[FlyingCat]

Hello,

To impose a real boundary condition with convection and conduction (and radiation) on a wall, I use the externalWallHeatFluxTemperature boundary condition:

type externalWallHeatFluxTemperature;
kappaMethod fluidThermo;
Ta uniform 300;
h uniform 10;
kappa none;
QrName Qr;
value uniform 300;

The problem is I do not know how to use the real temperature for Ta. I would like to use the temperature of the gas at the wall so it is not uniform and not constant. I try T but unsurprisingly, it does not work.

Does anyone know how to do that ?

Thanks.