We will solve the heat equation u, = 2 ux, 0 < x < 10, t> 0 with boundary/initial conditions: u(0, г) 3D 0, u(10, г) %3D 0, and u(x, 0) = { 3, 0

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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We will solve the heat equation
u; = 2 uxx,
0 <x < 10, t >0
with boundary/initial conditions:
u(0, г) 3D 0,
( 3, 0<x< 5
(0, 5<x< 10
and u(x, 0) =
u(10, г) — 0,
This models temperature in a thin rod of length L = 10 with thermal diffusivity a = 2 where the temperature at the ends is fixed at 0 and the initial
temperature distribution is u(x, 0).
For extra practice we will solve this problem from scratch.
- Separate Variables.
Assume u(x, t) = X(x) T(t) and split the PDE into two differential equations, one with X and one with T.
= -A
(Notation: Write X" and T' for derivatives. Place all constants in the differential equation with T).
DE for X(x):
= 0
Boundary conditions for X(x):
(Enter boundary equations: e.g. "X'(0) = 10)
DE for T(t):
Transcribed Image Text:We will solve the heat equation u; = 2 uxx, 0 <x < 10, t >0 with boundary/initial conditions: u(0, г) 3D 0, ( 3, 0<x< 5 (0, 5<x< 10 and u(x, 0) = u(10, г) — 0, This models temperature in a thin rod of length L = 10 with thermal diffusivity a = 2 where the temperature at the ends is fixed at 0 and the initial temperature distribution is u(x, 0). For extra practice we will solve this problem from scratch. - Separate Variables. Assume u(x, t) = X(x) T(t) and split the PDE into two differential equations, one with X and one with T. = -A (Notation: Write X" and T' for derivatives. Place all constants in the differential equation with T). DE for X(x): = 0 Boundary conditions for X(x): (Enter boundary equations: e.g. "X'(0) = 10) DE for T(t):
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