

This paper presents an experimental study of a passive version of the Water-jet vortex generator to reduce the drag force over a NACA 661-012 hydrofoil. The passive blowing used the overpressure zone at the leading edge of the hydrofoil's lower surface as a source of water jets that create jets on the upper surface of the hydrofoil using the blowin...

The convergence of the continuous Smoothed Particle Hydrodynamics (SPH) solution to the advection–diffusion equation is established in this paper. As a by-product of this result, the convergence of the SPH heat equation is also established. The most prevalent SPH approximations to diffusion operators are considered. The convergence is demonstrated...

This paper describes the results of an experimental campaign aimed at the determination of heave hydrody-namic coefficients for a column of a floating wind turbine platform, equipped with a solid heave plate. The tests are carried out with an experimental system that allows performing both heave forced oscillation tests and heave decay tests. A spe...

The most salient result in this paper is that, when setting additional viscous damping due to heave plates for your potential flow simulations, choosing a representative KC is far more important than innacuracies due to eventual scale effects.

The most salient result in this paper is that, when setting additional viscous damping due to heave plates for your potential flow simulations, choosing a representative KC is far more important than innacuracies due to eventual scale effects.

The paper presents the towing tests of CENTEC-TLP, a state-of-the-art free-float capable tension leg platform supporting a 10 MW wind turbine. The platform's design process and the overall dynamic behaviour was previously described in the literature. This work focuses on the platform's transportation stage, which is designed to have a shallow draft...

The smoothed particle hydrodynamics (SPH) method is used in this paper to model micropolar fluids, with emphasis on their dissipation mechanisms. To this aim, a dissipation function is defined at the particle level which depends on the relative velocity between particles but also on an additional spin degree of freedom, which modifies such relative...

Dear Colleagues, I will guest edit a Special Issue for JMSE with Prof. Antonio Souto-Iglesias, and Prof. Carlos Guedes Soares. It will be an open-access publication where your research will have higher visibility. I am attaching the details below and look forward to your contribution to this special issue. -------------------- Offshore wind powe...

This work shows the implementation of the improved SiL (Software-in-the-Loop) method to integrate the wind turbine dynamics in the wave tank test campaign of the 1/60 scaled CENTEC tension leg platform (TLP). The SiL has been successfully applied in several test campaigns and originally, the method introduced only the thrust loading, but recently,...

This paper presents a brief review of grand challenges of Smoothed Particle Hydrodynamics (SPH) method. As a meshless method, SPH can simulate a large range of applications from astrophysics to free-surface flows, to complex mixing problems in industry and has had notable successes. As a young computational method, the SPH method still requires dev...

The aim of this work is to study the solution of the smoothed particle hydrodynamics (SPH) discrete formulation of the hydrostatic problem with a free surface. This problem, in which no time dependency is considered, takes the form of a system of linear equations. In particular, the problem in one dimension is addressed. The focus is set on the con...

Bezunartea et al. Scale Effects on Heave Plates for Semi-Submersible Floating Offshore Wind Turbines: Case Study With a Solid Plain Plate (Journal of Offshore Mechanics and Arctic Engineering, Vol. 11, pp 1–14, 2019) studied scale effects on the hydrodynamics of heave plates by conducting model scale experimental tests. Three models with different...

Uniqueness of solutions to the SPH integral formulation of the hydrostatic problem, and the convergence of such solution to the exact linear pressure field, are theoretically demonstrated in this paper using Fourier analytical techniques. This problem involves the truncation of the kernel when the Dirichlet boundary condition (BC) on the pressure i...

An innovative Bayesian motion-based wave inference method is derived and assessed in this work. The evaluation of the accuracy of the proposed prior distribution has been carried out using the results obtained during a dedicated experimental campaign with a scale model an Oil and Gas (O&G) semisubmersible platform. As for the Bayesian statistical i...

An angular momentum conservative pure bulk viscosity term for smoothed particle hydrodynamics (SPH) is proposed in the present paper. This formulation permits independent modeling of shear and bulk viscosities, which is of paramount importance for fluids with large bulk viscosity in situations where sound waves or large Mach numbers are expected. W...

In the case of SPAR or semi-submersible platforms for floating wind turbines, it is beneficial in some cases to use heave plates that reduce their heave motion amplitude and/or tune their heave natural period. As part of the Hiprwind project, it was decided to study scale effects on the hydrodynamics of this element. To this aim, models of one leg...

Motion based wave inference allows the estimation of the directional sea spectrum from the measured motions of a vessel. Solving the resulting inverse problem is challenging as it is often ill-posed; as a matter of fact, statistical errors of the estimated platform response functions (RAOs) may lead to misleading estimations of the sea states as ma...

