- #1
Larsson
- 28
- 0
solve the Helmholtzequation laplace(u) + lamda*u = 0 in the unit circle with neumann condition for r = 1
I don't get very far on this problem. What I start with is rewriting the problem with how laplace looks in this case.
laplace(u) = (1/r) d/dr(r * du/dr) + (1/r^2) * d^2u/dtheta^2)
so the equation will be
R'/R + rR''/R + theta''/(r*theta) + lambda = 0
but that's as far as I get
I don't get very far on this problem. What I start with is rewriting the problem with how laplace looks in this case.
laplace(u) = (1/r) d/dr(r * du/dr) + (1/r^2) * d^2u/dtheta^2)
so the equation will be
R'/R + rR''/R + theta''/(r*theta) + lambda = 0
but that's as far as I get