Vynnycky_2021_Determining.pdf (1.11 MB)
On determining the critical velocity in the shot sleeve of a high-pressure die casting machine using open source CFD
journal contributionposted on 2023-01-10, 12:39 authored by Sebastian Kohlstädt, MICHAEL VYNNYCKYMICHAEL VYNNYCKY, Stephan Goeke, Andreas Gebauer-Teichmann
This paper investigates the critical plunger velocity in high-pressure die casting during the slow phase of the piston motion and how it can be determined with computational fluid dynamics (CFD) in open source software. The melt-air system is modelled via an Eulerian volume-of-fluid approach, treating the air as a compressible perfect gas. The turbulence is treated via a Reynold saveraged Navier Stokes (RANS) approach that uses the Menter SST k-w model. Two different strategies for mesh motion are presented and compared against each other. The solver is validated via analytical models and empirical data. A method is then presented to determine the optimal velocity using a two-dimensional (2D) mesh. As a second step, it is then discussed how the results are in line with those obtained for an actual, industrially relevant, three-dimensional (3D) geometry that also includes the ingate system of the die.
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- MACSI - Mathematics Application Consortium for Science & Industry
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- Mathematics & Statistics