Enhancements of the G-Scheme Framework

• Published in: Flow, turbulence and combustion Vol. 101; no. 4; pp. 1023 - 1033
• Main Authors: Valorani, Mauro, Ciottoli, Pietro Paolo, Malpica Galassi, Riccardo, Paolucci, Samuel, Grenga, Temistocle, Martelli, Emanuele
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.12.2018; Springer Nature B.V
• Subjects: Automotive Engineering; Computing time; Engineering; Engineering Fluid Dynamics; Engineering Thermodynamics; Fluid- and Aerodynamics; Heat and Mass Transfer; Model reduction; Autoignition; Explicit solvers; Stiff solvers; Multi-scale dynamical systems; Chemical kinetics
• DOI: 10.1007/s10494-018-9942-2
• ISSN: 1386-6184

The G-Scheme is a well established framework for multi-scale adaptive model reduction, whose effectiveness was demonstrated with reference to a number of test models, together with an identification of the critical areas that were in need of further theoretical and computational refinement. In this communication, we report on how we enhanced the solver performance. Two new features involving (i) the criteria to identify the fast and slow subspace dimensions, and (ii) a criterion to decide if and when the reuse of the CSP Basis is feasible without deteriorating the overall performance of the solver, have been proved able to increase significantly the computational efficiency of the solver without sacrificing its accuracy.