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## Iteration output

- What are those iteration records?
- Let us take a closer look at e.g. time 0.49 s:
Time = 0.49

*Time*means physical time in secondsCourant Number mean: 0.222158 max: 0.852134

*Courant Number mean/max*are mean/maximal CFL number for convergence condition. Roughly speaking, it can be ralated to the well known formula:(3.2) - Particularly, OpenFOAM uses the following formula:
(3.3) smoothSolver: Solving for Ux, Initial residual = 2.59115e-07, Final residual = 2.59115e-07, No Iterations 0

*smoothSolver*is linear system solver for U with smoother.- Linear system solver set-up is in file
*fvSolution* - Solver decomposes velocity vector into components and solves them separately
*Initial residual*is a measure of stability of solution with respect to previous iteration.*Final residual*is a residual when linear system solver has finished.*No Iterations*is number of iterations of linear system solverDICPCG: Solving for p, Initial residual = 8.63844e-07, Final residual = 8.63844e-07, No Iterations 0

*DICPCG*is linear system solver used for pressure (Diagonal Incomplete Cholesky Preconditioned Conjugate Gradient)- In PISO algorithm the pressure computation is repeated according to number of correctors
*nCorrectors*time step continuity errors : sum local = 6.11228e-09, global = 1.51821e-18, cumulative = 1.09644e-17

*time step continuity errors*is continuity equation error, basically it is a sum of fluxes over all mesh faces and ideally should be zeroExecutionTime = 0.19 s ClockTime = 1 s

*ExecutionTime*is the time elapsed since start of the computation.*ClockTime*is the time spent on processor(s).