### Application of BC's

The boundary conditions (Single Point Constraints and Multiple Point Constraints) are applied to the physical variables , and in routine applybounfem.f. The same applies to the turbulence parameters and , however, in that case the boundary conditions are not defined by the user in the input deck. Rather, they are automatically calculated based on the recommendations in [50] by CalculiX. Any change in the physical variables (in vold) is immediately transferred to the conservative variables (in vcon) too.