Magnetohydrodynamics equations for incompressible case $$\beex \bea \cfrac{\rd {\bf H}}{\rd t}-({\bf H}\cdot\n){\bf u}&=\cfrac{1}{\sigma\mu_0}\lap {\bf H},\\ \Div{\bf H}&=0,\\ \cfrac{\rd {\bf u}}{\rd t}+\n \sex{p+\cfrac{1}{2}\mu_0H^2} &=\mu_0({\bf H}\cdot\n){\bf H}+\bar \mu \lap{\bf u}+{\bf F},\\ \Div{\bf u}&={\bf 0}.  \eea \eeex$$

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