Geometric VoF (isoAdvector)
Geometric VoF in OpenFOAM: a sharp interface with isoAdvector
Geometric interface advection that reconstructs the surface inside each cell rather than compressing it numerically, holding a sharper interface over long runs.
What it is
Where the MULES approach keeps an interface sharp by adding a compression term, isoAdvector reconstructs the interface geometrically within each cell and advects that instead. The surface stays sharper for longer, which matters most on long runs where accumulated smearing would otherwise blur the result.
What the application sets up
- Both phases with their properties and the initial interface position
- Geometric advection controls in place of interface compression
- A time step the interface scheme can hold, which is stricter than MULES needs
- Mesh grading towards the region the interface will travel through
- Interface position and volume conservation output, since drift is the failure to watch
Typical uses
- Long free-surface runs where interface smearing would accumulate
- Thin films and sheets a smeared interface would lose entirely
- Droplet and bubble shapes, where the surface is the answer
- Cases needing tight volume conservation over many time steps
Industries
Sectors where this analysis is routinely asked for.
- Marine & offshore
- Inkjet & droplet processes
- Coating & films
- Research & academia
What comes out
- Sharp interface position over long runs
- Volume conservation history
- Thin-film and ligament survival
- Interface topology changes
OpenFOAM solvers
interIsoFoam
Selected and configured for you from the analysis type. You can still see every dictionary the application writes.
In every tier
This analysis type is in the free build. The free tier limits mesh size to 250,000 cells and solving to one core — not which physics you may use.
On accuracy, plainly.