lammps/doc/Eqs/fix_lb_fluid_navierstokes.tex

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\documentclass[12pt]{article}
\begin{document}
$$
\partial_t \rho + \partial_{\beta}\left(\rho u_{\beta}\right)= 0
$$
$$
\partial_t\left(\rho u_{\alpha}\right) + \partial_{\beta}\left(\rho u_{\alpha} u_{\beta}\right) = \partial_{\beta}\sigma_{\alpha \beta} + F_{\alpha} + \partial_{\beta}\left(\eta_{\alpha \beta \gamma \nu}\partial_{\gamma} u_{\nu}\right)
$$
\end{document}