To calculate flow field it is required to solve the Navier-Stokes equations inside the flow domain. This is a partial differential equation system which cannot be in general solved analytically and needs to be converted into a linear equation system. The process of converting partial differential equation into a linear equation system is called discretization and can use multiple different schemes.

In the **Discretization** panel you can select discretization schemes that are most suitable for your simulation. Usually, when selecting discretization scheme there is a trade-off between accuracy and stability, which may require some experimentation to select optimal scheme.