Formula_25628

\[\varepsilon=\frac{\mu}{2 \rho} \sum_{i, j=1}^{3}\left(\frac{\partial u_{i}}{\partial x_{j}}+\frac{\partial u_{j}}{\partial x_{i}}-\frac{2}{3} \delta_{i j} \sum_{k=1}^{3} \frac{\partial u_{k}}{\partial x_{k}}\right)^{2}+\frac{\zeta}{\rho}\left(\sum_{k=1}^{3} \frac{\partial u_{k}}{\partial x_{k}}\right)^{2}\]