EPTT 2022

13th Spring School on Transition and Turbulence

Performance of RANS-based turbulence models on a square-section, hydrofoil impeller driven, stirred tank

Submission Author: Eduard Rubens Schacht Sasse , SC
Co-Authors: Eduard Rubens Schacht Sasse, Alessandra Letícia Longhi, Celso Murilo dos Santos, Jonathan Utzig, Henry França Meier
Presenter: Eduard Rubens Schacht Sasse

doi://10.26678/ABCM.EPTT2022.EPT22-0087

 

Abstract

The vigorous, swirling flow induced by mechanical mixing stirrers renders them a CFD modelling challenge. Aiming the numerical validation of the single-phase flow in a square-section tank agitated by a broad blade hydrofoil-type impeller, multiple RANS-based turbulence models are evaluated, – namely, standard k-ε, k-ε Realizable, k-ε RNG, k-ω, SST and Reynolds-Stress Model. The solution is verified against experimental data. A further comparison is made between power derived from rotor torque and energy dissipated in the fluid to assess the cross consistency of the simulation. GCI method is applied to estimate the numerical uncertainty associated with grid coarseness. The presented work is preliminary for simulating multiphase gas dispersion systems. It is expected for k-ε Realizable closure to provide the best compromise between computational effort and accuracy following the findings of previous studies on stirred tanks.

Keywords

RANS, Turbomachinery, Turbulence Models, Turbulent flow, Mixing

 

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