I am doing a LPDC simulation in which the heat transfer coeeficient is temperature dependent and for simplicity I have considered a 2D die and casting at a temp of 400 and 700 Degree cel. respectively. When I am running the model for 15000 sec with an step size of 0.1 and maximum no of increments as 150000 then there is no change in temprature from the casting to the die. In the results it shows that die is at 400 and casting is at 700 Degree celcius only. Please can anyone suggest me what could be the reason for the same?