The question of whether it is possible to set relevant, robust and reliable benchmarks for viscous free-surface flows with complex free-surface dynamics is investigated in this work. The proposed method for finding an answer to this question consists of selecting three conditions leading to increasing flow complexity and to simulate them using thre...

The performance of an oscillating water column device with L-shape chamber has been investigated experimentally to explore beneficial aspects of the implemented geometrical configuration. This work is mainly focused on the assessment of the primary efficiency as well as the amplification factor of the device. The obtained results revealed that the...

The ECTS, European Credit Transfer System, is now widely used throughout higher education institutions as it facilitates student mobility within Europe and the comparison of study programs and courses. Most European institutions provide students with the number of ECTS each course and module is worth. A full-time student needs to complete 60 ECTS p...

The original version of this article unfortunately contained a mistake. The name “Antonio Souto-Inglesias” should be corrected to “Antonio Souto-Iglesias”. © 2018 Springer Science+Business Media B.V., part of Springer Nature

A volume-of-fluid (VOF) finite volume model under the ANSYS® Fluent framework was coupled with the response surface method (RSM) to find the best operating conditions within a jettability window for two selected responses in a drop-on-demand inkjet printing process. Twenty-five runs were generated using a face centred design and numerical simulatio...

In this work, the Smooth Particle Hydrodynamics (SPH) method, a Lagrangian mesh-free numerical scheme, is adapted for the first time to resolve thermal–mechanical–material fields in a range of Laser Fusion Additive Manufacturing processes. The method is capable of simulating large-deformation, free-surface melting, flow, and re-solidification of me...

An essential aspect of experimental campaigns in ocean basins is the extrapolation of results to prototype scale. In the case of “spar” or semi-submersible platforms for floating wind turbines, it is customary to use heave plates that reduce the heave motion and/or tune its period. As part of the Hiprwind project, it was decided to study the scale...

The aim of this work is to approach the full design of an anti-roll tank through numerical simulation, looking for the way to minimize the computational cost. The results have been validated with experiments from a rectangular tank, a tank with a C-shaped section and a rectangular tank with baffles. These tests were performed for 3 and 6 degrees of...

Kitefoil boards are a novel, emerging and disrupting class of sailing crafts, with major economical implications for the tourism sector due to their capability to enable kitesurfing in light wind areas. This paper investigates the hydrodynamics of the underwater appendage of a state-of-the-art kitefoil with a potential flow panel method implemented...

A hybrid Lagrangian Voronoi–SPH scheme, with an explicit weakly compressible formulation for both the Voronoi and SPH sub-domains, has been developed. The SPH discretization is substituted by Voronoi elements close to solid boundaries, where SPH consistency and boundary conditions implementation become problematic. A buffer zone to couple the dynam...

The second-order hydrodynamics of a semisubmersible offshore wind turbine is investigated in this paper by analyzing and proposing a set of different options for estimating the slow-drift motions during its design. A case study consisting of a three-floater semisubmersible designed to support a 1.5Mw turbine is considered. An experimental campaign...

Stokes' hypothesis, the zeroing of the bulk viscosity in a Newtonian fluid, is discussed in this paper. To this aim, a continuum macroscopic fluid domain is initially modeled as a Hamiltonian system of discrete particles, for which the interparticle dissipative forces are required to be radial in order to conserve the angular momentum. The resultin...

In situations where liquids need to be carried at cryogenic temperatures, evaporation and condensation effects acquire a major importance. Moreover, when sloshing occurs, large pressure variations are induced and influence rates of evaporation or condensation. Thermal conditions then play a crucial role when determining tank pressures. Several SPH...

Single-phase two-dimensional flow past a circular cylinder intersecting, or close to, a free surface at a Reynolds number of 180 is numerically investigated in this paper series using the Smoothed Particle Hydrodynamics (SPH) method. The wake behavior for Froude numbers between 0.3 and 2.0, based on the diameter, and for submergence-diameter ratios...

In the present work, the energy conservation properties of the Smoothed Particle Hydrodynamics (SPH) are investigated in the presence of fluid-solid interactions. Similarly to the fluid phase, the solid bodies are modelled through solid particles so that the whole solid-fluid domain can be described as a unique particle system. The pressure and vel...

The aim of this work is to carry out numerical simulations in the time domain of seakeeping problems taking into account internal flow in tanks, including sloshing. To this aim, a Smooth Particle Hydrodynamics (SPH) solver for simulating internal flows in tanks is coupled in the time domain to a Finite Element Method (FEM) diffraction–radiation sol...

