Carlos Levi

Carlos Levi
Federal University of Rio de Janeiro | UFRJ · Departamento de Engenharia Naval e Oceânica (DENO)

Doctor of Engineering

About

23
Publications
2,842
Reads
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125
Citations

Publications

Publications (23)
Article
The dynamic behaviours of subsea pipe-valve structures—the principal components of subsea equipment—are of critical concern for the control of the lowering through the splash zone during installation. Nonlinear interactions between waves and pipe-valve combinations are challenging the investigation of the wave forces acting on large-dimension struc...
Article
As one of the renewable and clean energy sources, wave energy has high density and all-day availability characteristics. However, the development of wave energy converters has been hampered, mainly because of the low efficiency induced high levelized energy costs. The present study introduces an improved bistable mechanism composed of three linear...
Article
The controllability and maneuverability of an Autonomous Underwater Vehicle (AUV) in practical applications need to be properly validated and assessed before the prototype is finalized for manufacturing. With regard to mathematical system model of the AUV, hydrodynamic coefficients have a dominant effect on the quality of vehicle pre-testing and ev...
Article
Full-text available
Lower efficiencies induce higher energy costs and pose a barrier to wave energy devices’ commercial applications. Therefore, the efficiency enhancement of wave energy converters has received much attention in recent decades. The reported research presents the double snap-through mechanism applied to a hemispheric point absorber type wave energy con...
Book
Full-text available
This is a reprint of articles from the Special Issue published online in the open access journal Energies (ISSN 1996-1073) from 2018 to 2019 (available at: https://www.mdpi.com/journal/energies/special issues/marine).
Article
Full-text available
This study, firstly, provides an up-to-date global review of the potential, technologies, prototypes, installed capacities, and projects related to ocean renewable energy including wave, tidal, and thermal, and salinity gradient sources. Secondly, as a case study, we present a preliminary assessment of the wave, ocean current, and thermal gradient...
Article
Mechanical restoration of a point absorber (PA) wave energy converter (WEC) featured a nonlinear stiffness system built by conventional mechanical compression springs (NSMech). Numerical simulations conducted here considered irregular waves in a specific sea site. Results showed considerable improvement for a given suitable spring configuration (le...
Chapter
In 2009, the general development plan for the Federal University of Rio de Janeiro (Plano Diretor UFRJ 2020 in Portuguese) was approved for the period between 2009 and 2020. A significant effort was made to incorporate in-house innovative solutions as much as possible. Such strategy was supposed to (1) directly benefit the University with solutions...
Article
Wave–current flow is a phenomenon that is present in many practical engineering situations. Over thepast several decades, this type of flow has been increasingly investigated under controlled laboratory con-ditions. This paper presents a numerical study of wave–current flow in the ocean basin of the LabOceano(COPPE/UFRJ). A homogeneous multiphase m...
Article
This work deals with an experimental investigation of the flow around a pair of identical cylinders in staggered configuration, subjected to cross-flow and forced harmonic motion. The investigation aims to estimate the flow frequency content from measured hot-film data and to identify the occurrence of synchronization between the flow and cylinder...
Article
An innovative concept of station-keeping system to be used in Floating, Production, Storage and Offloading (FPSO) production units located in deep waters is described. The new concept combines the conventional catenary mooring lines (namely, spread mooring), in a special configuration known as 'Differential Complacency Anchoring System – DICAS', wi...
Conference Paper
Full-text available
As operações de approaching entre navios petroleiros ou o abastecimento entre navios militares no mar são operações que envolvem mais de um navio com velocidade de avanço, incorporando ao problema da dinâmica de navios o efeito da interferência hidrodinâmica devido às ondas irradiadas e difratadas entre os navios envolvidos. O presente trabalho apr...
Article
The present paper discusses an experimental technique to measure the correlation length related to typical flexible model of marine riser. The relative correlation coefficient and correlation length were compared for rigid and flexible cylinders. The results show that for each cylinder there was a specific subcritical Reynolds number where the corr...
Conference Paper
Full-text available
This paper discusses the investigations conducted to develop the hydraulic design of the flow conditioner of the current generation system of LabOceano. The performance of different flow conditioner configurations were numerically investigated by means of computational fluid dynamics techniques. The numerical results were validated against experime...
Article
The Vortex-Induced Vibration on a circular cylinder is investigated by the numerical solution of the two-dimensional Reynolds Averaged Navier-Stokes equations. Results are compared with experimental measurements obtained by different author to verify the quality of the numerical solution. The Beam and Warming implicit factorization scheme is used t...
Conference Paper
This paper presents a study of a Production and Storage Spar Platform concept design for operations in deep water, under the environmental conditions of the Campos Basin, Brazil. This study is the result of a research sponsored by Agência Nacional do Petróleo – ANP. The theme was chosen due the good results obtained by this kind of platform in the...
Article
Full-text available
Systematic experiments were carried out in a wave-tank in order to investigate the high-frequency resonant response of a flexibly mounted vertical cylinder due to waves. For this lightly damped structure, ringing responses with high structural accelerations were observed in breaking wave groups. Structural deflections (first bending mode) have also...
Article
The paper presents an overview of the methods used in the INPLA system which permits studies to be carried out on the behaviour of floating structures, semi-submersibles and tension leg platforms, when used for exploitation of oil in deep waters. (from authors' abstract)

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