Hi there,
I am modelling a temperature sensor in COMSOL Multiphysics v5.2a. I want to evaluate a boundary condition (BC) to 1 when the temperature is below 39 degC and to 0 when it is higher than 39 degC. This boundary condition is an energy source (I am using the joule heating module), that can increase the temperature of all domains. However, as you can see by the picture that I attached, there is a small problem. In this picture, when there is an of the y value it means that the BC evaluated to 1. But if I look at the temperature at that specific point its value is 39.0117 and the solver should evaluate it to 0. Any idea on how I can make sure that the BC is zero for values above 39 degC? In my case it is very important to make sure that it is 39!
Thanks folks
PS: I have tried to decrease the solver tolerance to 10^-10 and to use the events interface, but the same problem occurs