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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 seconds

Courant 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)

where is a cell volume, is face volumteric flux and summation goes over each cell face
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 solver

DICPCG:  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 zero

ExecutionTime = 0.19 s  ClockTime = 1 s

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