Capability of structural-acoustical FSI numerical model to predict natural frequencies of submerged structures with nearby rigid surfaces
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hdl:2117/17764
Tipus de documentArticle
Data publicació2012-07-01
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Abstract
Structural–acoustical model is used in industry to determine natural frequencies of runners and impellers
in hydraulic turbomachinery in the stage of design. In these calculations the fluid domain is considered
with comparable large distances to stationary parts while there are parts of the submerged structure
(runner or impeller) that are extremely close (in relation to its thickness) to a rigid surface (hydraulic
seals). These seals are not considered in the numerical model because it is assumed that structural–
acoustical model is not capable to predict natural frequencies with nearby rigid surfaces. The present
work builds a fluid structure interaction numerical model based on structural–acoustic coupling, checks
the numerical model’s accuracy, and determines its capability to predict natural frequencies reduction
due to nearby rigid surfaces comparing this model against experimental data of submerged cantilever
plates. It is found that the structural–acoustical model can accurately predict the natural frequencies
for submerged structures with nearby rigid surfaces with averaged absolute errors of 2.5%. This is an
interesting result because it suggests that simulation of runners and impellers can be carried out considering
the effect of hydraulic seals, therefore, obtaining natural frequencies that are closer to those found
under operation.
CitacióRodríguez, C. [et al.]. Capability of structural-acoustical FSI numerical model to predict natural frequencies of submerged structures with nearby rigid surfaces. "Computers and fluids", 01 Juliol 2012, vol. 64, p. 117-126.
ISSN0045-7930
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