1,what is the meaning of the "
1,what is the meaning of the "time step continuity errors "
2, why the openfoam solve the P equation for two times . time step continuity errors Mean and max Courant Numbers = 0.104862 1.499 BICCG: Solving for Ux, Initial residual = 0.126377, Final residual = 5.5659e06, No Iterations 12 BICCG: Solving for Uy, Initial residual = 0.340201, Final residual = 6.705e06, No Iterations 13 ICCG: Solving for p, Initial residual = 0.661742, Final residual = 8.73282e07, No Iterations 67 time step continuity errors : sum local = 8.54754e09, global = 1.00275e18, cumulative = 9.91247e19 ICCG: Solving for p, Initial residual = 0.527485, Final residual = 9.40264e07, No Iterations 66 time step continuity errors : sum local = 1.06335e08, global = 1.84043e19, cumulative = 8.07204e19 ExecutionTime = 0.11 s 
2. because you have said so.
2. because you have said so.

I would also like to know abou
I would also like to know about the meaning of the continuity errors. Is it the same as the mass conservation error?

1)
Have a look at continuity
1)
Have a look at continuityErrs.H ($FOAM_SRC/cfdTools/incompressible/continuityErrs.H) The implementation is rather instructive. 2) Look in the case file: system/fvSolution, where you define the number of PISO corrections. 
Dear All,
I also encounter
Dear All,
I also encounter this question when I run icoFoam case with 92*92*32 mesh. my time step is 0.005. I am not sure how to solve this problem. Increase or decrease the PISO or others? Could you please give some advice? Thanks a lot, Guoxiang 
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