20.500.12556/RUL-137769 Simulation of macrosegregation in direct-chill casting a model based on meshless diffuse approximate method A multiphysics numerical model has been developed for prediction of macrosegregation in direct-chill casting. The model uses volume averaged mass, momentum, energy, and species conservation equations to simulate the solidification of axisymmetric aluminium-alloy billets. The boundary conditions for the heat transfer include the effects of hot top, mould chill, and direct chill. The volume averaged conservation equations are solved with the explicit local meshless diffuse-approximate method. The approximation coefficients are evaluated on subdomains containing 14 nodes with the second order polynomial basis and the Gaussian weight function. Problems with instabilities due to strong convection are successfully eliminated with an adaptive shift of the weight function and evaluation position in the upstream direction. The automatic adaptive generation of computational node arrangement decreases the calculation time and in a straightforward way enables investigation of the complex flow for geometrically different inflow structures, including sharp and curved edges. The model is used for casting simulation of an Al-5.25wt%Cu alloy billet with a 120 mm radius for various inlet designs. The effect of inlet geometry on the temperature, solid fraction, melt flow, and macrosegregation is investigated. The described developments represent a first meshless numerical approach for simulation of macrosegregation of an important industrial process. direct-chill casting macrosegregation meshless methods diffuse-approximate method inlet design realistic geometry solidification polkontinuirano ulivanje makroizcejanje brezmrežne metode metoda difuzijskih približkov vtočna oblika realistična geometrija strjevanje true false true Angleški jezik Slovenski jezik Članek v reviji 2022-06-30 09:54:34 2022-06-30 09:54:37 2022-09-15 04:15:47 0000-00-00 00:00:00 2020 0 0 Str. 191-203 Vol. 113 Apr. 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.7(045) 0955-7997 10.1016/j.enganabound.2019.12.006 17024283 1-s2.0-S0955799719306678-main.pdf 1-s2.0-S0955799719306678-main.pdf 1 3366AEBBB6598AE5E5C808A9C5AAADDD f74edf967b92464a2d3ae82d60bfd1df0f2e14fa7b15dd75e8cb3196ccaaa2e8 1c59cc09-f84a-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=157835 https://www.sciencedirect.com/science/article/pii/S0955799719306678 1 aeff7525-f849-11ec-8aca-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=157834 Fakulteta za strojništvo 0 0 0