On Feb 20, 2015, at 12:08 PM, Daniel Wheeler <[email protected]> wrote:

> On Fri, Feb 20, 2015 at 6:39 AM, Ronghai Wu <[email protected]> wrote:
>> Thanks, I worked it out. But still have three questions:
>> (1) The 4th-order is split by "psi = d2fdphi2(phi-phiold) + dfdphi -
>> epsilon**2*laplace phi". I do not understand why we need
>> d2fdphi2(phi-phiold)?
> 
> Where do you see this? Do you have a link to this?

It's in 
  
http://www.ctcms.nist.gov/fipy/examples/cahnHilliard/generated/examples.cahnHilliard.mesh2DCoupled.html
that Ronghai was originally asking about.


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