Numerical Evaluation of the Impact of Selected Physical Phenomena and Riser Shape on the Formation of Shrinkage Defects in the Casting-Riser System |
| L. Sowa, T. Skrzypczak
Department of Mechanics and Machine Design Fundamentals, Faculty of Mechanical Engineering and Computer Science, Czestochowa University of Technology, Dąbrowskiego 73, 42-201 Częstochowa, Poland |
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| Understanding the complex physical phenomena involved in the casting process simulation requires continuous and complementary research to improve mathematical modelling. The paper presents a mathematical model and numerical simulations of the solidification process of a cylindrical casting, taking into account the filling of the mould cavity with liquid metal and feeding the casting through the riser during solidification. The basic mathematical model that considers only thermal phenomena is often insufficient to analyse the metal solidification process. Therefore, more complex models are formulated that include coupled thermal and flow phenomena. The mathematical description then consists of the system of Navier-Stokes differential equations, the equations of the continuity of flow and energy. Such a mathematical model was used in the paper because the mutual dependence of thermal and flow phenomena has a significant impact on the solidification process. The finite element method was used to solve the problem, and changes in thermophysical parameters were considered as a function of temperature. The impact of the riser shape on the effectiveness of feeding of the solidifying casting was also determined and an appropriate selection of the riser shape was made to obtain a casting without shrinkage defects, which was the aim of this work. |
DOI:10.12693/APhysPolA.144.296 topics: numerical simulations, solidification, Navier-Stokes equations, casting defect |