The open source CFD toolbox

# Properties

• Neumann condition
• implicit

Face values are evaluated according to:

$\phi_f = \phi_c + \Delta \grad{\phi}_{ref}$

where

 $$\phi_f$$ = face value $$\phi_c$$ = cell value $$\grad(\phi)_{ref}$$ = reference gradient $$\Delta$$ = face-to-cell distance

# Usage

<patchName>
{