Particle propagator

PushEta

Advances var.

What it solves

For each marker

p

, solves

\frac{d x _{p} ( t )}{d t} = v_{p},

in logical space given by $x = F (η)$ :

\frac{d η _{p} ( t )}{d t} = D F^{- 1} (η_{p} (t)) v_{p},

for constant $v_{p}$ . Available algorithms:

The variables this step updates over a time step dt, and the discrete spaces each one accepts.

Name	Kind	Accepted spaces
`var`	PICVariable or SPHVariable	—

Set these on the propagator in a parameter file, for example PushEta.Options(butcher=...).

Option	Default	Choices	Description
`butcher`	`None`	ButcherTableau	Butcher tableau used for explicit Runge-Kutta marker pushing. If `None`, defaults to `ButcherTableau()`.

Each model splits its time step into a sequence of propagators. This one appears in 10 models, at the position shown.