MHD Fluid

Failed to parse (Conversion error. Server ("https://wikimedia.org/api/rest_") reported: "Cannot get mml. Server problem."): {\displaystyle \rho \left({\frac {Du}{Dt}}\right)=-\nabla P+J\times B+\eta \nabla ^{2}u}

$${\frac {\partial B}{\partial t}}=\nabla \times (u\times B-\eta \nabla B)$$

Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle E + u \times B = \eta J }

Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \rho \left(\frac{D\varepsilon}{Dt}\right) = -P \nabla \cdot u + \nabla \cdot (k \nabla T) + \eta J^2 }

$${\frac {D\rho }{Dt}}+\rho \nabla \cdot u=0$$