For plasmas in the collisionless regime, the absence of bulk viscosity permits multistreaming; if this occurs, fluid codes, which by definition prohibit multistreaming, give unphysical results. It is shown that a fluid code, using an energy propagation equation, will conserve energy, but nevertheless can give totally incorrect results if multistreaming occurs. If a temperature propagation equation is used instead, the system continuously loses energy when multistreaming occurs. This energy nonconservation, which is completely independent of cell size and time step, can be used as an internal test for multistreaming, requiring no data outside the fluid code itself.
Topics
Viscosity
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© 1976 American Institute of Physics.
1976
American Institute of Physics
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