INMOST Platform Technologies for Numerical Model Development

Integrated Numerical Modeling Object-oriented Supercomputing Technologies (INMOST) is an open-source, flexible, and efficient numerical modeling framework that provides to application developers all the tools required for fast development of parallel multi-physics models. The users of INMOST avoid designing and implementing their own mesh data structures. They enjoy low-level infrastructure for reading, writing, creating, manipulating, and partitioning distributed unstructured general meshes. FV discretizations of systems of PDEs may lead to systems of nonlinear algebraic equations. The nonlinear algebraic equations are solved iteratively. On each nonlinear iteration, a sparse linear system corresponding to the nonlinear residual is assembled and solved. INMOST provides software tools that cover the complete process for parallel assembly and solution of linear systems arising in the iterative solution of nonlinear systems. To simplify the solution, the user can use INMOST tool for automatic differentiation for assembly of the nonlinear residual and the corresponding Jacobian and Hessian matrices. The synergy of the monotone FV discretizations for systems of PDEs on general meshes and INMOST instruments for development of numerical models on general meshes produces a powerful tool for supercomputing simulations. This chapter describes INMOST functionality and software mechanisms for interacting with it.