Explore BrainMass

Partial Differential Equation : Diffusion Equation and Explicit Series Solution

Consider the diffusion equation
ut = ku.xx for 0 < < pi and t > 0 with the boundary conditions
ux(0, t) = 0 and u(pi, t) = 0
and the initial condition
u(x,0) = 1.
(a) Find the separated solutions satisfying the differential equation and boundary conditions.
(b) Use these solutions to write an explicit series solution to the differential equation satisfying the boundary conditions and the initial condition.

© BrainMass Inc. brainmass.com June 21, 2018, 12:14 am ad1c9bdddf


Solution Preview

Please see the attached file for the full solution.
Thanks for using BrainMass.


(a) Since this is a diffusion equation, we have k>0. We use separated variable method. Assume that its solution . Then


By , we have

Letting ,where then we have

Solution Summary

A Diffusion Equation and Explicit Series Solution are investigated. The solution is detailed and well presented. The response was given a rating of "5" by the student who originally posted the question.