# GfsBubble

### From Gerris

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- | A GfsBubble is a [[GfsParticulate]] that behaves as a compressible spherical bubble. The radial evolution of the bubble is described by the [[w:Sonoluminescence##Rayleigh.E2.80.93Plesset_equation|Rayleigh-Plesset equation]] coupled with the surrounding pressure field. | + | A GfsBubble is a [[GfsParticulate]] that behaves as a compressible spherical bubble. The radial evolution of the bubble is described by the [[w:Sonoluminescence#Rayleigh.E2.80.93Plesset_equation|Rayleigh-Plesset equation]] coupled with the surrounding pressure field. |

The syntax in parameter files is: | The syntax in parameter files is: |

## Current revision

A GfsBubble is a GfsParticulate that behaves as a compressible spherical bubble. The radial evolution of the bubble is described by the Rayleigh-Plesset equation coupled with the surrounding pressure field.

The syntax in parameter files is:

[ GfsParticulate ] Vr P0

where

`Vr`

- is the radial velocity
`P0`

- is the equilibrium pressure of the bubble