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URANS Simulation of Continuous Casting Mold Flow: Assessment of Revised Turbulence Models
Author(s) -
Kratzsch Christoph,
Timmel Klaus,
Eckert Sven,
Schwarze Rüdiger
Publication year - 2015
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201400097
Subject(s) - reynolds averaged navier–stokes equations , turbulence , computational fluid dynamics , turbulence modeling , mechanics , large eddy simulation , discretization , k epsilon turbulence model , flow (mathematics) , k omega turbulence model , detached eddy simulation , physics , mathematics , mathematical analysis
A time resolving numerical model of single phase mold flows is formulated in the frame of Reynolds‐averaged Navier–Stokes (RANS) simulations. Three revised eddy viscosity turbulence models besides the often used Standard k – ϵ model for steady and unsteady RANS simulations are evaluated with the computational fluid dynamics (CFD) software tool OpenFOAM. The performance of the numerical model and the different turbulence models is tested with help of the mini‐LIMMCAST facility. Numerical data are compared with experimental results focusing especially on the jet flow region. The different turbulence models lead to slight deviations from the experimental data in the case of steady state calculation. For the time‐averaged unsteady RANS equations (URANS) results, a crucial influence by the discretization order is observed. In the case of unsteady results a mix between first and higher order accuracy schemes is necessary for representative results. The use of the Standard k – ϵ model and the RLZ k – ϵ model can lead to unstable behavior in the case of URANS simulations. The study concludes, that in the case of qualitative, temporally resolved informations, and temporally averaged results, an unsteady RANS simulation can keep up with a large eddy simulations (LES).