ZeroGradient definition

ZeroGradient means that the gradient of any parameter is zero at the boundary. For the pressure that means no change in the direction normal to the surface, ∂p/∂n = 0. Similarly, for the velocity the zero gradient boundary condition means ∂u/∂n = 0 at the boundary, where u = [u, v, w]. ‘Fixed value’ of zero for the velocity at the surface of the decks corresponds to the no-slip condition, and at the inlet the velocity is set to normalized value to the positive x-direction.
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