قارن الطرق

	محاكاة الدوامات الكبيرة (Large Eddy Simulation - LES)	محاكاة الدوامات المنفصلة
المجال	ديناميكا الموائع	ديناميكا الموائع
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1963	1997
صاحب الطريقة	Joseph Smagorinsky	Philippe Spalart
النوع	Scale-resolving turbulence simulation	Hybrid turbulence modeling approach
المصدر التأسيسي	Smagorinsky, J. (1963). General circulation experiments with the primitive equations: I. The basic experiment. Monthly Weather Review, 91(3), 99-164.	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.
الأسماء البديلة	LES, subgrid-scale modeling	DES, hybrid RANS-LES
ذات صلة	5	5
الملخص	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.	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.