<a href="http://www.codecogs.com/eqnedit.php?latex=\rho&space;\overline{u}_{i}\frac{\partial&space;\overline{u}_{j}}{\partial&space;x_{j}}=\rho&space;\overline{f}_{i}&plus;\frac{\partial&space;}{\partial&space;x_{j}}[-\overline{p}\delta&space;_{ij}&plus;2\mu\overline{\\S}_{ij}-\rho\overline{u_{i}^{'}u_{j}^{'}}&space;]" target="_blank"><img src="http://latex.codecogs.com/gif.latex?\rho&space;\overline{u}_{i}\frac{\partial&space;\overline{u}_{j}}{\partial&space;x_{j}}=\rho&space;\overline{f}_{i}&plus;\frac{\partial&space;}{\partial&space;x_{j}}[-\overline{p}\delta&space;_{ij}&plus;2\mu\overline{\\S}_{ij}-\rho\overline{u_{i}^{'}u_{j}^{'}}&space;]" title="\rho \overline{u}_{i}\frac{\partial \overline{u}_{j}}{\partial x_{j}}=\rho \overline{f}_{i}+\frac{\partial }{\partial x_{j}}[-\overline{p}\delta _{ij}+2\mu\overline{\\S}_{ij}-\rho\overline{u_{i}^{'}u_{j}^{'}} ]" /></a>