[immortality]

I have set Pimple nCorrectors to 10 but despite of this high value pimple doesn't converge at each time step.my problem is transient.
what does that message about not converging mean?then why diverging doesnt occurs immediately after not converging at a time step?

PIMPLE: iteration 9
DILUPBiCG:  Solving for Ux, Initial residual = 1.660614399e-06, Final residual = 1.382107362e-16, No Iterations 2
DILUPBiCG:  Solving for Uy, Initial residual = 2.725991237e-05, Final residual = 1.71994151e-15, No Iterations 2
DILUPBiCG:  Solving for h, Initial residual = 4.640570901e-07, Final residual = 2.664924362e-17, No Iterations 2
FDICPCG:  Solving for p, Initial residual = 1.311912104e-06, Final residual = 3.564637383e-15, No Iterations 6
FDICPCG:  Solving for p, Initial residual = 7.244953397e-14, Final residual = 2.568884643e-15, No Iterations 1
diagonal:  Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 2.343009192e-16, global = 1.367661713e-17, cumulative = 2.07229617e-08
rho max/min : 2.417134107 2.398184636
FDICPCG:  Solving for p, Initial residual = 2.735098395e-09, Final residual = 5.153284331e-15, No Iterations 4
FDICPCG:  Solving for p, Initial residual = 5.535348519e-14, Final residual = 2.142343159e-15, No Iterations 1
diagonal:  Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 2.334873446e-16, global = 1.47642379e-17, cumulative = 2.072296172e-08
rho max/min : 2.417134107 2.398184636
FDICPCG:  Solving for p, Initial residual = 1.335350283e-11, Final residual = 6.963764942e-16, No Iterations 3
FDICPCG:  Solving for p, Initial residual = 4.134830709e-14, Final residual = 1.474027945e-15, No Iterations 1
diagonal:  Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 2.301559708e-16, global = 1.40876864e-17, cumulative = 2.072296173e-08
rho max/min : 2.417134107 2.398184636
PIMPLE: iteration 10
DILUPBiCG:  Solving for Ux, Initial residual = 1.82942849e-06, Final residual = 5.541810383e-17, No Iterations 2
DILUPBiCG:  Solving for Uy, Initial residual = 2.959945528e-05, Final residual = 2.277521743e-15, No Iterations 2
DILUPBiCG:  Solving for h, Initial residual = 6.035283727e-07, Final residual = 9.136129994e-17, No Iterations 2
FDICPCG:  Solving for p, Initial residual = 1.595530764e-06, Final residual = 3.504793444e-15, No Iterations 6
FDICPCG:  Solving for p, Initial residual = 7.14289137e-14, Final residual = 2.634399827e-15, No Iterations 1
diagonal:  Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 2.339840533e-16, global = 1.340257095e-17, cumulative = 2.072296174e-08
rho max/min : 2.417134107 2.398184636
FDICPCG:  Solving for p, Initial residual = 2.868202145e-09, Final residual = 5.345704264e-15, No Iterations 4
FDICPCG:  Solving for p, Initial residual = 5.420100184e-14, Final residual = 1.936677383e-15, No Iterations 1
diagonal:  Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 2.324211337e-16, global = 1.342398081e-17, cumulative = 2.072296176e-08
rho max/min : 2.417134107 2.398184636
FDICPCG:  Solving for p, Initial residual = 1.966838831e-11, Final residual = 6.116982397e-16, No Iterations 3
FDICPCG:  Solving for p, Initial residual = 4.085579847e-14, Final residual = 1.43049529e-15, No Iterations 1
diagonal:  Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 2.304000431e-16, global = 1.357813178e-17, cumulative = 2.072296177e-08
rho max/min : 2.417134107 2.398184636
PIMPLE: not converged within 10 iterations

my fvSolution is:

solvers
{
    p
    {
       solver PCG;
       preconditioner FDIC;
       tolerance  1e-14;
       relTol 0;
       nsweeps 1000;
       maxIter 25000;

     /*solver          GAMG;
        smoother  DICGaussSeidel;
        cacheAgglomeration true;
        nCellsInCoarsestLevel 200;
        nPreSweeps      0;
        nPostSweeps     2;
        nFinestSweeps   2;
        agglomerator  faceAreaPair;
        mergeLevels 2;
        tolerance       1e-012;
        relTol          0;*/
    }

    pFinal
    {
        $p;
        relTol          0;
    }

    "rho.*"
    {
        $p;
        tolerance       1e-12;
        relTol          0;
    }

    "(U|e|h|R|k|epsilon|omega)"
    {
        solver          PBiCG;
        preconditioner  DILU;
        tolerance       1e-12;
        relTol          0;
        maxIter 25000;
    }

    "(U|h|R|k|epsilon|omega)Final"
    {
        $U;
        relTol          0;
    }
}


PIMPLE
{
    momentumPredictor yes;
    nOuterCorrectors 10;
    nCorrectors     5;
    nNonOrthogonalCorrectors 1;
    rhoMin          rhoMin [ 1 -3 0 0 0 ] .6;
    rhoMax          rhoMax [ 1 -3 0 0 0 ] 8.5;
    //convergence        1e-16;

residualControl
    {
        "(p|U|k|omega)"
        {
            relTol          0;
            tolerance       0.0000000001;
        }
    }
}
/*relaxationFactors
 {
   fields
   {
   p  0.9;
   }
equations
{
   U    .99;
   k    .99;
   omega .99;
   h     .99;
   e     .99;
}*/