[ben_]

Hello!

I am just starting with OpenFoam, and this is my first time posting, so feel free to point out something obvious that you would assume someone else would know

I am modelling a steady state, thermal fluid flow through a pipe elbow. I am getting an error when the thermofluid model (thermoI) gets passed a negative temperature. I am also often getting the error where a variable fails to converge in the number of iterations.

I get these errors when I change the turbulence model from k-epsi to k-omega, when I extend the length of the pipe, when I run with different pipe geometries and in general when I try to change variables quickly. I would like to know where the error comes from and know how to interpret it to run simulations. This error throws even if I set basic conditions with no heat transfer.

I think it might be that my initial conditions are very extreme: ~15MPa, ~600-800K, helium fluid, pipe diameter of 10 mm. Are there any strategies to designing runs to prevent this error (add mesh refinement, etc)?

I am using a 'const' transport equation and a 'hconst' thermo equation.

Best,

Ben

[ben_]

I use this code in fvOptions and it does not crash (thanks KarenRei).

temperatureLimit
{
type limitTemperature;
active true;

limitTemperatureCoeffs
{
selectionMode all;
min 100;
max 5000;
}
}

However, there are still problems with converging the enthalpy calculation. Any ideas on that?