Suppose we have a rectangular geometry and on all the faces we have convective boundary condition. This is a steady state conduction problem. Then on any corner point if we write discretization eq. we will have 2 imaginary points which we have to find by boundary conditions. Please exlain how do we get those 2 imaginary points to substitute in the discretization eqn.

Thank you,

Sumeet Kumar

boundary conditions will take care of the missing info that you will need. If you are still not clear on what I am talking about, check out dirichlet or neuman boundary conditions from a numerical methods book.