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A point-force model is used to study turbulent momentum transfer in the presence of moderate mass loadings of small (relative to Kolmogorov scales), dense (relative to the carrier phase density) particles. Turbulent Couette flow is simulated via direct numerical simulation, while individual particles are tracked as Lagrangian elements interacting with the… (More)

Direct numerical simulations (DNS) of turbulent Couette flow are combined with Lagrangian point-particle tracking to investigate the effects of a dispersed phase on bulk passive heat transport when the two phases can exchange both momentum and sensible heat. The idealized setup allows a fixed number of particles, without the influence of gravity, to be… (More)

Articles you may be interested in Large eddy simulations of Taylor-Couette-Poiseuille flows in a narrow-gap system A hybrid stochastic-deconvolution model for large-eddy simulation of particle-laden flow A unified probability density function formulation to model turbulence modification in two-phase flow Characterization of near-wall turbulence in terms of… (More)

[1] Motivated by the possible effects of spray on the drag felt by the ocean surface in high winds, we use direct numerical simulation coupled with Lagrangian particle tracking to investigate how suspended inertial particles alter momentum flux in an idealized turbulent flow. Turbulent Couette flow is used for this purpose since the momentum flux profile is… (More)

- David H. Richter
- 2015

Articles you may be interested in Modification of near-wall coherent structures by inertial particles Two-way coupled, particle-laden simulations are performed in turbulent Couette flow with the purpose of investigating the spectral extent of the particle influence on the turbulent energy cascade in wall-bounded flows. Direct numerical simulation of the… (More)

- David H. Richter, Daniel P. Stern
- 2014

Key Points: • Spray dominates enthalpy flux at the hurricane air-sea interface • Enthalpy fluxes can be estimated from dropsonde thermodynamic data • Trends of enthalpy flux coefficient can be misleading due to uncertainty Evidence of spray-mediated air-sea enthalpy flux within tropical cyclones, Abstract It has long been conjectured that spray ejected from… (More)

Direct numerical simulations are performed of turbulent planar Couette flow which are seeded with two-way coupled particles at low volume concentration. Based on an understanding of the development of particle stress (horizontal momentum carried vertically on average by the particle phase) in monodisperse systems at various particle Stokes numbers, several… (More)

- Brian Helgans, David H. Richter
- 2015

Direct numerical simulations of an Eulerian-based carrier phase are performed which are two-way coupled in momentum and energy to Lagrangian droplets within a Boussinesq-type incompressible formulation, where the droplets are allowed to evaporate and condense and are thus coupled to the vapor field of the carrier phase. Turbulent planar Couette flow is… (More)

- David H. Richter
- 2013

- David H. Richter
- 2007

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