Dear Jon, Thank you for your answer! By thickness of the phase interface do you mean wavelength (or half wavelength)? If so, it can be as small as 20 and as big as 170 depending on the case I’m running – both type of cases degenerated, though.
Clara > On 25 Jul 2017, at 16:48, Guyer, Jonathan E. Dr. (Fed) > <jonathan.gu...@nist.gov> wrote: > > Clara - > > The mesh needs to be fine enough to resolve the interfaces. How thick is the > phase interface for your parameters? Generally, you need O(10) grid points > across the interface. > > - Jon > > >> On Jul 25, 2017, at 1:50 PM, Clara Maurel <cmau...@mit.edu> wrote: >> >> Hello, >> >> Sorry in advance if my question is very basic. I am using fipy to solve a >> Cahn-Hilliard equation problem, and it worked perfectly fine on a 1D domain >> of size nx*dx where nx=500 and dx=0.5. >> I wanted to run on a larger domain, but in order to reduce the computation >> time, I increase the spatial resolution; now the size of my domain is nx*dx >> where nx=2500 and dx=2. This lead to a diverging solution for all my runs. >> >> I was wondering whether there was optimal ratios of nx and dx, or length and >> dx, which had to be implemented so that the code does not diverge even on a >> greater scale? Or if not, if anyone had an idea of what could be going on, >> given that I only did this change between the two versions of the code. >> >> Thank you in advance for you help! >> >> Clara_______________________________________________ >> fipy mailing list >> fipy@nist.gov >> http://www.ctcms.nist.gov/fipy >> [ NIST internal ONLY: https://email.nist.gov/mailman/listinfo/fipy ] > > > _______________________________________________ > fipy mailing list > fipy@nist.gov > http://www.ctcms.nist.gov/fipy > [ NIST internal ONLY: https://email.nist.gov/mailman/listinfo/fipy ]
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