Description: The k– realizable model is a two-equation turbulence model that evolves an equation for the turbulent kinetic energy, k, and the energy dissipation rate, . The model equations are developed from fundamental physical principles and dimensional analysis; the equation for k is derived using first principles, and the equation for is postulated using physical insight. This particular version uses realizability constraints, which imposes mathematical consistency in the Reynolds stresses (such as enforcing the positivity of the normal stresses and the Cauchy-Schwarz inequality) to modify the model coefficients and the epsilon equation. These modifications guarantee the physical consistency in the predicted Reynolds stresses. To increase the accuracy of the k– realizable model in cases where the mesh is not fine enough to resolve the viscous sub-layer in wall-bounded flows, a near-wall model, known as the two-layer model, is implemented.