[forAurora]

Hi all,
I am getting an error that the physical quantity is nan using reactingFoam with the following error code.

PIMPLE: iteration 3
smoothSolver:  Solving for Ux, Initial residual = 0.00175845, Final residual = 1.05438e-07, No Iterations 2
smoothSolver:  Solving for Uy, Initial residual = 0.00208502, Final residual = 1.44881e-07, No Iterations 2
smoothSolver:  Solving for Uz, Initial residual = 0.00189283, Final residual = 1.31826e-07, No Iterations 2
DILUPBiCGStab:  Solving for AIR1, Initial residual = 0.000448941, Final residual = 5.89385e-09, No Iterations 1
smoothSolver:  Solving for h, Initial residual = 0.00361274, Final residual = 1.41976e-07, No Iterations 2
min/max(T) = 290.224, 312.194
GAMG:  Solving for p, Initial residual = 0.00631744, Final residual = 1.81504e-06, No Iterations 1
GAMG:  Solving for p, Initial residual = 1.81398e-06, Final residual = 1.81398e-06, No Iterations 0
diagonal:  Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 3.52147e-08, global = -4.85416e-10, cumulative = -1.48771e-07
PIMPLE: not converged within 3 iterations
ExecutionTime = 2191.31 s  ClockTime = 2268 s

Courant Number mean: 0.0646922 max: 0.500046
deltaT = 9.8345e-08
Time = 0.000250921

diagonal:  Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0
PIMPLE: iteration 1
smoothSolver:  Solving for Ux, Initial residual = 0.00103463, Final residual = 6.86593e-07, No Iterations 1
smoothSolver:  Solving for Uy, Initial residual = nan, Final residual = nan, No Iterations 1000
smoothSolver:  Solving for Uz, Initial residual = 0.00115124, Final residual = 8.4355e-07, No Iterations 1
DILUPBiCGStab:  Solving for AIR1, Initial residual = 0.00142109, Final residual = 1.16887e-07, No Iterations 1
smoothSolver:  Solving for h, Initial residual = nan, Final residual = nan, No Iterations 1000
[21] #0  Foam::error::printStack(Foam::Ostream&) at ??:?
[1] #0  Foam::error::printStack(Foam::Ostream&) at ??:?
[25] #0  Foam::error::printStack(Foam::Ostream&) at ??:?
[24] #0  Foam::error::printStack(Foam::Ostream&) at ??:?
[7] #0  Foam::error::printStack(Foam::Ostream&) at ??:?
[3] #0  Foam::error::printStack(Foam::Ostream&) at ??:?

What could be the cause of this and is this another manifestation of computational divergence? Thanks for your reply!