Hello fellow COMSOL users.
Can someone refer me to a model or tell me how to solve my problem.
In a system undergoing resistive heating I want to use the calculated resistive energy as the stop condition for a resistive heating step. The User Manual talks about using Probes to monitor the development of a scalar quantity and says that a Probe variable can be used as a stop condition.
In order to test the concept I developed the attached simple 2D case. It is easy enough to keep track of the resistive power by volume integrating ec.Qrh and calling it POWER. Next, I tried to keep track of resistive energy by setting up a Global Variable Probe and defining it as the time integral of power (timeint(0,t,POWER)).
When I ran the Study I received the warning that the time integral operator cannot be used in this context. Nevertheless, the resulting table looked OK. It is clear that I need help!
Also, I don’t have to be precise with regard to the stopping point. I can always control my time steps to have them close to each other within my time zone of interest.
So here is my two part question: How should I keep track of resistive energy and how do I use it as a stop condition?
Any help will be greatly appreciated.
Joe Williams
Can someone refer me to a model or tell me how to solve my problem.
In a system undergoing resistive heating I want to use the calculated resistive energy as the stop condition for a resistive heating step. The User Manual talks about using Probes to monitor the development of a scalar quantity and says that a Probe variable can be used as a stop condition.
In order to test the concept I developed the attached simple 2D case. It is easy enough to keep track of the resistive power by volume integrating ec.Qrh and calling it POWER. Next, I tried to keep track of resistive energy by setting up a Global Variable Probe and defining it as the time integral of power (timeint(0,t,POWER)).
When I ran the Study I received the warning that the time integral operator cannot be used in this context. Nevertheless, the resulting table looked OK. It is clear that I need help!
Also, I don’t have to be precise with regard to the stopping point. I can always control my time steps to have them close to each other within my time zone of interest.
So here is my two part question: How should I keep track of resistive energy and how do I use it as a stop condition?
Any help will be greatly appreciated.
Joe Williams