I am solving a nonlinear problem. I need to use some exponential term in my energy function but I see that whenever the power is not an integer it immediately creates nan and diverge. For example: C **1. → works C 1.0000001-> doesn’t work with: Newton iteration 1: r (abs) = -nan (tol = 1.00…

Highly nonlinear problems are difficult and require a lot of care and “coaxing” to get a reasonable approximation of a solution. Assuming your residual and Jacobian are well formed with no singularities, consider these tips and tricks .

Thanks for your advice. But if you see my question it has nothing to do with those guidlines. As I mentioned the problem works with power=1. but doesn’t work with power=1.0000001

Did you solve your problem by any chance?

Non integer power doesn't work

dokken June 17, 2021, 12:57pm 2

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Non integer power doesn't work

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