Re: Problems on the Cahn Hilliard Equation Example

Hi Zhiwen,

The grid spacing and time step are both too large. Change the maximum
time step to be 1 and the grid spacing to be 0.5 and the system will
remain stable and the overshoot above 1 and below 0 will also be
reduced significantly. I'll change the example in the manual to
reflect this

Cheers
.
On Tue, May 27, 2008 at 3:31 PM, Zhiwen Liang <lzwpurdue@...> wrote:
> Hi Daniel,
> The script I tested is the one in the example folder of fipy. I just made a
> small modification to print out the largest value and the smallest value of
> the variable, as attached. I run it as "python input2D
> --numberOfElements=10000 --numberOfSteps=100000". I also tried different
> mesh size and different time step size and they do not seem to help. Maybe I
> missed something.
> Regards,
> Zhiwen
>
> On Tue, May 27, 2008 at 2:09 PM, Daniel Wheeler <daniel.wheeler2@...>
> wrote:
>>
>> Hi Zhiwen,
>>
>> Can you pass me the script that you are using?
>>
>> Thanks