|type de publication
||article dans une revue internationale avec comité de lecture
|date de publication
||Thais Laurent; Tejada-Matinez Andrés E.; Gatski Thomas B.; Mompean Gilmar|
||Physics of Fluids (Phys Fluid)
|numéro de papier
| || |
||We report on temporal large eddy simulations (TLES) of the turbulent channel flow of a dilute polymer
solution modeled with the FENE-P (Finitely Extensible Non-linear Elastic in the Peterlin approximation)
constitutive equation. The large eddy simulations are based upon an approximate temporal deconvolution
method (Pruett et al., Phys. of Fluids, 18, pp.028104-1-028104-4, 2006) for residual Newtonian stress modeling
and secondary regularization for unresolved subfilter Newtonian stress. The filtered conformation tensor
equation involves deconvolution for stretching and for the nonlinear spring force, as well as secondary regularization.
Results are shown at a friction Reynolds number 180 for Weissenberg numbers and molecular extensibilities
spanning the moderate to high drag reducing regimes. Excellent agreement is obtained between TLES and
DNS (direct numerical simulations) in terms of percent drag reduction prediction. TLES is also able to
reproduce the high level of anisotropy of turbulence, which confirms recent findings by Frohnapfel et al. (J.
Fluid Mech., 577, pp. 457-466, 2007) who present high anisotropy as a general mechanism to obtain significant
drag reduction. The TLES model proves itself stable and its overall computational workload some 60 times
less than DNS.
||channel flow, deconvolution, drag reduction, elasticity, flow simulation, friction, non-Newtonian flow, tensors, turbulence