URANS simulation of continuous casting mold flow: Assessment of revised turbulence models


URANS simulation of continuous casting mold flow: Assessment of revised turbulence models

Kratzsch, C.; Timmel, K.; Eckert, S.; Schwarze, R.

A time-resolved numerical model of the mini-LIMMCAST facility is investigated in the frame of RANS simulations. Three revised eddy viscosity turbulence models besides the often used Standard k-epsilon model for steady and unsteady RANS simulations are evaluated with the CFD software tool OpenFOAM. The data is compared with experimental results focusing the jet flow[1]. Different turbulence models lead to slight deviations from the experimental data in the case of steady state calculation with first order accuracy. For the time-averaged URANS results a crucial in uence by the discretization order is observed. In case of unsteady results a mix between first and higher order accuracy schemes is necessary for representative results. The use of the Standard k-epsilon model and the Realizable k-epsilon model can lead to unstable behavior in the case of URANS simulations. Conclusively, the study shows, that in case of qualitative temporal resolved informations and temporal averaged results an unsteady RANS simulation can keep up with a LES.

Keywords: unsteady mold flow; RANS; URANS; OpenFOAM; mini-LIMMCAST

Permalink: https://www.hzdr.de/publications/Publ-20542
Publ.-Id: 20542