\(G_{k}=\tau_{t,ij}\frac{\partial u_{i}}{\partial x_{j}},\ \ \ \tau_{t,ij}=\mu_{t}\left(\frac{\partial u_{i}}{\partial x_{j}}+\frac{\partial u_{j}}{\partial x_{i}}\right)-\frac{2}{3}\text{ρk}\delta_{\text{ij}}\) (26)