heat and radiations in a pipe solve with chtMultiRegionSimpleFoam
 

Dear thermics Foamers,
i spent quiet a lot of time to set up a classical case, hot fumes (873K) are expelled in a exhaust (at 10m/s) this 3d pipe surrounded by air (300K) here my case:
i don't understand why chtMultiRegionSimpleFoam crach after 3s ... with this message:
Time = 3


Solving for fluid region air
DILUPBiCG: Solving for Ux, Initial residual = 0.1879951, Final residual = 0.000142781, No Iterations 4
DILUPBiCG: Solving for Uy, Initial residual = 0.1167378, Final residual = 1.852967e-05, No Iterations 4
DILUPBiCG: Solving for Uz, Initial residual = 0.1535267, Final residual = 4.351179e-05, No Iterations 4
DILUPBiCG: Solving for h, Initial residual = 1, Final residual = 0.02989284, No Iterations 2


--> FOAM FATAL ERROR:
Maximum number of iterations exceeded

From function thermo<Thermo, Type>::T(scalar f, scalar T0, scalar (thermo<Thermo, Type>::*F)(const scalar) const, scalar (thermo<Thermo, Type>::*dFdT)(const scalar) const, scalar (thermo<Thermo, Type>::*limit)(const scalar) const) const
in file /home/laurent/OpenFOAM//OpenFOAM-2.3.0/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 76.

FOAM aborting
Thank a lot for any help...