Large eddy simulations of reacting and non-reacting transcritical fuel sprays using multiphase thermodynamics

Fathi, M., Hickel, S., Roekaerts, D. (2022)
Physics of Fluids 34: 085131. doi: 10.1063/5.0099154

We present a novel framework for high-fidelity simulations of inert and reacting sprays with highly accurate and computationally efficient models for complex real-gas effects in high-pressure environments, especially for the hybrid subcritical/supercritical mode of evaporation during the mixing of fuel and oxidizer at transcritical conditions.

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Direct numerical simulation of interaction between a stationary crossflow instability and forward-facing steps

Casacuberta, J., Hickel, S., Westerbeek, S., Kotsonis, M. (2022)
Journal of Fluid Mechanics 943: A46. doi: 10.1017/jfm.2022.456

The interaction between forward-facing steps of several heights and a pre-existing critical stationary crossflow instability of a swept-wing boundary layer is analysed. Direct numerical simulations (DNS) complemented with solutions of the linear and the nonlinear parabolised stability equations are used towards identifying the influence of linearity and non-parallelism near the step.

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Adaptive reduced-order modeling for non-linear fluid-structure interaction

Thari, A., Pasquariello, V., Aage, N., Hickel, S. (2021)  
Computers and Fluids 229: 105099. doi: 10.1016/j.compfluid.2021.105099

We present an adaptive reduced-order model for the efficient time-resolved simulation of fluid–structure interaction problems with complex and non-linear deformations. The model is based on repeated linearizations of the structural balance equations. Upon each linearization step, the number of unknowns is strongly decreased by using modal reduction, which leads to a substantial gain in computational efficiency.

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Low-frequency unsteadiness mechanisms in shock wave/turbulent boundary layer interactions over a backward-facing step

Hu, W., Hickel, S., Van Oudheusden, B.W. (2021)
Journal of Fluid Mechanics 915: A107. doi: 10.1017/jfm.2021.95  

The low-frequency unsteady motions behind a backward-facing step (BFS) in a turbulent flow at Ma=1.7 and Re=1.3718×107 m−1 are investigated using a well-resolved large-eddy simulation.

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