Assessment of free surface/submerged vortical flow structures and gas entrainment at pump intakes using rans CFD

S. Pal, Andri Rizhakov, Michael P. Kinzel, Kelly J. Knight

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The assessment of liquid flow patterns forming due to a submerged pump intake, and its associated gas entrainment phenomena, need to be reliable and accurate for a number of design applications. The use of conservative correlations can lead to gross over-design or, inaccurate predictions in certain complex suction arrangements. Scale model testing often has scale effects which leads engineers to rely on other analysis methods. Simplified analyses can fail to correctly predict the vortical features near the suction intakes and associated gas entrainment, which may lead many applications to use Computational Fluid Dynamics (CFD) as a method for intake flow predictions. However, reliable assessment of gas entraining into a suction intake with high Reynolds number internal flow, involves several physical modeling and numerical challenges. An accurate assessment requires, (1) a transient model, (2) proper resolution in the wall boundary layers near the intakes, (3) resolution of the swirl in the vortical structures, and (4) modeling of the laminar-To-Turbulent transitional effects in the vicinity of the intake. This paper addresses and evaluates the performance of several turbulence model options and modifications within a CFD code for the assessment of intake flow. The results presented in this paper, are compared against published experimental data on vortical flow patterns at intakes, to identify physical and numerical modeling needs for such assessments. The results show that while, adequately resolved meshes, and low Reynolds number RANS (Reynolds Averaged Navier Stokes) turbulence models can capture the location and relative strength of vortices, the results for flow details inside the vortical structures identified need to be interpreted carefully, considering the relevant flow physics and modeling limitations. The turbulence model modifications proposed involve curvature correction and scale adaptiveness.

Original languageEnglish (US)
Title of host publicationASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012
Pages189-208
Number of pages20
EditionPARTS A, B, C, D
DOIs
StatePublished - Dec 1 2012
EventASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012 - Houston, TX, United States
Duration: Nov 9 2012Nov 15 2012

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
NumberPARTS A, B, C, D
Volume7

Other

OtherASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012
CountryUnited States
CityHouston, TX
Period11/9/1211/15/12

Fingerprint

Air entrainment
Flow structure
Turbulence models
Associated gas
Computational fluid dynamics
Pumps
Flow patterns
Reynolds number
Gases
Submersible pumps
Boundary layers
Vortex flow
Physics
Engineers
Liquids
Testing

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

Pal, S., Rizhakov, A., Kinzel, M. P., & Knight, K. J. (2012). Assessment of free surface/submerged vortical flow structures and gas entrainment at pump intakes using rans CFD. In ASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012 (PARTS A, B, C, D ed., pp. 189-208). (ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE); Vol. 7, No. PARTS A, B, C, D). https://doi.org/10.1115/IMECE2012-88079
Pal, S. ; Rizhakov, Andri ; Kinzel, Michael P. ; Knight, Kelly J. / Assessment of free surface/submerged vortical flow structures and gas entrainment at pump intakes using rans CFD. ASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012. PARTS A, B, C, D. ed. 2012. pp. 189-208 (ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE); PARTS A, B, C, D).
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Pal, S, Rizhakov, A, Kinzel, MP & Knight, KJ 2012, Assessment of free surface/submerged vortical flow structures and gas entrainment at pump intakes using rans CFD. in ASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012. PARTS A, B, C, D edn, ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE), no. PARTS A, B, C, D, vol. 7, pp. 189-208, ASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012, Houston, TX, United States, 11/9/12. https://doi.org/10.1115/IMECE2012-88079

Assessment of free surface/submerged vortical flow structures and gas entrainment at pump intakes using rans CFD. / Pal, S.; Rizhakov, Andri; Kinzel, Michael P.; Knight, Kelly J.

ASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012. PARTS A, B, C, D. ed. 2012. p. 189-208 (ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE); Vol. 7, No. PARTS A, B, C, D).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Pal S, Rizhakov A, Kinzel MP, Knight KJ. Assessment of free surface/submerged vortical flow structures and gas entrainment at pump intakes using rans CFD. In ASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012. PARTS A, B, C, D ed. 2012. p. 189-208. (ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE); PARTS A, B, C, D). https://doi.org/10.1115/IMECE2012-88079