Computational fluid dynamic simulation of a multiphase fluid in vertical flow at high reynolds number

Iffat T. Shaikmohammad, Deep Bandyopadhyay, Karuna S. Koppula, André Bénard, Charles A. Petty

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

Abstract

The objective of this work was to assess the performance of single-phase flow and two-phase turbulent flow models implemented in FLUENT 6.2 using experimental data and the realizability diagram for the Reynolds stress. The Reynolds stress must have positive or zero eigenvalues to be physical and the invariant diagram bounds the region corresponding such eigenvalues. The various turbulence models applied in the single phase flow simulations proved to be realizable except for the Spalart-Allmaras model (Spalart et al., 1992) which showed to be unrealizable at various locations. Moreover, the Realizable k-ε model (Shih et al., 1995), which was realizable for single-phase flows, became unrealizable for the primary phase in the two-phase flow simulations. It is unclear if the inaccuracies arise due the numerical implementation or the coupling of the granular model with the turbulence model. In addition, the gas-solid flow model was not able to predict the right order of pressure drop across the riser. Also, the predicted time averaged profiles of the axial and span wise particle velocities showed poor agreement with the experimental findings (Ibsen et al., 2001) The gas-solid flow numerical model does not appear to be capable of predicting the correct interaction of the turbulent gas phase and particles. It was observed that the dispersion of the secondary phase is under predicted and the numerical results did not predict a dense bottom bed as seen in the experimental set-up.

LanguageEnglish (US)
Title of host publicationAIChE Annual Meeting, Conference Proceedings
StatePublished - 2006
Event2006 AIChE Annual Meeting - San Francisco, CA, United States
Duration: Nov 12 2006Nov 17 2006

Other

Other2006 AIChE Annual Meeting
CountryUnited States
CitySan Francisco, CA
Period11/12/0611/17/06

Profile

Computational fluid dynamics
Reynolds number
Fluids
Computer simulation
Flow of solids
Gases
Flow simulation
Turbulence models
Two phase flow
Turbulent flow
Pressure drop
Numerical models

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Shaikmohammad, I. T., Bandyopadhyay, D., Koppula, K. S., Bénard, A., & Petty, C. A. (2006). Computational fluid dynamic simulation of a multiphase fluid in vertical flow at high reynolds number. In AIChE Annual Meeting, Conference Proceedings

Computational fluid dynamic simulation of a multiphase fluid in vertical flow at high reynolds number. / Shaikmohammad, Iffat T.; Bandyopadhyay, Deep; Koppula, Karuna S.; Bénard, André; Petty, Charles A.

AIChE Annual Meeting, Conference Proceedings. 2006.

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

Shaikmohammad, IT, Bandyopadhyay, D, Koppula, KS, Bénard, A & Petty, CA 2006, Computational fluid dynamic simulation of a multiphase fluid in vertical flow at high reynolds number. in AIChE Annual Meeting, Conference Proceedings. 2006 AIChE Annual Meeting, San Francisco, CA, United States, 11/12/06.
Shaikmohammad IT, Bandyopadhyay D, Koppula KS, Bénard A, Petty CA. Computational fluid dynamic simulation of a multiphase fluid in vertical flow at high reynolds number. In AIChE Annual Meeting, Conference Proceedings. 2006.
Shaikmohammad, Iffat T. ; Bandyopadhyay, Deep ; Koppula, Karuna S. ; Bénard, André ; Petty, Charles A./ Computational fluid dynamic simulation of a multiphase fluid in vertical flow at high reynolds number. AIChE Annual Meeting, Conference Proceedings. 2006.
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AB - The objective of this work was to assess the performance of single-phase flow and two-phase turbulent flow models implemented in FLUENT 6.2 using experimental data and the realizability diagram for the Reynolds stress. The Reynolds stress must have positive or zero eigenvalues to be physical and the invariant diagram bounds the region corresponding such eigenvalues. The various turbulence models applied in the single phase flow simulations proved to be realizable except for the Spalart-Allmaras model (Spalart et al., 1992) which showed to be unrealizable at various locations. Moreover, the Realizable k-ε model (Shih et al., 1995), which was realizable for single-phase flows, became unrealizable for the primary phase in the two-phase flow simulations. It is unclear if the inaccuracies arise due the numerical implementation or the coupling of the granular model with the turbulence model. In addition, the gas-solid flow model was not able to predict the right order of pressure drop across the riser. Also, the predicted time averaged profiles of the axial and span wise particle velocities showed poor agreement with the experimental findings (Ibsen et al., 2001) The gas-solid flow numerical model does not appear to be capable of predicting the correct interaction of the turbulent gas phase and particles. It was observed that the dispersion of the secondary phase is under predicted and the numerical results did not predict a dense bottom bed as seen in the experimental set-up.

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