Before revision: Reduced order modeling (ROM) techniques are numerical methods that approximate the solution to parametric partial differential equation (PDE) is approximated by properly combining the high-fidelity solutions of the problem obtained for several configurations, i.e. for several properly chosen values of the physical/geometrical parameters characterizing the problem.
After revision: Reduced order modeling (ROM) techniques are numerical methods that approximate the solution to parametric partial differential equation (PDE) by properly combining the high-fidelity solutions of the problem obtained for several configurations, i.e. for several properly chosen values of the physical/geometrical parameters characterizing the problem.