Turbulence 
Turbulence modeling in STORM is accomplished using a twoequation kepsilon model. This model solves transport equations for the turbulence kinetic energy k, and the dissipation rate e. The turbulent shear stresses in the Reynoldsaveraged NavierStokes equations are then modeled using the Boussinesq hypothesis with an appropriate relation for the eddy or turbulent viscosity, based on the computed values of k and e. STORM/CFD2000 provides seven (7) turbulence models: Standard kepsilon model RNG kepsilon model ChenKim kepsilon model Standard kepsilon model for low Reynolds number flows RNG kepsilon model for lowReynolds number flows ChenKim kepsilon model for low Reynolds number flows LES  Smagorinsky's model 
The Standard kepsilon Turbulence Model 
The ke
turbulence model is one of several
twoequation models that have developed over the years. It is
probably the most widely and thoroughly tested of them all (Nallasamy,
1987). Based on simple dimensional arguments concerning the
relationship between the size and the energetics of individual eddies
in fully
where Cm is a dimensionless model constant, r is the local fluid density, and k and e are the specific turbulent kinetic energy (SI units: m^{2}/s^{2}) and turbulent kinetic energy dissipation rate (SI units: m^{2}/s^{3}), respectively. These quantities are in turn computed using a pair of auxiliary transport equations of the form
and
where C1 and C2 are additional dimensionless model constants; Prk and Pre are the turbulent Prandtl numbers for kinetic energy and dissipation, respectively; Sk,p and Se,p are source terms for the kinetic energy and turbulent dissipation; and the turbulent production rate is
