ISE - Relatórios técnicos
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- Turbulence-MethodsPublication . Lima, Margarida
- Porosity Effect in a Molten Salt ThermoclinePublication . Lima, Margarida; Costa, Paula SilvaABSTRACT: Thermal Energy Storage (TES) is essential for solar energy applications when the demand is not in phase with the supply of Solar Energy Molten salt thermocline storage tanks and can be a low cost option for thermal energy storage in Concentrating Solar Power (CSP) systems. To analyze the dynamics of a one tank a 2D already validated with data obtained from literature (Rojas, 2013) accounts separately for filler and molten salt regions due to their different thermos-physical properties. In the tank, between hot and cold zones a temperature gradient is established. This interface zone, called thermocline, is responsible for the whole performance of the storage tank. Properties of fillers and molten salt can increase substantially the one tank efficiency by improving its stratification. This work analyses the particles size of filler in a specific set in order to account for the influence of this parameter in the performance of the storage thermocline tank. The work makes a review on the effect of the aspect ratio in the thermocline performance and ends with a mixture of the two influences.
- Differential Equations and Courant Number: A short studyPublication . Lima, MargaridaABSTRACT: The considerations presented in this report result from the analysis performed in the context of the project NewSol. Even if it is not pertinent to the development of the work, they were needed to obtain a correct modelling. While modeling is being done, a theoretical support was carried on. To give support to the chosen method, or going in some direction, several methods were presented for comparison.
- Aplicações a Engenharia: Algumas aplicações do Software ANSYS FluentPublication . Lima, MargaridaRESUMO: Com uma larga experiência, o Computer Fluid Dynamic (CFD) ANSYS é referência mundial em simulação computacional. As suas ferramentas são usadas por líderes de mercado para transformar a maneira de projetar, permitindo aos engenheiros explorar e prever como os produtos vão funcionar no mundo real. O objetivo é, reduzir custos com protótipos e tempo de produção, melhorar a qualidade, diminuir riscos, acelerando a inovação em todos os setores para ultrapassar os limites previstos nas diferentes áreas do saber. A plataforma de trabalho do ANSYS é atrativa e intuitiva. Nela inicia-se o modelo ou os componentes dos modelos a construir em geral em 2D ou 3D. Tem compatibilidade como CAD e outros programas. No caso da termodinâmica, fluidos sem ou com componentes (thermoclines ) utiliza-se o pacote de Fluids. Com ele resolvem-se as equações de convecção, turbulência e mesmo da radiação nas fronteiras que definem o projeto em causa. Também se analisam as componentes que se podem otimizar em função do estudo pretendido. Os meios porosos estão, pois, largamente incluídos.
- Megafloat inicial state of ArtPublication . Lima, Margarida
- Small ANSYS ReportPublication . Lima, Margarida
- Otimização utilizando MatlabPublication . Lima, Margarida
- Computation of Hydrodynamic Coefficients for Submerged Spheres: A Comprehensive AnalysisPublication . Justino, Paulo AlexandreABSTRACT: Hydrodynamic coefficients are essential parameters in fluid mechanics that serve to quantify the complex interaction between a submerged body and the surrounding fluid . Specifically in the context of submerged spheres, these coefficients provide a measure of the forces and moments exerted by the fluid on the sphere, or conversely, the resistance the sphere encounters as it moves through the fluid . Understanding and accurately determining these coefficients is paramount for a wide range of applications, including the design and control of underwater vehicles, the analysis of offshore structures, and the prediction of the behavior of marine organisms. The accurate prediction of wave loads on submerged structures also relies heavily on the evaluation of these coefficients. The significance of hydrodynamic coefficients lies in their ability to simplify the complex physics of fluid-structure interaction into manageable parameters. For instance, the added mass coefficient reflects the inertia of the fluid that is accelerated along with the moving sphere, effectively increasing the sphere's apparent mass. This phenomenon is critical in dynamic analyses, as the inertial forces are directly influenced by this added mass. Similarly, the drag coefficient quantifies the resistance force that opposes the sphere's motion, a force primarily attributed to viscous effects and the pressure distribution around the body. In certain flow regimes, particularly involving non-uniform flow fields such as those induced by waves or in the presence of rotation, a lift coefficient may also become relevant, representing a force acting perpendicular to the direction of motion. The accurate determination of these coefficients, which can be linear or nonlinear depending on the complexity of the fluid-structure interaction, is a crucial step in the design and analysis of any system involving submerged spheres. The interaction between a submerged sphere and the surrounding fluid exemplifies a fundamental fluid-structure interaction problem. When a solid object like a sphere is placed in the path of a fluid, the fluid exerts pressure and viscous forces on the sphere's surface, potentially leading to its motion or deformation. Conversely, the presence and motion of the sphere alter the flow field of the fluid. Hydrodynamic coefficients serve as the critical link in understanding this bidirectional influence, allowing engineers and researchers to predict the dynamic response of the sphere to fluid forces and the impact of the sphere's motion on the fluid environment. For example, in the context of underwater explosions, the structural response of a submerged body significantly affects the dynamics of the explosion bubble, highlighting the intricate nature of fluid-structure interaction where hydrodynamic coefficients play a vital role.
- Dissemination Activity Report - 5th Edition: Deliverable D7.4Publication . Sousa, Filipe; Simões, TeresaABSTRACT: This report presents the dissemination activities conducted in the scope of TradeRES project during the last 10 months, and the main highlights of the overall project. The content of this report follows the dissemination and exploitation plan (D7.2) and corresponds to an update of the information reported in the previous editions of the progress dissemination report (D7.4 – Dissemination Activity Report). This report describes the key target groups and the key performance indicators (KPI) achieved at the end of the project - general promotion of the project, social media, traditional media promotion and communication of regular news and announcements, publication in scientific journals, special book chapters and participation in workshops and international conferences, organization of scientific events, conferences, workshops, thesis, and dissemination material. Finally, an analysis of the most relevant activities and KPIs is presented in the conclusions. During the development of the project, there was the need to revise the accounting methodology, at the beginning of the 4th year, and the new metrics were applied to the whole duration of the activities. The extension period that was granted to the project, proved to be very valuable, as it allowed for a more comprehensive dissemination of the outcomes, provided additional time to achieve efficient and accurate results, and enabled the preparation of dissemination materials in a more robust manner. The last year of the project was very productive enable to address some KPIs that were missing and further enhance others. In addition, although the great majority of the KPIs were already achieved at the beginning of the last reporting period, the extension of the project, enabled to overcome the foreseen outcome. For example, it was possible to publish 40 conference papers and 40 journal papers, in both cases 100% above the targets outlined in the plan.
- Report 2023 : PortugalPublication . Couto, António; Simões, Teresa; Costa, Paula Silva; Estanqueiro, AnaABSTRACT: In 2023, the new installed wind power capacity amounted to 159 MW. This capacity refers to overcapacity procedures, building on existing sites. Important milestones were attained by the ministerial working group created by the Portuguese government to accelerate the offshore wind market, expecting a total installed capacity of 10 GW.