# What does this log mean

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 September 14, 2005, 08:19 1,what is the meaning of the " #1 Senior Member     p ding Join Date: Mar 2009 Posts: 288 Rep Power: 9 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 = 5.5659e-06, No Iterations 12 BICCG: Solving for Uy, Initial residual = 0.340201, Final residual = 6.705e-06, No Iterations 13 ICCG: Solving for p, Initial residual = 0.661742, Final residual = 8.73282e-07, No Iterations 67 time step continuity errors : sum local = 8.54754e-09, global = 1.00275e-18, cumulative = 9.91247e-19 ICCG: Solving for p, Initial residual = 0.527485, Final residual = 9.40264e-07, No Iterations 66 time step continuity errors : sum local = 1.06335e-08, global = -1.84043e-19, cumulative = 8.07204e-19 ExecutionTime = 0.11 s

 September 14, 2005, 08:25 2. because you have said so. #2 Super Moderator     Niklas Nordin Join Date: Mar 2009 Location: Stockholm, Sweden Posts: 693 Rep Power: 20 2. because you have said so.

 September 14, 2005, 15:28 I would also like to know abou #3 New Member   Amelia Join Date: Mar 2009 Posts: 17 Rep Power: 8 I would also like to know about the meaning of the continuity errors. Is it the same as the mass conservation error?

 September 15, 2005, 10:11 1) Have a look at continuity #4 Member   Niklas Wikstrom Join Date: Mar 2009 Posts: 85 Rep Power: 8 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.

 December 14, 2005, 17:40 Dear All, I also encounter #5 Senior Member   Guoxiang Join Date: Mar 2009 Posts: 109 Rep Power: 8 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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