Re: ewald method

From: David Hardy (
Date: Fri Mar 25 2011 - 10:27:11 CDT

Dear Hasan,

By 2D Ewald method, do you mean that you want your periodic cell
replicated infinitely along the xy-plane, but not along the z direction?

If so, then the answer is, no, NAMD does not have a specialized
method for this case, but you can accomplish this by using PME and
including enough vacuum padding so that the periodic cells no longer
"see" each other along the z direction. For a system of length L
along the z direction, it is sufficient to pad above and below by L/2
+ \delta (i.e. there must be > L vacuum between the images).

Hope this helps,

On Mar 25, 2011, at 9:49 AM, Hasan haska wrote:

> Dear NAMD users,
> Does NAMD include 2D ewald method for md simulations ?
> Thanks a lot.

David J. Hardy, Ph.D.
Theoretical and Computational Biophysics
Beckman Institute, University of Illinois

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