Dear all,
Using auxiliary sweep in Comsol, what is the difference between this two cases :
1/ Run continuation for : "Last parameter"
2/ Run continuation for : "No parameter" + Reuse solution from previous step : "Yes"
I tried both, and I got a much quicker convergence (3 times faster) in case 2.
Thank you very much for your insights
Pierre
1. Run continuation for "Last parameter": With this option, COMSOL will use the solution from the previous step as the initial guess for the current step, and will attempt to continue the solution from the previous step using the same parameter value. This option is useful if the solution is expected to vary smoothly with the parameter.
2. Run continuation for "No parameter" + Reuse solution from previous step. With this option, COMSOL will reuse the solution from the previous step as the initial guess for the current step, but will not attempt to continue the solution using the same parameter value. Instead, the parameter value will be varied according to the specified range. This option is useful if the solution is not expected to vary smoothly with the parameter, or if the parameter has a discrete effect on the solution.
The reason why case 2 may converge faster than case 1 is that, by using the solution from the previous step as the initial guess, COMSOL can often converge to the final solution more quickly. This is particularly true if the solution is not expected to vary smoothly with the parameter, as in case 2. In this case, using the "Last parameter" option may result in a slower convergence because COMSOL may have to work harder to find the correct continuation of the solution from the previous step.
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