Volume 20, Issue 1, January 2008
Index of content:
Physics of Fluids celebrates its 50th anniversary with this issue. This brief history summarizes the launching of the journal in 1958 under its first editor François Frenkiel, who held the position for more than 20 years; reviews the next under the guidance of Andreas Acrivos, a fertile period during which the journal grew and spun off its sibling, Physics of Plasmas; and then reaches the current era under the present two editors.
20(2008); http://dx.doi.org/10.1063/1.2831134View Description Hide Description
In this letter, we propose to impose physical constraints in the dynamic procedure of the dynamic subgrid-scale (SGS) stress model in large eddy simulation, and to calculate the SGS model coefficients using a constrained variation. Numerical simulations of forced and decaying isotropic turbulence demonstrate that the constrained dynamic mixed model predicts the energy evolution and the SGS energy dissipation well. The constrained SGS model also shows a strong correlation with the real stress and is able to capture the energy backscatter, manifesting a desirable feature of combining the advantages of dynamics Smagorinsky and mixed models.