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Large-Eddy Simulation of Molecular Mixing in a

Large-Eddy Simulation of Molecular Mixing in a 2025

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The document presents a doctoral thesis by Georgios Matheou, focusing on the large-eddy simulation (LES) of molecular mixing in a recirculating shear flow, particularly within an expansion-ramp geometry. The study aims to enhance mixing and flameholding characteristics for hypersonic air-breathing propulsion applications. It employs a stretched-vortex model for subgrid scale turbulent transport and validates the numerical methods against experimental data. Key findings include the successful prediction of flow dynamics, mixing efficiency, and the importance of boundary conditions in accurately modeling turbulent flows. The research highlights the significance of grid resolution on simulation accuracy and provides insights into the behavior of passive scalars in turbulent environments.

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What is a very large eddy simulation?

Large Eddy Simulation (LES), on the other hand, is a turbulence model that computes more turbulent length scales than RANS, with the turbulent energy within the inertial sub-range separated into resolved large-scale eddies and unresolved small-scale eddies.

How do LES know distinguish big eddies and small eddies?

With LES, larger eddies that can be captured by mesh are calculated directly, whereas the effects of smaller eddies that cannot be captured by mesh are accounted for with modeling (Figure 12.1).

What are the disadvantages of LES?

Another disadvantage of LES is the need for appropriate subgrid-scale models to accurately represent the effects of the unresolved small-scale turbulence. The choice of subgrid-scale model can significantly impact the accuracy of the results, and there is no universally best model for all types of turbulent flows.

What are the applications of large eddy simulation?

LES is currently applied in a wide variety of engineering applications, including combustion, acoustics, and simulations of the atmospheric boundary layer. Large eddy simulation of a turbulent gas velocity field.

What is a large eddy simulation?

Large Eddy Simulation (LES) is a computational fluid dynamics (CFD) technique that simulates turbulent flows. LES is based on the idea that large turbulent eddies contain most of the energy of a turbulent flow, while smaller eddies dissipate that energy as heat.