Mould filling simulation with cut cell in Cartesian grid system

Authors: Choi, Y. S.; Hong, J.-H.; Hwang, H.-Y.; Choi, J.-K.

Source: International Journal of Cast Metals Research, Volume 21, Numbers 1-4, August 2008 , pp. 334-337(4)

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Abstract:

Cartesian grid system has mainly been used in the casting simulation even though it does not nicely represent sloped and curved surfaces. These distorted boundaries cause several problems. A special treatment is necessary to clear these problems. A cut cell method on Cartesian grids has been developed to simulate three-dimensional mould filling. Cut cells at a cast/mould interface are generated on Cartesian grids. Governing equations were computed using volume and areas of cast at cut cells.

In this paper, a new method that can consider the cutting cells which are cut by casting and mould based on the partial cell treatment is proposed. This method provides a better representation of geometry surface and will be used in the computation of velocities that are defined on the cell boundaries in the Cartesian gird system. Various test examples for several casting process were computed and validated. The analysis results of more accurate fluid flow pattern and less momentum loss owing to the stepped boundaries in the Cartesian grid system were confirmed. It can be known that the momentum energy at the cut cell is conserved by using the cut cell method. By using the cut cell method, the performance of computation gets better because of reducing the whole number of meshes.

Keywords: COMPUTATIONAL FLUID DYNAMICS; BODY FITTED COORDINATE SYSTEM; CARTESIAN GRIDS SYSTEM; CUT CELL; MOMENTUM LOSS

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/136404608X362205

Publication date: 2008-08-01

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