Author(s)

M. Ramsak & L. Skerget

Abstract

The basic idea of mixed elements is the use of a continuous interpolation polynomial for conservative field function approximation and discontinu- ous interpolation polynomial for its normal derivative along the boundary element. In this manner, the advantages of continuous field function ap- proximation are retained and its conservation is preserved while the normal flux values are approximated by interpolation nodal points with uniquely defined normal direction. Due to the use of Mixed Boundary Elements the final discretised matrix system is over-determined and an iterative solver based on the Least Squares Method for sparse matrices is applied. Driven cavity results at Re = 100,400 and 1000 agree better with benchmark so- lution than FIDAP or TASCflow results for the

Keywords