Nonlinear multiphysics finite element code architecture in object oriented Fortran environment

The objective of the present manuscript is to describe a new architecture of the nonlinear multiphysics finite element code in object oriented Fortran environment hereafter referred to as FOOF. The salient features of FOOF are reusability, extensibility, and performance. Computational efficiency stems from the intrinsic optimization of numerical computing intrinsic to Fortran, while reusability and extensibility is inherited from the support of object-oriented programming style in Fortran 2003 and its later versions. The shortcomings of the object oriented style in Fortran 2003 (in comparison to C++) are alleviated by introducing the class hierarchy and by utilizing a multilevel programming style.