Numerical Schemes For Stabilisation, A Case Study Of The Flow Around A Cubic Building

• Main Author: Perpustakaan UGM, i-lib
• Format: Article NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 2003
• Subjects: Jurnal i-lib UGM
• Online Access: https://repository.ugm.ac.id/18479/; http://i-lib.ugm.ac.id/jurnal/download.php?dataId=1268
• Institution: Universitas Gadjah Mada

This study compares the performance of several numerical schemes to stabilise the iteration procedure while using a commercial package CFX, based on finite volume method We propose the use of low values of k and E combined with multi-blocks grids in this study since it proves to reduce the over-estimation of the production term of turbulent kinetic energy while using a standard k-e turbulence model. The use of the Van Leer scheme is suggested when applied coarse grids, since it will control the energy transport by diffusion. In general flow problems with high Reynolds number, this scheme also minimize the truncation and round-off errors. In conclusion, a combination of low k-e values and Van Leer schemes reduces the overestimation of k-c turbulence models and the number of iterations, which indicating the reduction of CPU time. Therefore, we note that using smaller k-e values does not only improve the turbulent viscosity correction but also improves the accuracy of the results, therefore, it can be applied in order to improve the performance of commercial package. Keywords: Numerical schemes, Turbulence models, Building