---------- Forwarded message ---------- From: Daniel Wheeler <[email protected]> Date: Mon, Mar 5, 2012 at 12:49 PM Subject: Re: Diffusion model on level set To: wang yunbo <[email protected]>
On Sun, Mar 4, 2012 at 10:00 PM, wang yunbo <[email protected]> wrote: > Hi Dr. Wheeler, > > For a classic diffusion model, I would need to calculate the fourth order > derivative of the distance variable. Is it right? > I think so. > > In fipy terms, phi[:] would be treated as below: > > vel[:] = ((-phi).faceGrad.divergence).faceGrad.divergence > > > Do I really need an accuracy to the 4th order for distance variable phi[:]? I believe so. If so, what can be done to improve the order of accuracy in fipy? Thanks. > Not much for the distance function. The distance calculation would have to be fourth order accurate. It would be quite a lot of work to do that. -- Daniel Wheeler -- Daniel Wheeler
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