The methodology for 3d industrial sph modelling

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Unformatted text preview: hodology for 3D industrial SPH modelling involves the CAD specification of die geometry, the construction of FEM meshes using comercial mesh generators and the conversion of this to SPH input data. The difficulty associated with visualisation of complex 3D free surface flows using nonstructured particle data were also highlighted. The two examples demonstrate the complex 3D flow patterns in the die filling process. The complex free surface behaviour include splashing and surface breakup are handled naturally by SPH. This results from the Lagrangian nature of SPH and the superior mass conservation properties of this particle method. ACKNOWLEDGEMENTS This project is funded by the Cooperative Research Centre for Alloy and Solidification Technology (CAST). REFERENCES CLEARY, P.W. and HA, J., (1998), “SPH modelling of isothermal high pressure die casting”, Proc. 13th Australasian Fluid Mechanics Conference, Melbourne, Australia, December 663-666. CLEARY, P.W., HA, J. and AHUJA, V., (1999), “High pressure die casting using smoothed particle hydrodynamics”, Int. J. Cast Metal Res., in press. CLEARY, P.W. and MONAGHAN, J.J., (1993), “Boundary interactions and transition to turbulence for standard CFD problems using SPH”, Proc. 6th International Computational Techniques and Applications Conference, Eds. Stewart, D., Gardener, H., and Singleton, D., Canberra ACT, pp. 157. HA, J., CLEARY, P. and AHUJA, V., (1998), “Comparison of SPH Simulation of High Speed Die Filling with Experiment”, Proc. 13th Australasian Fluid Mechanics Conference, Melbourne, Australia, December 901-904. HA, J. and CLEARY, P., (1999), Comparison of SPH simulations of High Pressure Die Casting with the experiments and VOF simulations of Schmid and Klein, Int. J. Cast Metals Res., submitted. HOCKNEY, R.W. and EASTWOOD, J.W., (1988), “Computer Simulation Using Particles”, Institute of Physics Publishing Ltd. MONAGHAN, J.J., (1992), “Smoothed particle hydrodynamics”, Ann. Rev. Astron. Astrophys., 30, 543574. MONAGHAN, J.J., (1994), “Simulating free surface flows with SPH”, J. Comp. Phys., 110, 399-406. MONAGHAN, J.J., (1995), “Improved modelling of boundaries”, SPH Technical Note #2, CSIRO Division of Mathematics and Statistics, Technical Report DMS - C 95/86. Figure 6: Liquid metal surface when the die cavity is partially filled using a rectangular grid for surface visualisation. 440 Figure 2: Two perspective views of the filling of the C-shaped mould. The particles are coloured by velocity with red being 60 m/s and dark blue being stationary. Left: xy-plane. Right: xz-plane. 441 Figure 4: Two perspective views of the filling process at three times, as indicated. The particles are coloured by velocity with red being 60 m/s and dark blue being stationary. 442...
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