Date: Feb 15, 2013 2:52 PM
Author: Colin
Subject: Re: pdeseteq

amin <brave_heart1359@yahoo.comxxx> wrote in message <ef48d19.-1@webcrossing.raydaftYaTP>...
> hello evrybody!
> what is the "D" in pdeseteq
> PDESETEQ(TYPE,C,A,F,D,TLIST,U0,UT0,RANGE)
> bye


D is just another coefficient for the standard form of the parabolic partial differential equation. This particualr coefficient is multiplied by the first derivative of the function of interest (u'):

d*u'-div(c*grad(u))+a*u=f

In the case of heat transfer it is the ability of the material to store thermal energy (density times heat capacity):

rho*C*T'-div(k*grad(T))=Q+h*(Text-T)

M