In CFD models of multiphase reacting flows adopting operator splitting, the stiffness of the ODE system describing chemical kinetics dominates the computational cost. Introducing an ad-hoc estimation of the ODE solver’s time step, ∆tODE, at the beginning of each computational time step, ∆tCFD , may alleviate this issue. In this work, an improved version of the extrapolation- based SEULEX solver, which exploits the tangential stretching rate (TSR) analysis of the local thermochemical state, is tested on non-homogeneous reactors, showing significant computational saving compared with the original version.
On the Speed-Up of Extrapolation-Based Stiff ODE Solvers for Large-Scale CFD of Multiphase Reacting Flows / Liberatori, Jacopo. - (2022). (Intervento presentato al convegno 1st Italian OpenFOAM User Meeting tenutosi a Milan, Italy).
On the Speed-Up of Extrapolation-Based Stiff ODE Solvers for Large-Scale CFD of Multiphase Reacting Flows
Jacopo Liberatori
Primo
2022
Abstract
In CFD models of multiphase reacting flows adopting operator splitting, the stiffness of the ODE system describing chemical kinetics dominates the computational cost. Introducing an ad-hoc estimation of the ODE solver’s time step, ∆tODE, at the beginning of each computational time step, ∆tCFD , may alleviate this issue. In this work, an improved version of the extrapolation- based SEULEX solver, which exploits the tangential stretching rate (TSR) analysis of the local thermochemical state, is tested on non-homogeneous reactors, showing significant computational saving compared with the original version.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
