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Modelos de turbulĂȘncia aplicados a armazenamento de energia com THERMOCLINE
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Advisor(s)
Abstract(s)
RESUMO: Neste trabalho sĂŁo considerados os modelos de simulação em 2D de um tanque com thermocline, aplicando uma nova abordagem, considerando a modelação de vĂĄrias camadas. Esta nova abordagem resulta das caracterĂsticas de conceção do tanque que o tornam diferente dos usualmente utilizados. ApĂłs ter sido constatado que o modelo kâΔ, usualmente utilizado, se revelava inapropriado para descrever os fenĂłmenos que ocorrem neste tanque, resolveu-se optar por um modelo de turbulĂȘncia SST k â Ï mais sensĂvel no caso de domĂnios complexos e malhas variĂĄveis. Este modelo foi testado e comparado com novas hipĂłteses, nomeadamente a nĂvel das fronteiras viabilizando quer o tempo computacional de resolução do problema quer a sua convergĂȘncia e precisĂŁo. TrĂȘs parĂąmetros estiveram sempre em consonĂąncia, o time step, a dimensĂŁo da malha e a velocidade inicial.
ABSTRACT: In this work, 2D simulation models of a thermocline tank are considered applying a new approach, considering the modeling of several layers, boundary contour and more complex mesh. This new approach results from the design characteristics of the tank that make it different from the ones usually used. Considering all these phenomena that occur in this tank, it was decided to opt for a more sensitive SST k - Ï turbulence model in the case of complex domains and variable meshes. This model was tested and compared with new hypotheses, namely at the boundaries, making possible both the computational time to solve the problem and its convergence and precision. Three parameters were always in mind, the time step, the mesh size and the initial speed of the velocity.
ABSTRACT: In this work, 2D simulation models of a thermocline tank are considered applying a new approach, considering the modeling of several layers, boundary contour and more complex mesh. This new approach results from the design characteristics of the tank that make it different from the ones usually used. Considering all these phenomena that occur in this tank, it was decided to opt for a more sensitive SST k - Ï turbulence model in the case of complex domains and variable meshes. This model was tested and compared with new hypotheses, namely at the boundaries, making possible both the computational time to solve the problem and its convergence and precision. Three parameters were always in mind, the time step, the mesh size and the initial speed of the velocity.
Description
CIES2020 - XVII Congresso Ibérico e XIII Congresso Ibero-americano de Energia Solar
Keywords
Energy storage Modelling Simulation Thermocline tank
Pedagogical Context
Citation
Seram, V... [et.al.] - Modelos de turbulĂȘncia aplicados a armazenamento de energia com THERMOCLINE. In: CIES2020: As Energias RenovĂĄveis na Transição EnergĂ©tica: Livro de ComunicaçÔes do XVII Congresso IbĂ©rico e XIII Congresso Ibero-americano de Energia Solar. Helder Gonçalves, Manuel Romero (Ed.). Lisboa, Portugal: LNEG, 3-5 Novembro, 2020, p. 489-496
Publisher
LNEG - LaboratĂłrio Nacional de Energia e Geologia