3. Consider the heat equation in a two-dimensional rectangular region 0

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter11: Topics From Analytic Geometry
Section: Chapter Questions
Problem 30RE
Question

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3. Consider the heat equation in a two-dimensional rectangular region
0<x<L, 0 < y < H.
ди
J²u
J²u
= k
Ət
მე2
მყვ
subject to the initial condition
u(x, y, 0) = f(x, y).
Solve the initial value problem and analyse the temperature as t→ ∞, if the
boundary conditions are
ди
ди
ди
ди
(0, y, t) = 0,
(L, y, t) = 0,
(x, 0,t) = 0,
(x, H,t) = 0.
მე
Əx
მყ
მყ
Note:
You may assume without derivation that product solutions
u(x,y,t) = (x, y)h(t) = f(x)g(y)h(t) satisfy
dh
-Xkh,
dt
and the two-dimensional eigenvalue problem V2 + λ = 0 with further
separation
df
dx²
d²g
-μf,
+(λ - µ)g=0,
dy2
or you may use results of the two-dimensional eigenvalue problem.
Transcribed Image Text:3. Consider the heat equation in a two-dimensional rectangular region 0<x<L, 0 < y < H. ди J²u J²u = k Ət მე2 მყვ subject to the initial condition u(x, y, 0) = f(x, y). Solve the initial value problem and analyse the temperature as t→ ∞, if the boundary conditions are ди ди ди ди (0, y, t) = 0, (L, y, t) = 0, (x, 0,t) = 0, (x, H,t) = 0. მე Əx მყ მყ Note: You may assume without derivation that product solutions u(x,y,t) = (x, y)h(t) = f(x)g(y)h(t) satisfy dh -Xkh, dt and the two-dimensional eigenvalue problem V2 + λ = 0 with further separation df dx² d²g -μf, +(λ - µ)g=0, dy2 or you may use results of the two-dimensional eigenvalue problem.
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