Mirko Javurek, Raimund Wincor,
"Vergleich von instationären Stranggusssimulationen mit FLUENT und PIV-Messungen"
: ANSYS Conference & 25. CADFEM Users' Meeting, 2007
Vergleich von instationären Stranggusssimulationen mit FLUENT und PIV-Messungen
Sprache des Titels:
ANSYS Conference & 25. CADFEM Users' Meeting
The turbulent flow of the liquid steel in the tundish and the strand of a slab strand caster are investiga-ted by PIV-measurements on corresponding water-models. The results are compared to FLUENT-simulations solving the unsteady Reynolds-averaged Navier-Stokes equations (URANS). Different methods for the comparisons are applied: not only the time-averaged results are compared, but also different flow patterns that develop during the transient fluctuations as well as time-signals of velocities in several points, jet positions and representative integrated velocities over cross sections are com-pared. The comparisons show that the flow patterns are well represented by the simulation in areas where there are well defined flow conditions (e.g. jet from inlet nozzle). In other areas, self induced fluctuations of the flow become larger, and the differences between measured and calculated veloci-ties can become quite significant even though the basic flow patterns of the simulations are qualita-tively right. The time-dependant comparisons show that the simulation predicts fluctuations with too narrow frequency bands – the real fluctuations are more chaotic. According to simulations, cutting the liquid volume of the strand after 2 m as it is done in the water model (and in many simulations) signifi-cantly restricts the flow fluctuations in the middle part of the strand. The same effect has to be ex-pected if symmetry conditions are used.