Boltzmann methods 1 Coolants 1 Counter-rotating Vortex Pair Double row film cooling 1 Double rows 1 Film cooling 1 Flow structure 1 Forward and backward jet 1 Forward-and-backward 1 Kinetic theory 1 Mixing 1 Mixing mechanisms 1 Reynolds number 1 Simplified thermal boltzmann method 1 Thermal 1 Vortex flow 1 counterrotating vortex pair 1 double rows film cooling 1 forward and backward jets 1 mixing mechanism 1 simplified thermal Boltzmann method 1