# Pressure initial residual turns one

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 May 31, 2010, 08:51 Pressure initial residual turns one #1 Senior Member   BastiL Join Date: Mar 2009 Posts: 502 Rep Power: 13 Hi all, has anybody of you seen this before? It is a case running fine in 1.5.x calculated with 1.6.x it crashes a few iterations afterwards. I am wondering why iteration 78 as an initial pressure residual of 1? Code: ```Time = 77 DILUPBiCG: Solving for Ux, Initial residual = 0.0130996, Final residual = 2.71735e-10, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 0.0491252, Final residual = 4.71272e-09, No Iterations 1 DILUPBiCG: Solving for Uz, Initial residual = 0.0132883, Final residual = 1.32864e-08, No Iterations 1 GAMG: Solving for p, Initial residual = 0.0628928, Final residual = 0.00608032, No Iterations 2 time step continuity errors : sum local = 0.00601523, global = 3.79372e-05, cumulative = 0.00364392 DILUPBiCG: Solving for epsilon, Initial residual = 0.155496, Final residual = 3.79002e-09, No Iterations 1 bounding epsilon, min: -75.9715 max: 2.81917e+07 average: 57744.7 DILUPBiCG: Solving for k, Initial residual = 0.0127396, Final residual = 6.24926e-09, No Iterations 1 bounding k, min: 1e-20 max: 708.92 average: 6.3714 ExecutionTime = 1958.3 s ClockTime = 1976 s Time = 78 DILUPBiCG: Solving for Ux, Initial residual = 0.00147533, Final residual = 1.60223e+10, No Iterations 101 DILUPBiCG: Solving for Uy, Initial residual = 0.0220225, Final residual = 0.00209632, No Iterations 3 DILUPBiCG: Solving for Uz, Initial residual = 0.00800931, Final residual = 0.000435112, No Iterations 2 GAMG: Solving for p, Initial residual = 1, Final residual = 0.0590763, No Iterations 3 time step continuity errors : sum local = 6.3066e+09, global = 9.7773e+06, cumulative = 9.7773e+06 DILUPBiCG: Solving for epsilon, Initial residual = 1, Final residual = 0.0202683, No Iterations 1 bounding epsilon, min: -1525.63 max: 3.90464e+19 average: 2.31433e+15 DILUPBiCG: Solving for k, Initial residual = 1, Final residual = 0.0177444, No Iterations 1 bounding k, min: -0.00763168 max: 8.26116e+13 average: 3.27981e+10 ExecutionTime = 2030.94 s ClockTime = 2049 s```