An automatic mesh adaptation algorithm and its performance for simulation of flow over a circular cylinder at Re = 1.4 × 105 Online publication date: Sat, 24-May-2014
by Sayan Kaennakham; Moji Moatamedi
International Journal of Computational Science and Engineering (IJCSE), Vol. 9, No. 3, 2014
Abstract: The first objective of this study is to demonstrate how beneficial an automatic grid adaptation algorithm can be when applied with four two-equation turbulence models. For this, a simple mesh adaptation algorithm is constructed and tested with the flow over a circular cylinder at sub-critical regime with Re = 1.4 × 105. Its effectiveness is judged using three components; accuracy level, simplicity to use, and CPU affordability. The use of algorithm reveals a satisfactory solution with visible improvement in accuracy level when compared to fixed mesh. The most appealing feature of this algorithm is the significant reduction in CPU requirement indicating its potential one can achieve. Secondly, an investigation on evaluation of the four turbulence models, k - ε (RNG), k - ε (realisable), k - ω (standard), k - ω (SST), for this type of flow is also conducted. The results show that both models in k - ω category better predict the flow mechanism.
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