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Research Papers: Techniques and Procedures

A Thin Film Fluid Structure Interaction Model for the Study of Flexible Structure Dynamics in Centrifugal Pumps

[+] Author and Article Information
A. Albadawi

School of Mechanical and
Manufacturing Engineering,
Dublin City University,
Glasnevin,
Dublin D9, Ireland
e-mail: abdulaleem.albadawi@sulzer.com

M. Specklin

Sulzer Pump Solutions Ireland Ltd.,
School of Mechanical and
Manufacturing Engineering,
Dublin City University,
Glasnevin,
Dublin D9, Ireland
e-mail: mathieu.specklin2@mail.dcu.ie

R. Connolly

Global Technology,
Pumps Equipment,
Sulzer Pump Solutions Ireland Ltd.,
Clonard Road,
Wexford Y35 YE24, Ireland
e-mail: abdulaleem.albadawi@sulzer.com

Y. Delauré

School of Mechanical and
Manufacturing Engineering,
Dublin City University,
Glasnevin,
Dublin D9, Ireland
e-mail: yan.delaure@dcu.ie

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received May 15, 2018; final manuscript received October 15, 2018; published online December 10, 2018. Assoc. Editor: Elias Balaras.

J. Fluids Eng 141(6), 061402 (Dec 10, 2018) (11 pages) Paper No: FE-18-1341; doi: 10.1115/1.4041759 History: Received May 15, 2018; Revised October 15, 2018

This paper describes a fluid-structure interaction (FSI) model for the study of flexible cloth-like structures or the so-called rags in flows through centrifugal pumps. The structural model and its coupling to the flow solver are based on a Lagrangian formulation combining structural deformation and motion modeling coupled to a sharp interface immersed boundary model (IBM). The solution has been implemented in the open-source library OpenFOAM relying in particular on its PIMPLE segregated Navier–Stokes pressure–velocity coupling and its detached eddy simulation (DES) turbulence model. The FSI solver is assessed in terms of its capability to generate consistent deformations and transport of the immersed flexible structures. Two benchmark cases are covered and both involve experimental validation with three-dimensional (3D) structural deformations of the rag captured using a digital image correlation (DIC) technique. Simulations of a rag transported in a centrifugal pump confirm the suitability of the model to inform on the dynamic behavior of immersed structures under practical engineering conditions.

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Figures

Grahic Jump Location
Fig. 1

Schematic of the pendulum rig

Grahic Jump Location
Fig. 2

Time history of the free edge center point displacement in the normal direction

Grahic Jump Location
Fig. 3

Time history of the free edge center point displacement in the longitudinal direction

Grahic Jump Location
Fig. 4

Snapshots of the rag superimposed on contour plot of flow velocity magnitude from numerical simulations

Grahic Jump Location
Fig. 5

Schematic diagram of the water tunnel and DIC measurement system

Grahic Jump Location
Fig. 6

Transported rag shown with contour plot of transverse displacement obtained by DIC (experimental tests). The flagpole is visible on the left. The nondimension time t* is shown on each frame.

Grahic Jump Location
Fig. 7

Comparison between the experimental and numerical motion of the centroid of the rag's upstream edge: displacements of a Lagrangian solid point in the streamwise direction x (top) and streamwise velocity component of the corresponding point (bottom)

Grahic Jump Location
Fig. 8

Comparison between the experimental and numerical motion of the centroid of the rag's upstream edge: displacements of a Lagrangian solid point in the vertical direction y (top) and vertical velocity component of the corresponding point (bottom)

Grahic Jump Location
Fig. 9

Surface meshes for IBM model: (left) single-blade impeller and (right) two-blade impeller

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Fig. 10

Head and torque versus flow rates for the single-blade impeller pump. All data are normalized by the experimental head and torque at the BEP. Experimental data are provided by Sulzer.

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Fig. 11

Head and torque versus flow rates for the two-blade impeller pump. All data are normalized by the experimental head and torque at the BEP. Experimental data are provided by Sulzer.

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Fig. 12

Visualization of the deformed rag surface at eight successive times after the release for Q/QBEP = 1. The cross section of the pump volute and impeller is shown in gray.

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Fig. 13

Visualization of the deformed rag surface at eight successive times after the release for Q/QBEP = 0.36. The cross section of the pump volute and impeller is shown in gray.

Grahic Jump Location
Fig. 14

Visualization of the rag (shown in red) as it wraps itself around the impeller (shown in blue): square 10 cm × 10 cm rag at Q/QBEP = 1 (top), rectangular 15 cm × 5 cm rag at Q/QBEP = 1 (middle), and rectangular 15 cm × 5 cm rag at Q/QBEP = 0.36 (bottom)

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