# Boundary Condition

by mhmonon
Tags: boundary, condition
 P: 5 Hi all, I am facing difficulties about boundary condition in Hollow Cylinder. its like wave diffusion equation in hollow cylinder. can anyone help me out to solve this problem. I need some good reverences. Thank you
HW Helper
Thanks
P: 26,157
Hi mhmonon! Welcome to PF!
 Quote by mhmonon Hi all, I am facing difficulties about boundary condition in Hollow Cylinder. its like wave diffusion equation in hollow cylinder. can anyone help me out to solve this problem. I need some good reverences. Thank you
We're all very reverend here.

Show us how far you got, and where you're stuck, and then we'll know how to help!
 Sci Advisor P: 5,095 You need to be more precise with what you are doing. That will directly influence what the BCs are.
P: 5
Boundary Condition

here I attached the equation with the boundary value.
Attached Files
 boundaryvalue.pdf (11.3 KB, 14 views)
 Sci Advisor P: 5,095 I think your nomenclature is a bit different than what I am used to seeing. You are solving a PDE for the velocity potential, correct? Your boundary conditions are on omega which is usually circular frequency. Is that correct?
 P: 5 actually it is a wave diffusion equation in hollow cylindrical problem.. I think I can solve this problem.
 Math Emeritus Sci Advisor Thanks PF Gold P: 39,345 that is the equation for r, after you have separted variables r and $\theta$. One "unstated" boundary condition is that the function must be finite at r= 0. That gives you one of your constants immediately.
 P: 5 hi HallsofIvy, Thanks for your reply. Yep you are right. But I am facing here another problem. The problem is that I have no condition at r=0; Instead of r=0 I have another condition that is ri(internal radius)=0. So I can not eliminate one. Bye

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