Carlos Guedes Soares

Carlos Guedes Soares
University of Lisbon | UL · Centre for Marine Technology and Ocean Engineering (CENTEC)

Phd

About

2,528
Publications
788,450
Reads
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39,929
Citations
Additional affiliations
January 2014 - present
University of Lisbon
Position
  • Scientific Coordinator
June 1984 - January 2014
Technical University of Lisbon
Position
  • Professor (Full)

Publications

Publications (2,528)
Article
Sandwich pipe is one of the most promising subsea pipelines for oil and gas transportation in deep waters due to its high-strength performance and thermal insulation. The gradient of the temperature distribution through the cross-section of sandwich pipes may be significant due to good thermal insulation of the core layer, so it is necessary to con...
Article
Different models are considered to estimate the minimum air gap of a semi-submersible accommodation unit in stormy conditions. The results are compared to quantify the epistemic uncertainties in the estimation of the minimum air gap. While both first- and second-order methods have been broadly considered in the literature to evaluate the air gap of...
Article
Quasi-static tensile behaviour and failure characteristics of composite single-lap single-bolt sandwich joints with different geometric parameters are investigated experimentally and numerically. A finite element model is also established and a progressive failure analysis is conducted to predict the ultimate loads, ultimate displacements, strain,...
Article
The pseudo-shakedown phenomenon for rectangular plates subjected to repeated impacts is studied using a numerical simulation method. The wide applicability of the finite element modelling techniques for repeated impacts is validated against reported experimental results on different structural components. The dynamic response of the plates, such as...
Article
The ship domain concept is of great interest for ship traffic modelling, risk assessment and intelligent collision avoidance. The paper proposes and applies a method to define AIS data-based empirical polygonal ship domains, based on traffic density matrices that are derived around each reference ship from an AIS dataset. A modified Quaternion Ship...
Article
The increasing attention and rapid development of intelligent ship technologies makes it possible to real applications to merchant shippings. The mixture of conventional and intelligent ships will be the most likely new scenario in the future. Multi-ship collision avoidance decision-making and the cooperation between them are the keys to ensure saf...
Article
This paper presents a two-stage stochastic programming with recourse methodology to solve the Supply Vessel Planning Problem with Stochastic Demands (SVPPSD), a problem arising in offshore logistics and which generalizes the Periodic Vehicle Routing Problem with Stochastic Demands and Time Windows. In the SVPPSD, a fleet of vessels is used to deliv...
Article
Analytical solutions to study the elastic dynamic responses of a flat composite plate are developed based on the orthotropic thin plate theory and modal analysis. The spatial uniform slamming pressure is simplified to two types of time-dependent impact loads, i.e. an exponentially decaying impulse and a triangle impulses, which are characterized by...
Article
Full-text available
Results are presented of a benchmark study organised by the ISSC-ITTC Joint Committee on global linear wave loads on a container ship with forward speed. The aim of the study is the assessment of the uncertainty in linear transfer functions due to different seakeeping codes and consequences on long-term extreme vertical wave bending moments. Seven...
Article
The paper presents the experimental results of scaled double-hull specimens tested by applying local imposed deformations by two different rigid indenters. The quasi-static experiments are performed to investigate the crushing behaviour of the steel structure in ship collision scenarios. Finite element models are also established to calculate the c...
Article
Full-text available
This paper proposes an FMEA-BN model to determine the inspection and opportunistic maintenance strategies of floating offshore wind turbines. A mapping algorithm is proposed to establish a mirrored Bayesian Network (BN) model from a given failure mode and effect analysis (FMEA) structure to realize the FMEA-BN modelling, which is efficient to consi...
Article
Numerical simulations are increasing their importance as an alternative to physical tests in the field of hydrodynamics. To ensure the accuracy of numerical results, quantification of associated uncertainties is crucial. In this paper, comparisons are made between the uncertainty quantification methods and the accuracy of mesh-free and mesh-based s...
