Explicit algebraic subgrid stress models with application to rotating channel flow
2009 (English)In: Journal of Fluid Mechanics, ISSN 0022-1120, E-ISSN 1469-7645, Vol. 639, 403-432 p.Article in journal (Refereed) Published
New explicit subgrid stress models are proposed involving the strain rate and rotation rate tensor, which can account for rotation in a natural way. The new models are based on the same methodology that leads to the explicit algebraic Reynolds stress model formulation for Reynolds-averaged Navier-Stokes simulations. One dynamic model and one non-dynamic model are proposed. The non-dynamic model represents a computationally efficient subgrid scale (SGS) stress model, whereas the dynamic model is the most accurate. The models are validated through large eddy simulations (LESs) of spanwise and streamwise rotating channel flow and are compared with the standard and dynamic Smagorinsky models. The proposed explicit dependence on the system rotation improves the description of the mean velocity profiles and the turbulent kinetic energy at high rotation rates. Comparison with the dynamic Smagorinsky model shows that not using the eddy-viscosity assumption improves the description of both the Reynolds stress anisotropy and the SGS stress anisotropy. LESs of rotating channel flow at Re-tau = 950 have been carried out as well. These reveal some significant Reynolds number influences on the turbulence statistics. LESs of non-rotating turbulent channel flow at Re-tau = 950 show that the new explicit model especially at coarse resolutions significantly better predicts the mean velocity, wall shear and Reynolds stresses than the dynamic Smagorinsky model, which is probably the result of a better prediction of the anisotropy of the subgrid dissipation.
Place, publisher, year, edition, pages
2009. Vol. 639, 403-432 p.
LARGE-EDDY SIMULATION; DIRECT NUMERICAL-SIMULATION; TURBULENT FLOWS; SCALE STRESSES; CLOSURE METHOD; TRANSPORT
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-8697DOI: 10.1017/S0022112009991054ISI: 000272521600015ScopusID: 2-s2.0-76349094920OAI: oai:DiVA.org:kth-8697DiVA: diva2:14085
QC 20100825. Uppdaterad från submitted till published (20100825).2008-06-052008-06-052010-08-25Bibliographically approved