<math> T(i,j,k) = \frac{1}{6} \big[ T(i+1,j,k) + T(i-1,j,k) + T(i,j+1,k) + T(i,j-1,k) + T(i,j,k+1) + T(i,j,k-1) \big] </math>
The standard types of domain boundary conditions take the following forms:
*Dirichlet boundary condition: T = T<sub>0</sub> =const.
*Neumann boundary condition: ∂T/∂n = -q<sub>s0</sub>/k = const.
*Adiabatic boundary condition: ∂T/∂n = 0.
*Convective boundary condition: ∂T/∂n = h(T-T<sub>∞</sub>)/k.
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