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Re: [ESPResSo-users] Scaling of tabulated angular potentials

From: Paul Peterson
Subject: Re: [ESPResSo-users] Scaling of tabulated angular potentials
Date: Wed, 22 Jul 2015 11:38:03 +0200

Hi Rudolf,

thanks for your reply.
Your reasoning makes perfect sense, but the point is: when I define the tabulated angle potential I don't know what the distance (radius) will be. So what 1/r should I scale by?


2015-07-22 11:31 GMT+02:00 Rudolf Weeber <address@hidden>:
Hi Paul,
On Wed, Jul 22, 2015 at 11:07:24AM +0200, Paul Peterson wrote:
> I know this is not a new topic around here, but I've not been able to find
> an answer in these threads.
> I'm simulating a polymer with (among others) tabulated angular potentials.
> What is the 1/r scaling factor of force in this case? A distance doesn't
> seem to make much sense to me - distance is variable and depends on other
> potentials, of course.
> So what?
I think, the reasoning is that the energy U(theta) given by the potential should equal the integral of force times distnace over the path, a particle travles when the angle is increased from 0 to theta.
As the distance the particle travels increases when the radius is larger, the force has to be smaller.

Regards, Rudolf

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