The Neumann boundary conditions are related to
conditions on the very values of the gradient of the imposed variable.
The imposed value is in this case a known constant.
We can express this concept in a mathematical manner for a variable T(x,y) as follows :
We can express this concept in a mathematical manner for a variable T(x,y) as follows :
The gradient is here projected on the directon perpendicular to the surface :
According to the considered physical problem,
the condition may be :
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