قارن الطرق

	المحاكاة العددية المباشرة	محاكاة الدوامات الكبيرة (Large Eddy Simulation - LES)
المجال	ديناميكا الموائع	ديناميكا الموائع
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1971	1963
صاحب الطريقة	Steven Orszag	Joseph Smagorinsky
النوع	Full-scale turbulence resolution method	Scale-resolving turbulence simulation
المصدر التأسيسي	Orszag, S. A. (1971). Numerical simulation of incompressible flows within simple boundaries: accuracy. Journal of Fluid Mechanics, 49(1), 75-112.	Smagorinsky, J. (1963). General circulation experiments with the primitive equations: I. The basic experiment. Monthly Weather Review, 91(3), 99-164.
الأسماء البديلة	DNS, resolved turbulence simulation	LES, subgrid-scale modeling
ذات صلة	5	5
الملخص	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.	Large Eddy Simulation (LES) is a turbulence modeling technique that explicitly resolves large-scale turbulent eddies while modeling small-scale subgrid-scale (SGS) motions. Introduced by Joseph Smagorinsky in 1963, LES represents a middle ground between Reynolds-Averaged Navier-Stokes (RANS) and Direct Numerical Simulation (DNS). By capturing the energy-containing scales of turbulence, LES provides superior accuracy for transient flows and complex geometries at computational costs significantly lower than DNS.