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Technical Brief

On the Capability of Structural–Acoustical Fluid–Structure Interaction Simulations to Predict Natural Frequencies of Rotating Disklike Structures Submerged in a Heavy Fluid

[+] Author and Article Information
David Valentín

Centre for Industrial Diagnostics and
Fluid Dynamics,
Polytechnic University of Catalonia,
ETSEIB,
Av. Diagonal, 647,
Barcelona 08028, Spain
e-mail: david.valentin@mf.upc.edu

Alexandre Presas

Centre for Industrial Diagnostics and
Fluid Dynamics,
Polytechnic University of Catalonia,
ETSEIB,
Av. Diagonal, 647,
Barcelona 08028, Spain
e-mail: alex.presas@mf.upc.edu

Eduard Egusquiza

Centre for Industrial Diagnostics and
Fluid Dynamics,
Polytechnic University of Catalonia,
ETSEIB,
Av. Diagonal, 647,
Barcelona 08028, Spain
e-mail: egusquiza@mf.upc.edu

Carme Valero

Centre for Industrial Diagnostics and
Fluid Dynamics,
Polytechnic University of Catalonia,
ETSEIB,
Av. Diagonal, 647,
Barcelona 08028, Spain
e-mail: valero@mf.upc.edu

1Corresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received October 21, 2015; final manuscript received January 18, 2016; published online April 13, 2016. Assoc. Editor: Patrick S. Keogh.

J. Vib. Acoust 138(3), 034502 (Apr 13, 2016) (6 pages) Paper No: VIB-15-1449; doi: 10.1115/1.4032726 History: Received October 21, 2015; Revised January 18, 2016

Predicting natural frequencies of rotating disklike structures submerged in water is of paramount importance in the field of hydraulic machinery, since the dynamic response of disks presents similarities to the dynamic response of pump-turbine runners. Well-known computational methods, such as structural-acoustical fluid–structure interaction (FSI) simulations, are perfectly capable to predict the added mass effects of standing submerged disks. However, the capability of these simulations to predict the effect of rotation in the natural frequencies of submerged disks has not been investigated. To obtain adequate results, the relationship between the disk rotation and the fluid rotation has to be introduced in the simulation model to consider the effects of the surrounding flow and the transmission within rotating and stationary frame. This procedure is explained and discussed in this technical brief comparing analytical, numerical, and experimental results.

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References

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Figures

Grahic Jump Location
Fig. 2

Modulation of natural frequencies for different values of rotating speed of the disk and fluid with different surrounding fluid density (n = 2)

Grahic Jump Location
Fig. 3

Natural frequencies' relationship between references frames for a rotating disk submerged in a fluid (n = 2)

Grahic Jump Location
Fig. 4

Mesh detail and boundary conditions of the FEM model

Grahic Jump Location
Fig. 5

Natural frequencies modulation against the rotating speed of the disk: (a) n = 2, (b) n = 3, and (c) n = 4

Grahic Jump Location
Fig. 6

Mode-shapes animation during a quarter of rotating period (T/4). Counterclockwise rotating direction of the disk.

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