9th ECCC European Continuous Casting Conference – ECCC 2017

In the recent study from the authors [1] a criterion is established for the near wall mesh treatment for simulating submerged entry nozzle (SEN) flows for the industrial applications. Fulfilling the criterion is found to crucial when it concerns a possible flow detachment (see Fig. 1) inside the continuous casting (CC) SEN. A numerical model, based on the RANS approach, matches the water modeling results quite well qualitatively, however a mismatch in the main jet oscillations frequency is detected as well as the magnitude of the submeniscus vortex is not predicted correctly. The possible reasons for the mismatch are (a) the lack of accuracy in the turbulence modelling and (b) exclusion of the free surface from the simulation. Thereby in the presented study a free surface is included into the numerical model along with a study devoted to different turbulence modelling approaches: (i) Scale Adaptive Simulation (SAS), (ii) Large Eddy Simulation (LES) and (ii) laminar “coarse-DNS” models are compared with the previously used one [1]. Additionally the comparison for the wall function approach with the near wall treatment method is done. The results are verified by the water modeling experiment including speed camera recording of the dye injections and the submeniscus velocities measurements. Keywords: Thin slab, turbulence, RANS, SAS, LES, coarse DNS, wall functions, water model Literature: [1] A. Vakhrushev, M. Wu, A. Ludwig, T. Holzmann, G. Nitzl, Y. Tang, G. Hackl. Establishing a numerical criterion to verify the RANS-type flow simulation in application to the continuous casting process // ESCO 2016, 5th European Seminar on Computing, June 5 - 10, 2016, Pilsen, Czech Republic