Reacting Dynamic Hybrid Reynolds-Averaged Navier-Stokes/Large-Eddy Simulations of a Mach 3 Cavity

2019 ◽  
Author(s):  
Ez A. Hassan ◽  
David M. Peterson
Keyword(s):  
Large Eddy Simulations ◽  
Navier Stokes ◽  
Large Eddy ◽  
Reynolds Averaged Navier Stokes ◽  
Dynamic Hybrid ◽  
Mach 3

Assessment of the validity of RANS knock prediction using the resonance theory

2019 ◽  
Vol 21 (4) ◽  
pp. 610-621 ◽  
Author(s):  
Corinna Netzer ◽  
Lars Seidel ◽  
Frédéric Ravet ◽  
Fabian Mauss
Keyword(s):  
Numerical Simulations ◽  
Direct Numerical Simulations ◽  
Large Eddy Simulations ◽  
Navier Stokes ◽  
Post Processing ◽  
Resonance Theory ◽  
Auto Ignition ◽  
Engine Knock ◽  
Large Eddy ◽  
Reynolds Averaged Navier Stokes

Following the resonance theory by Bradley and co-workers, engine knock is a consequence of an auto-ignition in the developing detonation regime. Their detonation diagram was developed using direct numerical simulations and was applied in the literature to engine knock assessment using large eddy simulations. In this work, it is analyzed if the detonation diagram can be applied for post-processing and evaluation of predicted auto-ignitions in Reynolds-averaged Navier–Stokes simulations even though the Reynolds-averaged Navier–Stokes approach cannot resolve the fine structures resolved in direct numerical simulations and large eddy simulations that lead to the prediction of a developing detonation. For this purpose, an engine operating point at the knock limit spark advance is simulated using Reynolds-averaged Navier–Stokes and large eddy simulations. The combustion is predicted using the G-equation and the well-stirred reactor model in the unburnt gases based on a detailed gasoline surrogate reaction scheme. All the predicted ignition kernels are evaluated using the resonance theory in a post-processing step. According to the different turbulence models, the predicted pressure rise rates and gradients differ. However, the predicted ignition kernel sizes and imposed gas velocities by the auto-ignition event are similar, which suggests that the auto-ignitions predicted by Reynolds-averaged Navier–Stokes simulations can be given a meaningful interpretation within the detonation diagram.

Dynamic Hybrid Reynolds-Averaged Navier–Stokes/Large-Eddy Simulation of a Supersonic Cavity

2016 ◽  
Vol 32 (6) ◽  
pp. 1343-1352 ◽  
Author(s):  
Ez Hassan ◽  
David. M. Peterson ◽  
Keith Walters ◽  
Edward A. Luke
Keyword(s):  
Large Eddy Simulation ◽  
Navier Stokes ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Reynolds Averaged Navier Stokes ◽  
Dynamic Hybrid ◽  
Supersonic Cavity

Hybrid Reynolds-Averaged Navier-Stokes/Large-Eddy Simulations of Supersonic Turbulent Mixing

AIAA Journal ◽  
2003 ◽  
Vol 41 (2) ◽  
pp. 218-229 ◽  
Author(s):  
Nicholas J. Georgiadis ◽  
J. Iwan D. Alexander ◽  
Eli Reshotko
Keyword(s):  
Turbulent Mixing ◽  
Large Eddy Simulations ◽  
Navier Stokes ◽  
Large Eddy ◽  
Reynolds Averaged Navier Stokes
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