pUCoupledFoam time consumption

Hgholami · December 7, 2020, 13:32

Dear foamer
the pUCoupledFoam use block matrix to solve p and u in fluid simulation. As the publication shows, the iteration is lower that segregated solver. But in cpu time, the time estimated is some time more than piso solvers. do you have same issue?

dlahaye · December 8, 2020, 03:53

I have not run the test myself.

I do imagine however that the linear solvers that OpenFoam provides by default are not the most suitable ones. Work on providing better solvers is work in progress.

OpenFoam now provides an interface to the external solver library PETSc [1]. This provides room to develop more advanced linear solvers for the coupled systems. Usual suspects include algebraic multigrid with Vanka smoothers and Schur complement preconditioners. The development of these more advanced solvers will require substantial work.

[1]: OpenFoam-PETSc interface: https://develop.openfoam.com/modules/external-solver

December 7, 2020, 13:32	pUCoupledFoam time consumption	#1
Hgholami Senior Member Hojatollah Gholami Join Date: Jan 2019 Posts: 171 Rep Power: 7	Dear foamer the pUCoupledFoam use block matrix to solve p and u in fluid simulation. As the publication shows, the iteration is lower that segregated solver. But in cpu time, the time estimated is some time more than piso solvers. do you have same issue?

December 8, 2020, 03:53		#2
dlahaye Senior Member Domenico Lahaye Join Date: Dec 2013 Posts: 802 Blog Entries: 1 Rep Power: 19	I have not run the test myself. I do imagine however that the linear solvers that OpenFoam provides by default are not the most suitable ones. Work on providing better solvers is work in progress. OpenFoam now provides an interface to the external solver library PETSc [1]. This provides room to develop more advanced linear solvers for the coupled systems. Usual suspects include algebraic multigrid with Vanka smoothers and Schur complement preconditioners. The development of these more advanced solvers will require substantial work. [1]: OpenFoam-PETSc interface: https://develop.openfoam.com/modules/external-solver cryabroad and Hgholami like this.

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