We report on investigations for designing and validating VMS-LES and hybrid approaches between RANS and VMS-LES. Beside several more usual hybridization, We propose a new hybrid RANS/LES approach for the simulation of turbulent flows, which can be interpreted in the framework of the Non-Linear Disturbance Equation (NLDE) aproach. The solution of the Navier-Stokes equations is decomposed into a mean part (RANS), a perturbed/corrected part that takes into account the turbulent large-scale fluctuations and a third part made by the unresolved (SGS) fluctuations. Several flows past cylinder and spheres are computed for validating the considered approaches. The NLDE approach is used to simulate the flow around a circular cylinder at Reynolds number 140000; results are compared with a simplified version of the hybrid model (see for example [16]).
APPLICATION OF HYBRID AND VMS-LES TURBULENT MODELS TO AERODYNAMIC SIMULATIONS
SALVETTI, MARIA VITTORIA
2010-01-01
Abstract
We report on investigations for designing and validating VMS-LES and hybrid approaches between RANS and VMS-LES. Beside several more usual hybridization, We propose a new hybrid RANS/LES approach for the simulation of turbulent flows, which can be interpreted in the framework of the Non-Linear Disturbance Equation (NLDE) aproach. The solution of the Navier-Stokes equations is decomposed into a mean part (RANS), a perturbed/corrected part that takes into account the turbulent large-scale fluctuations and a third part made by the unresolved (SGS) fluctuations. Several flows past cylinder and spheres are computed for validating the considered approaches. The NLDE approach is used to simulate the flow around a circular cylinder at Reynolds number 140000; results are compared with a simplified version of the hybrid model (see for example [16]).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
