Turbulence-droplet interaction modelled by One-Dimensional-Turbulence

Licentiate thesis, 2017

A stochastic model to study droplet/particle influence on the gas phase using the One-Dimensional-Turbulence model (ODT) is evaluated. To address one of the major problems for multiphase flow simulations, namely computational costs, the dimension-reduced model is used with the goal of predicting certain classes of these flows more efficiently. ODT is a stochastic model simulating turbulent flow evolution along a notional one-dimensional line of sight by applying instantaneous maps which represent the effect of individual turbulent eddies on property fields. A Lagrangian particle tracking method developed by Schmidt et al. was modified and extended. For validation purposes flow configurations of turbulent particle-laden round jet were simulated with the developed model. It could be shown that the model has the capability to capture the impact of varying Stokes numbers and also different particle loadings. This shows that turbulence modulation is possible to capture with the model and it can be used for investigations of turbulent-droplet interaction at parameter ranges which are not accesible by DNS or LES simulations.