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zeroGradient Boundary Condition
Figure: The meaning of zeroGradient boundary condition
zeroGradient boundary condition simply extrapolates the quantity to the patch from the nearest cell value. The meaning is, the quantity is developed in space and its gradient is equal to zero in direction perpendicular to the patch (perpendicular to the boundary). See figure (
).
U, k, omega, epsilon, T:
boundaryField
{
".*_outlet"
{
type zeroGradient;
}
}
denotes the efficiency, 
is the torque, 
is the angular velocity, 
is the volume flow rate and 
is the specific enthalpy which can be evaluated as follows:
in