Article
A 3D hydroelastic model subjected to linear wave interaction with horizontal flexible floating and submerged porous structures is developed. The dispersion relation of the aforesaid problem is derived based on Green’s functions approach in water of finite and infinite depths. Three-dimensional Fourier-type expansion formulae for the velocity potent...
Article
This paper presents the numerical and experimental study of a new spring mechanism adapted to a cone-shaped point absorber wave energy converter (WEC). The WEC is intended to be hinged to a floating wind platform with a long arm to create a combined wind and wave harvesting concept. The main objective of the spring mechanism is to improve the platf...
Article
The failure of corroded ultra-high-strength steel (X100 and X120) pipelines under combined axial loads and internal pressure is investigated numerically by finite element analyses, and an empirical model is proposed for burst strength prediction. The finite element structural models are constructed with uniformly oriented axial defects and consider...
Article
Uncertainties of wave data and models got increasing attention in the last decades by the marine industry because of their importance for safety at sea. Improved knowledge about wave description and related uncertainties leads to a reduction of safety factors, and consequently building costs of marine structures. The ISSC (International Ship and Of...
Article
This study is focused on the North Atlantic Ocean where the maritime activity is intense and accidents have occurred due to dangerous sea state conditions, including the occurrence of abnormal waves. The study is based on a 7-year period of numerical simulations performed with a 3rd generation wave model aiming to shed light on the spatial distribu...
Article
A numerical model associated with wave interaction with a moored articulated very large floating structure is presented. An analytical model is formulated under the linearized wave theory and small structural response and the analytical solution is obtained using the velocity decomposition method along with a matching technique. The effects of diff...
Article
The main objective of the present study is to develop an optimal life extension management strategy for ageing offshore wind farms. Finding the appropriate performance metric for an operation is essential for a durable, reliable, and profitable offshore wind farm operation. To this end, the key metrics to evaluate the life extension performance of...
Article
Full-text available
Buckle-initiation techniques, such as sleepers, are usually installed to trigger lateral buckling at pre-designated locations to release the axial compressive forces induced by thermal loading. Taking the nonlinear pipe–soil interaction model into account, a mathematical model is proposed to investigate the lateral buckling of subsea pipelines trig...
Article
Full-text available
A vision of the digital twins of the subsea pipelines is provided in this paper, with a coverage of the current applications and the challenges of the digital twins in the design, construction, service life, and assessments of life extension. Digital twins are described as a paradigm combining multiphysics modelling with data-driven analytics, whic...
Chapter
A 3D numerical model of a moored horizontal submerged structure, composed by a set of hinged plates attached to a vertical flap at its fore, intended to act as a WEC is presented. The horizontal submerged articulated float is composed of six hinged plates as to emulate a flexible horizontal plate. The numerical solution is calculated using BEM code...
Chapter
The interaction between an array of vertical flexible net-type structures and regular waves is investigated by model tests. The present study focuses on the effect of the reflection, the transmission, and the dissipation coefficients through the system consisting of an array of nets made of nylon silky and supported by the vertical steel frame. Sev...
Chapter
Full-text available
This paper investigates the nonlinear wave amplification around truncated and vertical, surface-piercing columns with different cross-sections. The wave evolution is evaluated for the stationary condition in the vicinity of a column with circular, square, and rhombus sections subjected to the non-breaking, steep regular waves. Moreover, the harmoni...
Chapter
Full-text available
In the present work, these techniques are applied to identify the expected extreme combin­ations of sea-states for different return periods. The extreme sea-state conditions are evaluated using a robustapproach based on the environmental contours of the main variables such as significant height and spectralpeak period (Hs-Tp). The computed values o...
Chapter
Full-text available
This paper presents a double Wiebe function to compute the behaviour of the combustion pro-cess and the performance of a marine biodiesel engine. This extends an earlier study in which the enginemodel was developed in a 1D engine simulation software and was calibrated using the pressure load diagramcollected from experimental data. The double-Wiebe...
