# GfsPhysicalParams

(Difference between revisions)
 Revision as of 21:33, 22 March 2010Popinet (Talk | contribs)← Previous diff Current revisionPopinet (Talk | contribs) Line 1: Line 1: - For the [[GfsOcean]] and [[GfsRiver]] solvers only, use GfsPhysicalParams to set the gravitational field strength g (a number). + GfsPhysicalParams controls the following physical parameters + + { + L = NUMBER + g = NUMBER + alpha = [ [[GfsFunction]] ] + } - For example, from the [http://gfs.sourceforge.net/tests/tests/geo.html Geostrophic adjustment] test case + with - PhysicalParams { g = 9.4534734306584e-4 } + ;L: the size of a [[GfsBox]] (default is unity), - + ;g: for the [[GfsOcean]] and [[GfsRiver]] solvers only, the strength of the gravitational field (default is unity), - For the [[GfsSimulation]] solver, use GfsPhysicalParams to set the the specific volume (the reciprocal of density) alpha (a scalar field). + ;alpha: for the [[GfsSimulation]] solver, the specific volume (i.e the inverse of density) (default is unity). - + - For example, from the [http://gfs.sourceforge.net/examples/examples/rt.html Rayleigh–Taylor] example + - + - VariableTracerVOF T + - InitFraction T (0.05*cos (2.*M_PI*x) + y) { ty = 0.5 } + - PhysicalParams { alpha = 1./(T*1.225 + (1. - T)*0.1694) } + - + - (here the fluid with characteristic function T has density 1.225 and the other fluid has density 0.1694). +

## Current revision

GfsPhysicalParams controls the following physical parameters

```{
L = NUMBER
g = NUMBER
alpha = [ GfsFunction ]
}
```

with

`L`
the size of a GfsBox (default is unity),
`g`
for the GfsOcean and GfsRiver solvers only, the strength of the gravitational field (default is unity),
`alpha`
for the GfsSimulation solver, the specific volume (i.e the inverse of density) (default is unity).