TY - JOUR
TI - A comparative study of variant turbulence modeling in the physical behaviors of diesel spray combustion
AU - Amini Behnaz
AU - Khaleghi Hasan
JN - Thermal Science
PY - 2011
VL - 15
IS - 4
SP - 1081
EP - 1093
PT - Article
AB - In this research, the performance of non-linear k-ε turbulence model in  resolving the time delay between mean flow changes and its proportionate  turbulent dissipation rate adjustment was investigated. For this purpose, the  ability of Launder-Spalding linear, Suga non-linear, Yakhot RNG and Rietz  modified RNG k-ε models are compared in the estimation of axial mean velocity  profile and turbulent integral length scale evolution during engine  compression stroke. Computed results showed that even though all the models  can predict the acceptable results for velocity profile, for turbulent  integral length scale curve, non-linear model is in a good agreement with  modified RNG model prediction that depicts correspondence with experimental  reported data, while other models show a different unrealistic behaviors.  Also after combustion starts and piston is expanding, non-linear model can  predicts actual manner for integral length scale while linear one cannot. It  is concluded that, physical behavior of turbulence models characteristics  should be ascertained before being successfully applied to simulate complex  flow fields like internal combustion engines.