Chapter
Full-text available
In this paper, the estimation of ship fuel consumption is computed for different weather condi-tions along the ship route. The propeller is first optimized for calm water conditions using a previous devel-oped optimization model coupling NavCad software and a nonlinear optimizer integrated in Matlab. Then, thepropeller performance and ship speed re...
Chapter
Full-text available
This paper presents a review of the hybrid model testing strategies for floating wind turbines. It examines the method’s accuracy, advantages, and weaknesses. The hybrid approach refers to tests that combine physical testing and numerical simulation in wave basin or wind tunnels. The coupling between the physical and numerical part is done via actu...
Chapter
Full-text available
A comparative study is presented on ship hull resistance and propulsion power predictionusing empirical formulations and a Computational Fluid Dynamics (CFD) based solution. The paper studiesthree benchmark ship hull models, two containers (KCS and DTC) and a tanker (KVLCC2) ship, using thecommercial numerical tool, NavCad, and the open source CFD...
Chapter
Full-text available
This work aims to study the application of ceramic coatings, an innovative and sustainable solution to reduce biofouling on ship hulls. The coating provides non-stick conditions that hinder biofouling growth extending the lifetime of the smooth hull surface and reducing the number of stops in dry dock. The surface roughness properties of three diff...
Chapter
Various strategies are currently investigated in the literature to meet decarbonization aim introduced by In-ternational Maritime Organization. These methods could be categorized under two headings; utilization and adaptation of alternative marine fuels & alternative energy sources and application of operational efficiency increasing methods. These...
Chapter
In this paper, prognostics and health management systems, and reliability centered maintenance strategy for the autonomous marine vessels have been evaluated. The application steps of the approaches are presented and the points to be considered in case the methods are applied in autonomous ship machinery systems are stated. As a result of the study...
Chapter
A numerical model of an entire fish cage under currents and waves is built using the finite element method. All the components in a fish cage are slender structures, thus, the hydrodynamic load is investigated by the Morison equation. The collar and the bottom ring are modelled by pipe and beam elements. The net, ropes and mooring lines are modelle...
Chapter
Preliminary experiments are conducted to study the dynamics of circular gravity cage on linear waves. Experiments are done in a flume 38.5 m long, with a simplified model of a cage, which includes a floating collar, a bottom ring and nets. The model is connected to supports above the flume by wires. Linear waves are applied in experiments. The upst...
Chapter
Full-text available
This work presents a comparison between the hydrodynamic behavior of three and four-column semi-submersibles. The platforms are the NAUTILUS and the OO-star semi-submersibles, with the DTU 10MW wind turbine. Both models are described, and simulations in wind and wave conditions are made using OpenFast. The natural frequencies and the response ampli...
Article
This paper presents an investigation on the ultimate strength of a ship hull girder model with openings. A model with relatively large openings in a group of compartments is designed and tested up to the ultimate bearing capacity under a pure sagging bending moment. The failure mode, the load-displacement curve and the ultimate load of the experime...
Article
Full-text available
The non-linear wave amplification around a truncated vertical cylinder, the high-order horizontal wave loading from non-breaking steep waves and the associated physical process are studied numerically. Considering the high-order free-surface deformation due to high-frequency wave scattering Type-1 and Type-2, and lateral edge waves, the simulations...
Article
This work studies the effects of the dynamic axial stiffness of elastic moorings on the dynamic behaviour of a point absorber wave energy converter. Following two mooring analysis procedures, coupled dynamic analysis of a taut-moored WEC with three legs is performed using the FEM program DeepC in three irregular wave conditions. Two synthetic fibre...
Article
The hydrodynamic forces and dynamic responses of subsea structures, like manifolds, are studied in the final phase of their installation when they are near the sea bottom. The hydrodynamic coefficients of a submerged 3D prism are predicted through the constant acceleration method, which is implemented by the CFD tool OpenFOAM. In the constant accel...
