cvode-不收敛与min step的问题

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已于 2022-03-22 20:56:47 修改 · 1.1k 阅读

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#SUNDIALS

于 2022-03-22 20:51:05 首次发布

博客讨论了在使用CVODE求解器时如何处理不收敛的步长问题。解答指出，虽然CVODE有最小步长设置，但这并不能强制求解器在不收敛时继续进行。建议使用更宽松的容差来允许在困难区域中损失精度，并在过后恢复精度。此外，给出了一个示例，说明如何在达到最小步长时动态调整容差，确保求解器能够继续推进并适时收紧容差。

https://groups.google.com/g/sundials-users/c/AFjXpOtdmME/m/jmIPhD-rBQAJ

Question:

Hi there,

before using CVODE I was writing single-step, implicit solvers with
variable time steps. And depending on the convergence criteria the
time step could get very small. However, in order not to break out the
solution I enforced a minimum time step (accepting the reduction in
accuracy).

Can this be done with CVODE as well? I mean, force the solver to go on
even if he can’t converge at a certain time step which would normally
cause him to slow down?

Thanks for any suggestions!
Bye - Andreas

CVODE在不收敛的时候，能否通过设置min step来跳过这些不收敛的点？