How to impose this heat flux boundary condition?
if the heat flux was like that:
from t = 0.0 up to 180.0 [s] => q" = 0.0 [W m^-2];
from t = 181.0 up to 1,079.0 [s] => q" = 250.0 [W m^-2] (=>constant);
from t = 1,080.0 up to 1,260.0 [s] => q" = 0.0 [W m^-2].
I would use a 1D interpolation function.
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