I am using the builtin tool in ANSYS for topology optimization. There is an objective called 'compliance' which is equal to the total strain energy OR the product of displacement of node with the nodal force (C = u' * F, or simply put, the stiffness of structure)
I am using a simple rectangular column and applying a force of 1 N in negative y direction (compressive force). I am also using volume constraint to retain 33% volume. Now, when I check the solution information, the objective value is different than the one I calculate manually by calculating the deformation/movement of node in negative y direction and multiplying by nodal force..
My question is, HOW ANSYS is calculating the objective or compliance? Can you please help me out.