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Contents

ELECTRON_ORBIT_UPWIND

Definition

The amount of upwind dissipation, \gamma_e\,\!, used in the electron orbit motion.

Comments

  • Do not adjust this unless you know what you are doing.
  • This is active only if ELECTRON_METHOD=2, for which the electron motion is treated implicitly.
  • The orbit advection operator is replaced by
v\frac{\partial}{{\partial \tau}} \rightarrow v \mathcal{A} - \gamma_e |v| \mathcal{D}
  • \mathcal{A}\,\! is a 5-point centered difference derivative, and \mathcal{D}\,\! is a 5-point 4th derivative smoother. The operators are normalized so that \gamma_e=1\,\! gives the usual 3rd-order upwind scheme.
  • It is important to note that the dissipation enabled by ELECTRON_ORBIT_UPWIND acts on both distributions and fields, which is generally a bad idea.
  • See also ION_ORBIT_UPWIND.

Internal name

electron_orbit_upwind

Default

0.0

Retrieved from "http://fusion.gat.com/theory/ELECTRON_ORBIT_UPWIND"