Problem 1: Consider an infinite slab of unit width. The differential equation describing the system is d?T dT dT 0 = +g(z) = 0 = 0 dz? dz dz z=1 g(z) = 10 – 20z 1) Show that the following function are eigenfunctions of the linear transformation: $,(z) = H, cos(@,z), where @, = (i – 1)x , H1 1, Н. 12. Determine the corresponding eignenvalues. 2) Using 4 eigenfunctions , (z) = H, cos(@,z), where a, = (i– 1)T , H1 = 1, H¡ = /2, i 2...4, approximate the differential equation with a set of algebraic equations using the Galerkin method. Report your answer in the form of Ax = b by identifying x, A and b

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Chapter2: Second-order Linear Odes
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Problem 1: Consider an infinite slab of unit width. The differential equation describing the
system is
d?T
dT
dT
= 0
dz? +8(z)
dz
dz
z=0
Iz=1
g(z) = 10– 20z
Show that the following function are eigenfunctions of the linear transformation:
$,(z) = H, cos(@,z), where @, = (i – 1)7, H1 = 1, H;
12. Determine the
corresponding eignenvalues.
2) Using 4 eigenfunctions o, (z) = H, cos(@,z), where w, = (i– 1)7, H1 = 1, H¡ = /2, i =
%3D
%3D
2...4, approximate the differential equation with a set of algebraic equations using the
Galerkin method. Report your answer in the form of Ax =b by identifying x, A and b
and indicating how an approximation of T(z) can be constructed from x. You should
find the following identity useful
cos(@z), z sin(@ z)
Szcos(@2)dz =
3) Show that the solution to the system of equations from part 1 is
T(z) = a, +(b, / n' )¢,(z)+(b, / 4n² )¢,(z)+(b, /9n² )¢,(z)
%3D
where b; are element of the vector b and a, is any arbitrary number. Using MATLAB,
plot T(z) with a, = 303.
4) Repeat part 1 with g(z) = 10 and show that the resulting set of algebraic equations has
no solution. Discuss this conclusion in the context of Example 2.13 from the book
(Graham and Rawlings).
Transcribed Image Text:Problem 1: Consider an infinite slab of unit width. The differential equation describing the system is d?T dT dT = 0 dz? +8(z) dz dz z=0 Iz=1 g(z) = 10– 20z Show that the following function are eigenfunctions of the linear transformation: $,(z) = H, cos(@,z), where @, = (i – 1)7, H1 = 1, H; 12. Determine the corresponding eignenvalues. 2) Using 4 eigenfunctions o, (z) = H, cos(@,z), where w, = (i– 1)7, H1 = 1, H¡ = /2, i = %3D %3D 2...4, approximate the differential equation with a set of algebraic equations using the Galerkin method. Report your answer in the form of Ax =b by identifying x, A and b and indicating how an approximation of T(z) can be constructed from x. You should find the following identity useful cos(@z), z sin(@ z) Szcos(@2)dz = 3) Show that the solution to the system of equations from part 1 is T(z) = a, +(b, / n' )¢,(z)+(b, / 4n² )¢,(z)+(b, /9n² )¢,(z) %3D where b; are element of the vector b and a, is any arbitrary number. Using MATLAB, plot T(z) with a, = 303. 4) Repeat part 1 with g(z) = 10 and show that the resulting set of algebraic equations has no solution. Discuss this conclusion in the context of Example 2.13 from the book (Graham and Rawlings).
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