Transition Prediction

Simulation of turbulent flow in a rapid compression machine: Large Eddy Simulation and computationally efficient alternatives for the design of ignition delay time experiments

“…Solving all scale levels of turbulence and simulation of the whole transition process including the development of disturbance waves, interaction between waves and boundary layers, ignition of turbulent spots, laminar flow breakdown, and development into fully turbulent is only possible in DNS [24]. However, LES as an alternative method for DNS uses the concept of solving the large-scale eddies directly, and modelling the small eddies.…”

“…The subgrid-scale turbulence can be better modeled by accounting for the transport of the subgrid-scale turbulence kinetic energy [26]. This model is more appropriate for predicting the transition onset, because the sub-grid eddy viscosity is automatically reduced to zero in a laminar boundary layer [24]. Therefore, the dynamic subgrid-scale kinetic energy model (DKEM) in ANSYS Fluent v16.0 based on the model proposed by Kim and Menon [27] and Kim [26] is used in this study.…”