Numerical model for calculation of hydraulic transiente and fluid-structure interaction in fluid transport systems
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2019
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INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE
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Resumo
In this study the effects of Fluid-structure Interaction during hydraulic transients, more precisely water hammer events, in fluid transport systems are investigated. For this purpose, a numerical model was developed to simulate the effects of Fluid-structure Interaction in a system composed of a reservoir with upstream constant level, a straight pipe and a valve
coupled downstream, which can be rigidly fixed or free to move. The transfer of energy from the fluid to the structure associated with pressure waves and their effects, that is, the efforts and displacements generated, is taken into account. The Method of Characteristics is used for solving the hyperbolic partial differential equations system, associated with finite differences
and linear interpolations procedures. Three coupling mechanisms are modeled: Friction, Poisson, and junction coupling. The proposed numerical procedure is validated by simulation of a benchmark problem and compared to analytical solutions found in the literature. The results indicated that the model is able to reproduce the main effects Fluid-structure Interaction during hydraulic transients in a pipe conveying fluids.
List of symbols
A - cross-sectional area, m2
c - classical wave speed, celerity, m/s
c˜ - FSI wave speed, celerity, m/s
D - inner diameter of pipe, m
E - Young modulus of pipe wall, Pa
e - pipe wall thickness, m
FSI - Fluid-Structure Interaction
G - shear modulus of pipe wall material, Pa
H - pressure head, m
K - fluid bulk modulus, Pa
L - length, m
MOC - Method of Characteristics
P - pressure, Pa
R - inner radius of pipe, m
T - period, s
t - time, s
u - pipe displacement, m
u̇ - pipe velocity, m/s
V - cross-sectional fluid velocity, m/s
x - axial coordinate, m
g - constant, m/s
𝜇 - Poisson ratio
Como referenciar
ALMEIDA, RAFAEL S.P.; ROCHA, MARCELO S. Numerical model for calculation of hydraulic transiente and fluid-structure interaction in fluid transport systems. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, October 21-25, 2019, Santos, SP. Proceedings... Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2019. p. 4731-4742. Disponível em: http://repositorio.ipen.br/handle/123456789/30701. Acesso em: 26 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.