[Amos Li]

Hello,
I am fairly new to OpenFoam using version v2312,
I encountered the following error while simulating a heat transfer problem (chtMultiRegionFoam) in a fuel rod in the nuclear reactor：

--> FOAM FATAL ERROR: (openfoam-2312)
Negative initial temperature T0: -1.04187e+11

From Foam::scalar Foam::species::thermo<Thermo, Type>::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo<Thermo, Type>::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo<Thermo, Type>::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo<Thermo, Type>::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo<Foam::rhoConst<Foam::specie> >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo<Thermo, Type> = Foam::species::thermo<Foam::hConstThermo<Foam::rho Const<Foam::specie> >, Foam::sensibleEnthalpy>]
in file /home/liyungeng/OpenFOAM/OpenFOAM-v2312/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 57.

FOAM aborting

Here's the model I used：



The blue area is the fuel rod(heat source)，green area is the coolant，red and yellow areas are the clad.Does anybody know a solution, please?

[samisafarini]

Can you post the case files?
Have you initialised your fields correctly?

[Amos Li]

Originally Posted by samisafarini

Can you post the case files?
Have you initialised your fields correctly?

Hello!
Here is my case files:

https://drive.google.com/file/d/1KRw...usp=drive_link

I don't see what's wrong with the boundary conditions. Could you please help me take a look when you have a moment? Thank you!