Control of Mixing Layer Developing Structures Using a Vortex Ring.

Large–eddy simulations of a turbulent mixing layer using the stretched–vortex subgrid model

This paper reports results from a large–eddy simulation of a temporal mixing layer using the stretched–vortex subgrid stress and mixing models. The simulation achieves a Reynolds number of about 2× 107 when based on the momentum thickness. Linear growth of the momentum thickness and collapse of the mean velocity and scalar concentration profiles suggest that the flow is self–similar. Considerab...

Scalar mixing and strain dynamics methodologies for PIV/LIF measurements of vortex ring flows Scalar mixing and strain dynamics methodologies for PIV/LIF measurements of vortex ring flows

Fluid mixing operations are central to possibly all chemical, petrochemical, and pharmaceutical industries, either being related to biphasic blending in polymerisation processes, cell suspension for biopharmaceuticals production and fractionation of complex oil mixtures. This work aims at providing a fundamental understanding of the mixing and stretching dynamics occurring in a reactor in the p...

Vortex ring

By rigorous mathematical method, we construct traveling wave solutions with a stationary or traveling vortex ring to the Gross-Pitaevskii equation iût = ε 2 4 û + ( Ṽ − |û| ) û, û ∈ H(R), where the unknown function û is defined as û : R × R → C, ε is a small positive parameter and Ṽ is a smooth potential.

Nonpremixed ignition of H2/air in a mixing layer with a vortex

The ignition of a laminar non-premixed H2/air mixing layer with an embedded vortex was computationally studied with detailed chemistry and transport. The initial vortex velocity and pressure fields were specified based on the stream function of an incompressible nonviscous vortex. The fuel side is pure hydrogen at 300 K, and the oxidizer side is air at 2000 K. The vortex evolution process was f...

Evolution of a Curved Vortex Filament into a Vortex Ring