Improved k-ε Model in Stratified Flows

2DV Nonlinear k-ε Turbulence Modeling of Stratified Flows

The commonly used linear k-ε turbulence model is shown to be incapable of accurate prediction of turbulent flows, where non-isotropy is dominant. Two examples of non-isotropic flows, which have a wide range of applications in marine waters, are saline water flow and the stratified flows due to temperature gradients. These relate to stratification and consequently, variation of density through...

Investigation of Buoyant Parameters of k-ε Turbulence Model in Gravity Stratified Flows

Different variants for buoyancy-affected terms in k-ε turbulence model have been utilized to predict the flow parameters more accurately, and investigate applicability of alternative k-ε turbulence buoyant closures in numerical simulation of a horizontal gravity current. The additional non-isotropic turbulent stress due to buoyancy has been considered in production term, based on Algebraic Stre...

Simulating separated flows using the k - ε model

Assessment of k-ε / EASM Turbulence Model Upgrades for Analyzing High Speed Aeropropulsive Flows*

This paper discusses the numerical simulations of selected high-speed aeropropulsive applications including axisymmetric supersonic base flowfields, with and without jets, and three-dimensional supersonic hot jets. Comparisons are made using a compressibility corrected k-ε turbulence model and an Explicit Algebraic Stress Model (EASM). The present EASM, referred to as EASM/J, has been modified ...

Patterns in ε ′ / ε and ε K with Implications for Rare Kaon Decays and ∆ M K

The Standard Model (SM) prediction for the ratio ε′/ε appears to be significantly below the experimental data. Also εK in the SM tends to be below the data. Any new physics (NP) removing these anomalies will first of all have impact on flavour observables in the K meson system, in particular on rare decays K+ → π+νν̄, KL → π0νν̄, KL → μ+μ− and KL → π0`+`− and ∆MK . Restricting the operators contr...