# How Does WindNinja Work?

## WindNinja has moved, click here to view the latest version of this page

- Build a 3-D model (mesh) of the air
- prescribe an initial wind field
- compute final mass/momentum conserving wind field.

- Requires a good estimate of the initial wind field
- Adjusts for terrain (conservation of mass/momentum)
- Parameterizations for some other effects (e.g., diurnal slope flows)

To see a live WindNinja Simulation Online click here

## Assumptions

- No moisture/latent heat effects, steady-state, no conservation of energy
- Conservation of momentum is optional
- Some thermal energy parameterizations
- diurnal slope flows, non-neutral atmospheric stability

## Advantages

- Fast
- low computational requirements
- simple to run
- high spatial resolution

## Limitations

- No conservation of energy or large-scale/complex flow effects (e.g., land-sea breezes, thunderstorms)