Analysis of Inverse-Prandtl of Dissipation in Standard k-? Turbulence Model for Predicting Flow Field of Crossflow Wind Turbine

Gun Gun R  Gunadi; Ahmad Indra  Siswantara; Budiarso Budiarso; Hariyotejo  Pujowidodo; Candra Damis  Widiawaty; Dendy  Adanta

Authors

Gun Gun R Gunadi Department of Mechanical Engineering, Politeknik Negeri Jakarta, Depok 16424, Indonesia
Ahmad Indra Siswantara Department of Mechanical Engineering, Faculty of Engineering, Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia
Budiarso Budiarso Department of Mechanical Engineering, Faculty of Engineering, Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia
Hariyotejo Pujowidodo Center for Thermodynamics, Engine, and Propulsion, BPPT, Serpong, Tanggerang Selatan 15314, Indonesia
Candra Damis Widiawaty Department of Mechanical Engineering, Politeknik Negeri Jakarta, Depok 16424, Indonesia
Dendy Adanta Department of Mechanical Engineering, Faculty of Engineering, Universitas Sriwijaya, Indralaya 30662, South Sumatera, Indonesia

Keywords:

crossflow wind turbine, CFD, standard kε, turbulent model, inverse-Prandtl of dissipation

Abstract

The analysis of the turbulence model on turbulent flow in certain objects is important to optimize the numerical simulation. To simulate rotating flow in crossflow turbine, the numerical accuracy of the Renormalization Group (RNG) k-? model has better results than the standard k-? model. To improve predictions of the standard k-? turbulent model can be done by adjusting the constant value. This study discusses the effect of constant inverse-Prandtl number in dissipation equation (?e) on the standard k-? turbulent model toward the prediction of the flow field. Case studies of the effect of ?e constant on flow field prediction were carried out in crossflow wind turbines. The ?e constant values examined are 1, 1.2, 1.4 and 1.5. Based on the results, there is a significant influence on the flow field prediction in a crossflow wind turbine. This shows that to improve the prediction of the standard k-? turbulent model can be done by testing the ?e constant values.