Flow past a circular cylinder close to a free surface at low Reynolds number is investigated numerically in this paper extending the work done in previous 2014 and 2015 OMAE papers [1, 2]. In the former, the dependence of the flow with the submergence was discussed and in the latter the flow at high Froude numbers was investigated. It was found tha...

Abstract For the past few years, heave plates have been used in the offshore industry due to their favorable hydrodynamic characteristics in oscillating flows, i.e., increased added mass and damping. The hydrodynamic coefficients of heave plates are strongly influenced by the proximity of solid boundaries. Assessing how this variation depends on th...

Hydrodynamic forces on heave plates for a semi-submersible floating offshore wind turbine are discussed herein. A model of one of the platform columns has been built. This allows for the fitting of either a plain solid plate or the real heave plate prototype design. The latter is equipped with a vertical flap at its edge. The influence of the flap...

9 Continuing along the path of previous papers in this series, the present paper addresses, experimentally, sloshing in a rectangular tank under harmonic angular forcing. Since lateral and roof impacts are relevant in sloshing assessment and present distinct dynamics, these have been studied. Water and oil have been used in order to obtain data for...

Ships at sea almost invariably carry liquids onboard, and liquids are contained in appropriate tanks. Being able to take into account the effects of liquids onboard when predicting ship motions is, therefore, of utmost importance for the safe operation of a vessel. In certain conditions, such predictions also require taking into account nonlinearit...

Two-dimensional monophasic flow past a circular cylinder intersecting or close to a free surface at Reynolds 180 is numerically investigated using the Smoothed Particle Hydrodynamics (SPH) method. The wake behaviour for a range of conditions with Froude numbers between 0.3 and 2.0, a gap ratio of 0.55 and for a half-submerged cylinder are studied....

An analysis of the amount of hydrogen taking part in the explosions that happened during the Fukushima-Daiichi (Unit 1) nuclear power plant accident is presented herein. Through a series of analytic approximations and numerical calculations of increasing complexity, it has been possible to estimate that 130 kg of H 2 was involved in the explosion....

An analysis of the amount of hydrogen taking part in the explosions that happened during the Fukushima-Daiichi (Unit 1) nuclear power plant accident is presented herein. Through a series of analytic approximations and numerical calculations of increasing complexity, it has been possible to estimate that 130 kg of H2 was involved in the explosion. A...

The performance of a time domain Rankine panel method applied to the seakeeping problem of two ships in side-by-side configuration is investigated in this article. Benchmark data for the numerical results are provided by fundamental seakeeping tests carried out in the towing tank of the CEHINAV-Technical University of Madrid. The multi-body system...

AZIMUT project (Spanish CENIT R & D program) is designed to establish the technological groundwork for the subsequent development of a large-scale offshore wind turbine. The project (2010-2013) has analyzed different alternative configurations for the floating offshore wind turbines (FOWT): SPAR, tension leg platform (TLP), and semisubmersible plat...

Flow past a circular cylinder close to a free surface at low Reynolds and large Froude numbers is investigated numerically using the Smoothed Particle Hydrodynamics model. This meshless method allows for a non-diffusive computation of the free surface evolution, even while breaking and fragmentation may occur. The distance of the cylinder to the fr...

Performance of heave plates used in offshore structures is strongly influenced by their added mass and damping, which are affected by proximity to a boundary. A previous paper by the authors presented numerical simulations of the flow around a circular solid disk oscillating at varying elevations from seabed [1]. The force calculated was used to ev...

Hydrodynamic forces on heave plates for a semisubmersible floating offshore wind turbine are discussed in this paper. Results from experiments in which added mass and damping coefficients have been measured are presented. A model which allows the fitting of a plain plate and the real reinforced one has been built. The experimental campaign comprise...

Seakeeping behaviour of a multibody system in side-by-side configuration in head sea condition is discussed in this paper. The system, which can be assimilated to a FLNG and LNG carrier during an offloading operation is composed of a barge and a prismatic geosim with two gap values. Seakeeping tests in regular waves have been performed in the model...

This paper discusses the experimental campaign conducted by CEHINAV-UPM research group as request of IBERDROLA within the OCEAN LIDER RD project framework. The purpose of the campaign has been the hydrodynamic performance of a tension leg platform to support a wind energy turbine (TLPWT). The turbine chosen in this study has been the 5MW reference...

(paper in Spanish) The objective of this article is to establish a framework to discuss the use of free and proprietary software alternatives in the context of higher education in Spain. With this aim, the functions of university as an institution that trains competent professionals, capable of carrying out existing tasks but capable also of contr...

In this paper, the relationship between stability, safety and operability for small fishing vessels is investigated. To this aim, a relevant set of small fishing vessels is selected. These have similar main dimensions and capsized in stability related accidents between 2004 and 2007. The stability and operability characteristics of such vessels are...

