تخمین ارتفاع غوطه وری جریان غلیظ با استفاده از مدل تلاطمی Re-Normalized Group

t When the density current smashes into the lower dense fluid mass a plunge region will occur. Since the plunge depth bounds between density current and ambient fluid, determining of this point is important. In this research, the hydraulic parameters of density current and bed slope of stagnant fluid were investigated. To achieve the purpose of this research a physical model was built in the hydraulic laboratory of Shahid Chamran University (SCU) and various experiments were performed. In the experiments, the plunge depth at the different discharge of density current and density difference ۶, ۹, ۱۳ and ۱۶ kg/m۳ at three slopes ۸, ۱۲ and ۱۶% was measured. Then using Flow-۳D under RNG turbulence model, plunge depth was simulated for the same experimental condition. The comparison of results obtained showed that the predicted plunge depth with Flow-۳D under RNG turbulence model had a high and satisfactory accuracy. Finding showed  that for the ۸% bed slope, the results of RNG turbulence model ۱۴% was more than experimental data. While, for the entire slope, the results of RNG turbulence model was predicted ۱۰.۵% in average more than measured data. Generally, the statistical investigations showed that the RNG turbulence model with satisfactory precision estimated the plunge point depth.

کلیدواژه ها:

ارتفاع غوطه وری ، شبیه سازی ، شیب بستر ، مدل تلاطمی RNG