Preprint
Full-text available
A non-exhaustive review of the existing or proposed combinations of marine exploitation activities in multi-use configurations, either in co-location, integration, or island structure setups is presented. The reviewed de-signs involve the synergic combination of the marine uses for marine renewable energies (wind, wave, solar, tidal, OTEC, hydrogen...
Article
Full-text available
The paper proposes an integrated multi-criteria framework for assessing dynamically the ship collision risk under different scenarios. The framework identifies collision candidates, evaluates collision parameters and weights the importance of each collision parameter in different conditions, according to the ship officers’ experience. The informati...
Article
This work investigates different methodologies for the prediction of uncertainties related to ship fuel consumption along a specific route. Ensemble weather forecasts are adopted to estimate the uncertainties associated with the environmental conditions the ship is asked to face. A brute-force approach, consisting in repeating the fuel consumption...
Article
This paper introduces an effective method with a regularization filter function and conducts stability and convergence analysis for the estimation of the hydrodynamic coefficients of a manoeuvring model. The proposed method is used to estimate the adjustment coefficients of empirical manoeuvring models using free-running manoeuvring ship model test...
Article
The Andalusian Agency of Energy has identified three areas of major interest for harnessing wave energy, in their plan of “Marine Energy and Energy Resources of Andalusia”. One of these areas is located on the Atlantic coast, the bay of Cádiz. Considering this initial interest, the objective of this work is to carry out an evaluation of the perform...
Article
A series of 1:50 model tests are conducted to study the mooring dynamics of a dual-chamber floating oscillating water column device. This device consists of two chambers, namely one traditional oscillating water column chamber and one Backward Bend Duct Buoy chamber. To discuss the power take-off damping on system dynamics, the cap of each chamber...
Article
Full-text available
This paper presents a methodology aimed at improving the design of short sea shipping (SSS) services embedded in intermodal door-to-door transport chains. The cargo capacity of a Ro–Ro ship for such a service is estimated. The ship is assumed to operate in an integrated intermodal transport network comprising competing transport chains. The latter...
Article
In this paper, a fluid–structure interactions method which fully couples CFD and FEA solvers in a two-way manner is used to estimate ship wave loads and hydroelastic responses. The global motions, wave loads, and springing and whipping loads on a standard S175 containership model evaluated by the CFD–FEA coupling method are comprehensively investig...
Article
In order to investigate the influence of initial condition uncertainty on the profile of maximum wave, two typical short-term sea states are reconsidered in this paper. The associated uncertainty is investigated with the Monte Carlo Simulation method and the maximum wave is extracted from the numerical simulation performed with the fully nonlinear...
Article
Lateral buckling may occur for subsea pipelines operating under high-temperature conditions and buckle initiation techniques are usually employed to trigger man-made buckles at pre-designed locations to avoid rogue buckles. Based on the energy barrier, a new buckle initiation concept is proposed to trigger lateral buckling for subsea pipelines layi...
Article
The Fourier–Kochin theory—an indirect solution approach for the boundary integral representations of free-surface flows that rely on free-surface Green function—is investigated by considering effective computation and reliable prediction. The present study addresses wave–body interaction with zero forward speed by adopting a higher-order approximat...
Article
The objective of this work is to estimate the collapse pressure of steel pipelines subjected to random non-uniform general corrosion and localized corrosion. Non-linear, large deformation and three-dimensional finite element analyses are employed to assess the reduction in collapse pressure of the offshore pipelines under external pressure. The num...
Article
This paper assesses the uncertainty in the collapse strength of sandwich pipelines under external pressure predicted by various strength models in three categories based on interlayer adhesion conditions. First, the validity of the strength models is verified by comparing their predictions with sandwich pipeline collapse test data and the correspon...
Article
Three-dimensional effects on slamming loads predictions of a ship section are investigated numerically using the unsteady incompressible Reynolds-averaged Navier-Stokes (RANS) equations and volume of fluid (VOF) method, which are implemented in interDyMFoam solver in open-source library OpenFoam. A convergence and uncertainty study is performed con...