Open AccessImplementation of the fractional-step, artificial compressibility with pressure projection (FSAC-PP) method into openfoam for unsteady flows
Author(s) -
Jesús Gil,
Tom-Robin Teschner,
László Könözsy
Publication year - 2021
Publication title -
multidiszciplináris tudományok
Language(s) - English
Resource type - Journals
eISSN - 2786-1465
pISSN - 2062-9737
DOI - 10.35925/j.multi.2021.5.9
Subject(s) - compressibility , discretization , decoupling (probability) , incompressible flow , dual (grammatical number) , projection method , pressure correction method , projection (relational algebra) , computational fluid dynamics , mathematics , mechanics , computer science , mathematical optimization , physics , mathematical analysis , algorithm , dykstra's projection algorithm , engineering , art , literature , control engineering
Commercial and open-source CFD solvers rely mostly on incompressible approximate projection methods to overcome the pressure-velocity decoupling, such as the SIMPLE (Patankar, 1980) or PISO (Issa, 1986) algorithm. Incompressible methods based on the Artificial Compressibility method (Chorin, 1967) lack a mechanism to evolve in time and need to be supplemented by a real time derivative through the dual time scheme. The current study investigates the implementation of the explicit dual time discretization of the Artificial Compressibility method into OpenFOAM and extends on that by applying the dual time scheme to the incompressible FSAC-PP method (Könözsy, 2012). Applied to the Couette 2D flow at Re=100 and Re=1000, results show that for both methods accurate time evolutions of the velocity profiles are presented, where the FSAC-PP methods seemingly produces smoother profiles compared to the AC method, especially during the start-up of the simulation.