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Research Papers: Flows in Complex Systems

Lattice Boltzmann Simulation of the Flow Field in Pump Intakes—A New Approach

[+] Author and Article Information
Andreas Schneider

Chair of Fluid Mechanics and Fluid Machinery
Department of Mechanical
and Process Engineering,
Technische Universität Kaiserslautern,
Gottlieb Daimler Straße,
Kaiserslautern 67663, Germany
e-mail: andreas.schneider@mv.uni-kl.de

Daniel Conrad

Chair of Fluid Mechanics and Fluid Machinery
Department of Mechanical
and Process Engineering,
Technische Universität Kaiserslautern,
Gottlieb Daimler Straße,
Kaiserslautern 67663, Germany
e-mail: daniel.conrad@mv.uni-kl.de

Martin Böhle

Professor
Chair of Fluid Mechanics and Fluid Machinery
Department of Mechanical
and Process Engineering,
Technische Universität Kaiserslautern,
Gottlieb Daimler Straße,
Kaiserslautern 67663, Germany
e-mail: martin.boehle@mv.uni-kl.de

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received September 12, 2013; final manuscript received October 7, 2014; published online December 3, 2014. Assoc. Editor: Zhongquan Charlie Zheng.

J. Fluids Eng 137(3), 031105 (Mar 01, 2015) (10 pages) Paper No: FE-13-1549; doi: 10.1115/1.4028777 History: Received September 12, 2013; Revised October 07, 2014; Online December 03, 2014

In recent years, lattice Boltzmann methods (LBMs) have become popular for solving fluid flow problems of engineering interest. Reasons for this popularity are due to the advantages of this method, which are, for example, the simplicity to handle complex geometries and the high efficiency in calculating transient flows. For the operational reliability and efficiency of pumps and pump systems, the incoming flow conditions are crucial. Since the efficiency and reliability requirements of pumps are rising and must be guaranteed by the pump and plant manufacturer, the flow conditions in pump intakes need to be evaluated during plant design. Recent trends show that pump intakes are built more and more compact, what makes the flow in the intake even more complex and holds a higher risk for unacceptable pump inflow conditions. In this contribution, a numerical scheme for the simulation of pump intake flows based on a lattice Boltzmann-large eddy simulation (LES) approach is presented and the ability of the method to capture the flow phenomena in intake flows is analyzed. Special attention is turned to the potential of the numerical scheme to reproduce the transient vortex behavior of intake flows, which results in a very complex flow structure and is challenging to model numerically.

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Figures

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Fig. 1

Pump intake geometry and main geometrical parameter

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Fig. 2

Classification of free surface vortices [2]

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Fig. 3

Classification of subsurface vortices [2]

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Fig. 5

Fluid domain for turbulent channel flow

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Fig. 6

Sectional view of the mesh

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Fig. 7

Mean velocity profile

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Fig. 8

Velocity fluctuation profiles

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Fig. 9

Meandering and intermittency of free surface vortex at OP1

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Fig. 10

Comparison of free surface vortex locations at OP1

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Fig. 11

Time averaged vortex structures: Q-criterion at OP1

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Fig. 12

Time averaged surface streamlines at OP1

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Fig. 13

PIV measurement line

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Fig. 14

Comparison of x-velocity component at OP1

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Fig. 15

Comparison of y-velocity component at OP1

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Fig. 16

Comparison of z-velocity component at OP1

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Fig. 17

Comparison of x-velocity component for all operating points

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Fig. 18

Comparison of y-velocity component for all operating points

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Fig. 19

Comparison of z-velocity component for all operating points

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