Assessment of large eddy and RANS stirred tank simulations by means of LDA

H. Hartmann, J. J. Derksen, C. Montavon, J. Pearson, I. S. Hamill, H. E.A. van den Akker

Research output: Contribution to journalArticlepeer-review

Abstract

Large eddy simulations (LES) and Reynolds-averaged Navier-Stokes (RANS) calculations were performed on the flow in a baffled stirred tank, driven by a Rushton turbine at Re=7300. The LES methodology provides detailed flow information as velocity fluctuations are resolved down to the scale of the numerical grid. The Smagorinsky and Voke subgrid-scale models used in the LES were embedded in a numerical lattice-Boltzmann scheme for discretizing the Navier-Stokes equations, and an adaptive force-field technique was used for modeling the geometry. The uniform, cubic computational grid had a size of 2403 grid nodes. The RANS calculations were performed using the computational fluid dynamics code CFX 5.5.1. A transient sliding mesh procedure was applied in combination with the shear-stress-transport (SST) turbulence closure model. The mesh used for the RANS calculation consisted of 241464 nodes and 228096 elements (hexahedrons). Phase-averaged and phase-resolved flow field data, as well as turbulence characteristics, based on the LES and RANS results, are compared both mutually and with a single set of experimental data.

Original languageEnglish
Pages (from-to)2419-2432
Number of pages14
JournalChemical Engineering Science
Volume59
Issue number12
DOIs
Publication statusPublished - Jun 2004
Externally publishedYes

Keywords

  • Fluid dynamics
  • LDA
  • Mixing
  • Simulations
  • Stirred tank
  • Turbulence

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