Numerical prediction of shrouded probe sampling performance and a study of subgrid scale models in large eddy simulation

A numerical method was developed to predict the performance of a shrouded probe sampling at a zero yaw angle to a turbulent flow stream. The mean turbulent flow was calculated using the standard ;A predictive equation was formulated for the aspiration coefficient of shrouded probes. Use was made of a model for a single probe. A correlation function was proposed to take into account the particle inertial enrichment in the entrance region near the shroud walls. The correlation function was expressed as a function of Stokes number and velocity ratio for the shroud and determined using numerical results for the performance of shrouded probes.;Tests of two first-order dynamic subgrid scale models and their base models--the Smagorinsky model and the kinetic energy model, were made using direct numerical simulation data at high Reynolds number (Taylor microscale Reynolds number ;Subgrid nonlinear interaction and energy transfer were analyzed using direct numerical simulations of forced and decaying isotropic turbulence. Influence of cutoff wave number at different range of scale on the energetics and dynamics has been investigated.