Direct numerical simulations of transverse and spanwise magnetic field effects on turbulent flow in a 2:1 aspect ratio rectangular duct

R. Chaudhary, A. F. Shinn, Surya Pratap Vanka, B. G. Thomas

Research output: Contribution to journalArticle

Abstract

Magnetic fields are used extensively to direct liquid metal flows in material processing. Continuous casting of steel uses different configurations of magnetic fields to optimize turbulent flows in rectangular cross-sections to minimize defects in the solidified steel product. Realizing the importance of a magnetic field on turbulent flows in rectangular cross-sections, the present work is aimed at understanding the effect of a magnetic field on the turbulent metal flow at a nominal bulk Reynolds number of ∼5300 (based upon full duct height) (Re. τ= 170, based upon half duct height) and Hartmann numbers (based upon half duct height) of 0, 6.0 and 8.25 in a 2:1 aspect ratio rectangular duct. Direct numerical simulations in a non-MHD 2:1 aspect ratio duct followed by simulations with transverse and span-wise magnetic fields have been performed with 224 × 120 × 512 cells (∼13.7 million cells). The fractional step method with second order space and time discretization schemes has been used to solve the coupled Navier-Stokes-MHD equations. Instantaneous and time-averaged natures of the flow have been examined through distribution of velocities, various turbulence parameters and budget terms. Spanwise (horizontal) magnetic field reorganizes and suppresses secondary flows more strongly. Turbulence suppression and velocity flattening effects are stronger with transverse (vertical) magnetic field.

Original languageEnglish (US)
Pages (from-to)100-114
Number of pages15
JournalComputers and Fluids
Volume51
Issue number1
DOIs
StatePublished - Dec 15 2011

Fingerprint

Magnetic field effects
Direct numerical simulation
Ducts
Turbulent flow
Aspect ratio
Magnetic fields
Turbulence
Steel
Secondary flow
Continuous casting
Magnetohydrodynamics
Liquid metals
Reynolds number
Defects
Processing
Metals

Keywords

  • DNS
  • MHD
  • Rectangular duct
  • Turbulent flow

ASJC Scopus subject areas

  • Computer Science(all)
  • Engineering(all)

Cite this

Direct numerical simulations of transverse and spanwise magnetic field effects on turbulent flow in a 2:1 aspect ratio rectangular duct. / Chaudhary, R.; Shinn, A. F.; Vanka, Surya Pratap; Thomas, B. G.

In: Computers and Fluids, Vol. 51, No. 1, 15.12.2011, p. 100-114.

Research output: Contribution to journalArticle

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