Types of Boundary condition:

• Essential Boundary condition:

  • It is also known as Dirichlet boundary condition.
  • All essential boundary conditions applied on primary variables.
  • These B.cs. directly affect the degrees of freedom and are imposed on the left handside vector d.

• Natural boundary condition:

  • It is also known as Neumann boundary condition.
  • All natural boundary conditions applied on secondary variables.
  • These B.cs do not directly affect the degree of freedom and are imposed on the right hand side vector F.