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How do I run my simulation for a long time?
Posted Mar 1, 2017, 6:37 p.m. EST Studies & Solvers Version 5.1 1 Reply
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The system describes capillary flow up a microchannel.
Everything seems to be working fine until I increase the max time bound to 5 seconds instead of 0.3 seconds, at which point I get an inconsistent initial conditions error and an error about producing complex numbers. Is there something I can do to the time step function or maybe use a different scheme to solve it? I'm at a loss for what I can do to solve the system for anything longer than 0.3 seconds. I was thinking of successively solving my system by saving the state of the system every 0.3 seconds and loading that into the next simulation, but I don't know how to do that and it also seems like an unnecessarily long process.
Also, isn't there a way to adaptively change the step size? I learned about this in my undergrad with dormand-prince, but using dormand-prince for my solver gives me different kinds of errors and those have also led to dead ends.
Thanks,
Rick P.
Everything seems to be working fine until I increase the max time bound to 5 seconds instead of 0.3 seconds, at which point I get an inconsistent initial conditions error and an error about producing complex numbers. Is there something I can do to the time step function or maybe use a different scheme to solve it? I'm at a loss for what I can do to solve the system for anything longer than 0.3 seconds. I was thinking of successively solving my system by saving the state of the system every 0.3 seconds and loading that into the next simulation, but I don't know how to do that and it also seems like an unnecessarily long process.
Also, isn't there a way to adaptively change the step size? I learned about this in my undergrad with dormand-prince, but using dormand-prince for my solver gives me different kinds of errors and those have also led to dead ends.
Thanks,
Rick P.
1 Reply Last Post Mar 2, 2017, 1:25 a.m. EST
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Posted:
8 years ago
Hi,
Please check out the discussion in www.comsol.com/community/forums/general/thread/108101
Regards,
Henrik
Please check out the discussion in www.comsol.com/community/forums/general/thread/108101
Regards,
Henrik