Journal ArticleDOI
Trajectory and entrainment of a round jet in crossflow
Lester L. Yuan,Robert L. Street +1 more
TLDR
In this article, the authors examined the trajectory and entrainment characteristics of a round jet in crossflow and showed that the entrainments of crossflow fluid is the primary mechanism by which the jet trajectory is determined.Abstract:
This paper examines the trajectory and entrainment characteristics of a round jet in crossflow. A series of large eddy simulations was performed at Reynolds numbers of 1050 and 2100 and at jet to crossflow velocity ratios of 2.0 and 3.3. Trajectories, which are defined based on the mean streamlines on the centerplane, all collapse to a single curve far from the jet exit, and this curve can be represented with a power law fit. Within this power law region, entrainment of crossflow fluid is shown to be the primary mechanism by which the jet trajectory is determined. Upstream of the power law region, near the jet exit, jet trajectory varies from changes in pressure drag and from differences in the turbulence intensities in the incoming pipe flow.read more
Citations
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Journal ArticleDOI
Transverse jets and their control
TL;DR: The transverse jet has been studied extensively because of its relevance to a wide variety of flows in technological systems, including fuel or dilution air injection in gas turbine engines, thrust vector control for high speed airbreathing and rocket vehicles, and exhaust plumes from power plants as discussed by the authors.
Journal ArticleDOI
Study of trajectories of jets in crossflow using direct numerical simulations
Suman Muppidi,Krishnan Mahesh +1 more
TL;DR: In this paper, the trajectories and near field of round jets in cross-flow were investigated at velocity ratios of 1.5 and 5.7 and the effects of jet velocity profile and boundary layer thickness on the jet trajectory were examined.
Journal Article
On the Formation of the Counter--Rotating Vortex Pair in Transverse Jets
Luca Cortelezzi,Ann Karagozian +1 more
TL;DR: In this paper, the authors focus on the mechanisms for the dynamical generation and evolution of vortical structures in the flow field, in particular the counter-rotating vortex pair associated with the jet cross-section.
Journal ArticleDOI
Direct numerical simulation of round turbulent jets in crossflow
Suman Muppidi,Krishnan Mahesh +1 more
TL;DR: In this paper, a round turbulent jet in a laminar crossflow is simulated and the mean velocity and turbulent intensities from the simulations are compared to data from the experiments by Su & Mungal (2004) and good agreement is observed.
Journal ArticleDOI
Transverse-jet shear-layer instabilities. Part 1. Experimental studies
TL;DR: In this article, a detailed exploration of the near-field shear-layer instabilities associated with a gaseous jet injected normally into crossflow, also known as the transverse jet, was provided.
References
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Book
Mixing in Inland and Coastal Waters
TL;DR: In this paper, the concept of Fickian Diffusion and Turbulent Diffusion is used for mixing in rivers and estuaries, and an estimate for the density of seawater is given.
Journal ArticleDOI
Measurements of entrainment by axisymmetrical turbulent jets
F. P. Ricou,D. B. Spalding +1 more
TL;DR: In this article, a new technique is described for measuring the axial mass flow rate in the turbulent jet formed when a gas in injected into a reservoir of stagnant air at uniform pressure.
Journal ArticleDOI
A dynamic mixed subgrid‐scale model and its application to turbulent recirculating flows
TL;DR: In this paper, Germano et al. proposed a new dynamic mixed model that explicitly calculates the modified Leonard term and only models the cross term and the SGS Reynolds stress, which retains favorable features of DSM and does not require that the principal axes of the stress tensor be aligned with those of the strain rate tensor.
Journal ArticleDOI
An experimental study of round jets in cross-flow
TL;DR: In this article, the structure of round jets in cross-flow was studied using flow visualization techniques and flying-hot-wire measurements, restricted to jet to freestream velocity ratios ranging from 2.0 to 6.0.
Journal ArticleDOI
A non-staggered grid, fractional step method for time-dependent incompressible Navier-Stokes equations in curvilinear coordinates
TL;DR: In this article, a numerical method for solving three-dimensional, time-dependent incompressible Navier-Stokes equations in curvilinear coordinates is presented, where the Cartesian velocity components and the pressure are defined at the center of a control volume, while the volume fluxes are defined on their corresponding cell faces.