Discussion Forum

Note: The easiest way for you to help others to help you to diagnose a problem in your model is for you to post your model to the forum, so the details of it can be examined.

Now, without your model file to look at, here's my wild guess: In time-domain models, you normally have to specify (such as under Settings/Time Dependent --> Study Settings) the times of interest. The default (on my system) is typically range(0,0.1,1). So, if I didn't change that setting, my time-domain simulations would run from t=0 to t=1.0s. You say that yours is consistently terminating at t = 10,000s. Perhaps this may seem like a trivial question, but what did you specify for the range of times that you actually wanted for the simulation to run? Do you, by some chance, have it set to 10000s? If so... well, that would explain a lot! But if not, then... maybe you could post your file to the forum?

Best regards.

Yeah I agree time dependent studies has default settings. But in my case, I did not have a chance to set this time given that I'm running cyclic voltammetry studies( see attached screenshots for the some of the configurations).

In this kind of simulation, you set the linear sweep rate, vertex potentials 1&2 and the number of cycles you will run your simulation.

In a cyclic voltammetry, 1 cycle represents 1 forward and reverse sweep (i.e Vertex 1 -> Vertex 2 -> Vertex 1). So in effect, the time to complete 1 cycle at 4mV/s rate is equivalent to

note: It is multiplied by 2 to cover the reverse scan.

At , the total time must be 50000s, however as I said before, I cannot run simulation greater than 10000s, making the solver fails to reach the target 100cycles at 4mV/s(only 20cycles at 10000s). I don't know if this is set as default in comsol but I'm not using Time dependent on my studysteps so I guess the problem is elsewhere.

Thank you for your help.

Regards,

Paul

Note: The easiest way for you to help others to help you to diagnose a problem in your model is for you to post your model to the forum, so the details of it can be examined.

Now, without your model file to look at, here's my wild guess: In time-domain models, you normally have to specify (such as under Settings/Time Dependent --> Study Settings) the times of interest. The default (on my system) is typically range(0,0.1,1). So, if I didn't change that setting, my time-domain simulations would run from t=0 to t=1.0s. You say that yours is consistently terminating at t = 10,000s. Perhaps this may seem like a trivial question, but what did you specify for the range of times that you actually wanted for the simulation to run? Do you, by some chance, have it set to 10000s? If so... well, that would explain a lot! But if not, then... maybe you could post your file to the forum?

Best regards.

Thank you for your help, I solve the issue following your suggestion. It turns out by default, the maximum timestep in the time-dependent solver for Cyclic voltammetry is set to 0 1e4(see attached screenshot). I was able to change it by manually defining the solver.

Yeah I agree time dependent studies has default settings. But in my case, I did not have a chance to set this time given that I'm running cyclic voltammetry studies( see attached screenshots for the some of the configurations).

In this kind of simulation, you set the linear sweep rate, vertex potentials 1&2 and the number of cycles you will run your simulation.

In a cyclic voltammetry, 1 cycle represents 1 forward and reverse sweep (i.e Vertex 1 -> Vertex 2 -> Vertex 1). So in effect, the time to complete 1 cycle at 4mV/s rate is equivalent to
t = 2\frac{E_{vertex2}-E_{vertex1}}{sweep_{rate}} t = 2\frac{2V-1V}{0.004V/s} t = 500s

note: It is multiplied by 2 to cover the reverse scan.

At n_{cycles}=100, the total time must be 50000s, however as I said before, I cannot run simulation greater than 10000s, making the solver fails to reach the target 100cycles at 4mV/s(only 20cycles at 10000s). I don't know if this is set as default in comsol but I'm not using Time dependent on my studysteps so I guess the problem is elsewhere.

Thank you for your help.

Regards,

Paul

Note: The easiest way for you to help others to help you to diagnose a problem in your model is for you to post your model to the forum, so the details of it can be examined.

Now, without your model file to look at, here's my wild guess: In time-domain models, you normally have to specify (such as under Settings/Time Dependent --> Study Settings) the times of interest. The default (on my system) is typically range(0,0.1,1). So, if I didn't change that setting, my time-domain simulations would run from t=0 to t=1.0s. You say that yours is consistently terminating at t = 10,000s. Perhaps this may seem like a trivial question, but what did you specify for the range of times that you actually wanted for the simulation to run? Do you, by some chance, have it set to 10000s? If so... well, that would explain a lot! But if not, then... maybe you could post your file to the forum?

Best regards.