The present paper focuses on the analysis of impact pressure registrations from repeated model scale sloshing experiments under harmonic rotational excitation. A series of more than 100 experiments, each one encompassing more than 100 impact events, has been conducted seeking the highest feasible repeatability. Different excitation periods, that co...

The analogies between the Moving Particle Semi-implicit method (MPS) and Incompressible Smoothed Particle Hydrodynamics method (ISPH) are established in this note, as an extension of the MPS consistency analysis conducted in Souto-Iglesias et al. (2013).

A course focused on the acquisition of integration competencies in ship production engineering, organized in collaboration with selected industry partners, is presented in this paper. The first part of the course is dedicated to Project Management: the students acquire skills in defining, using MS-PROJECT, the work breakdown structure (WBS), and th...

The objective of this research work has been to conduct experimental measurements on a dam break flow over a horizontal dry bed in order to provide a detailed insight, with emphasis on the pressure loads, into the dynamics of the dam break wave impacting a vertical wall downstream the dam. The experimental setup is described in detail, comprising s...

The consistency of Moving Particle Semi-implicit (MPS) method in reproducing the gradient, divergence and Laplacian differential operators is discussed in the present paper. Its relation to the Smoothed Particle Hydrodynamics (SPH) method is rigorously established. The application of the MPS method to solve the Navier-Stokes equations using a fract...

A theoretical and numerical model for a fully coupled angular motion single degree of freedom dynamical system has been developed in the first part of the present work. The system has been analyzed and placed in the framework of tuned liquid dampers (TLD) and a hybrid mass liquid dampers (HMLD) theory. An experimental investigation is conducted in...

A single degree of freedom angular motion dynamical system involving the coupling of a moving mass that creates an external torque, a rigid tank, driven by this torque, and fluid which partially fills the tank, is analyzed in the present paper series. The analysis of such a system is relevant for understanding the energy dissipation mechanisms resu...

This article is a reflection on the equivalence in hours of work of an ECTS credit through a monitoring effort initiative conducted jointly by the School of Industrial Engineering of Toledo (University of Castilla la Mancha - UCLM), the Naval Architecture Department (Universidad Politécnica Madrid) and the Faculty of Education (UCLM). Comparisons o...

A number of similar Spanish fishing vessels designed and built after the entry into force of the 1998 fishing effort control regulations —Royal Decree 2287/1998—capsized in a relatively short period of time (2004–2007). The accidents are described and identified herein as a statistical anomaly within the Spanish fleet. The main dimensions and initi...

In the present paper, the consistency of continuous SPH approximations to the differential operators appearing in the Navier-Stokes system is analyzed. In particular, emphasis is made on the consistency of such operators when evaluated close to the boundaries of the fluid domain and flow extension techniques are applied. The divergence of the veloc...

AZIMUT project (Spanish CENIT R&D program) is designed to establish the technological groundwork for the subsequent development, of a large-scale offshore wind turbine. The project (2010–2013) has analysed different floating offshore wind turbines (FOWT): SPAR, TLP and Semi-Submersible platforms were studied. Acciona, as part of the consortium, was...

This paper studies how the hydrodynamics coefficients of added mass and damping varies when an oscillating disk approaches a seabed. Analysis was performed by OpenFOAM code using the ‘PIMPLE’ algorithm. The simulations considered the flow as laminar and hence no turbulence model was used. Simulations were conducted for a solid disk of 200 mm diamet...

The smoothed-particle-hydrodynamics (SPH) method has been used to study the evolution of free-surface Newtonian viscous flows specifically focusing on dissipation mechanisms in gravity waves. The numerical results have been compared with an analytical solution of the linearized Navier-Stokes equations for Reynolds numbers in the range 50-5000. We f...

A course focused on the acquisition of integration competencies in ship production engineering, organized in collaboration with selected industry partners, is presented in this paper. The first part of the course is dedicated to Project Management: the students acquire skills in defining, using MS-PROJECT, the work breakdown structure (WBS), and th...

The intact stability of five small Spanish fishing vessels with ages between 3 and 8 years old which sunk in stability related accidents between 2004 and 2007 is compared to the stability of the fishing vessels which were retired from service to build those. The seakeeping performance of both sets of vessels is also compared. The differences found...

Este artículo muestra un análisis comparativo del comportamiento en la mar de una plataforma semi-sumergible utilizada para soportar una turbina eólica offshore. En él, se muestra la influencia que tiene el modelado de los bracings en los movimientos de la plataforma. Se ha utilizado como modelo la semi estudiada por el ECN [Energy Research Centre...