Problem 51625. Solve an ODE: diffusion problem 2

Problem statement
In the solution of a problem involving diffusion, the following ordinary differential equation arises
f''+a(f+eta f') = 0
where a is a positive constant and primes denote differentiation with respect to the independent variable η. The function f and its derivatives vanish at infinity, and it is subject to the constraint
integral(f,{eta,-inf,inf}) = 1
Write a function to solve this problem—that is, return values of f at specified values of η.
Background
The physical problem involves diffusion of a quantity instantaneously injected at a point—for example, a spill of a contaminant in an initially clean river. The ODE results from transforming the diffusion equation—a partial differential equation in time and a spatial coordinate—with a similarity solution.

Solution Stats

55.56% Correct | 44.44% Incorrect
Last Solution submitted on Dec 10, 2023

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