ENERGY-RELATED CONSERVATION LAW FOR FLUIDS AND MULTI-FLUID PLASMAS WITH EQUILIBRIUM-FLOW

Within the framework of dissipationless multi-fluid theory for plasmas , all nonlinear perturbations of a stationary equilibrium that could b e created from the equilibrium without breaking local entropy conserva tion are considered. Describing the fluid perturbations by Eulerian di splacement vectors reveals a general symmetry and through Noether's th eorem leads to a conservation law. Its relation to the law of energy c onservation is discussed since it will be important for the generaliza tion of the energy principle known for static equilibria in magnetohyr odynamics to an energy principle of stationary equilibria in the frame work of a multi-fluid theory. (C) 1998 American Institute of Physics.