مقایسهٔ روش‌ها

	شبیه‌سازی گرداب‌های جدا شده	شبیه‌سازی عددی مستقیم
حوزه	دینامیک سیالات	دینامیک سیالات
خانواده	Process / pipeline	Process / pipeline
سال پیدایش	1997	1971
پدیدآور	Philippe Spalart	Steven Orszag
نوع	Hybrid turbulence modeling approach	Full-scale turbulence resolution method
منبع بنیادین	Spalart, P. R., Jou, W. H., Strelets, M., & Allmaras, S. R. (1997). Comments on the feasibility of LES for wings, and on a hybrid RANS/LES approach. Advances in DNS/LES, 1, 4-8.	Orszag, S. A. (1971). Numerical simulation of incompressible flows within simple boundaries: accuracy. Journal of Fluid Mechanics, 49(1), 75-112.
نام‌های دیگر	DES, hybrid RANS-LES	DNS, resolved turbulence simulation
مرتبط	5	5
خلاصه	Detached Eddy Simulation (DES) is a hybrid turbulence modeling approach introduced by Spalart in 1997 that combines the computational efficiency of RANS in attached boundary layers with the accuracy of LES in separated wake regions. By automatically switching between RANS and LES based on local grid spacing and turbulence length scales, DES provides superior predictions for flows with large separations, shear layers, and vortex shedding at a cost between pure RANS and pure LES. DES has become the standard method for complex aerospace applications involving separation and transient phenomena.	Direct Numerical Simulation (DNS) is a computational approach that solves the Navier-Stokes equations without turbulence models, resolving all scales of motion from the largest energy-containing eddies down to the smallest dissipative scales (Kolmogorov microscales). Pioneered by Steven Orszag in 1971, DNS provides complete information about turbulent flow fields and serves as a reference solution for validating turbulence models. However, extreme computational demands limit DNS to relatively simple geometries and low to moderate Reynolds numbers.