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The liquid jet exiting into a gas is an issue of great interest with many applications such as jet cutting, fuel injection, or firefighting. To simulate the breakup correctly, the simulation of the whole liquid jet starting with the channel or pipe flow, the nonbreaking and the breaking part of the jet up to the final breakup has to be simulated accurately. Due to the limitation of direct numerical simulations (DNS) to moderate Reynolds numbers (Re), a stochastic 1D ansatz based on the one-dimensional turbulence (ODT) model is used to simulate a rectangular liquid jet with a high lateral resolution. ODT permits an affordable high resolution of interface and single phase property gradients, which are key for understanding the local behaviour. ODT is a stochastic model simulating turbulent flow evolution along a notional 1D line of sight by applying instantaneous maps to represent the effect of individual turbulent eddies on property profiles. The occurrence of an eddy itself is affected by the property profiles, resulting in self-contained flow evolution that obeys the applicable conservation laws. Results are based on an ensemble average of several realizations. A detailed introduction is given by Kerstein [3] and extended by Ashurst, Kerstein and Wunsch [1, 4, 9].
Author(s):
Falko Schulz
BTU Cottbus
Germany
Christoph Glawe
BTU Cottbus
Germany
Heiko Schmidt
BTU Cottbus
Germany
Alan Kerstein
Consultant
United States