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Boundary Condition

by mhmonon
Tags: boundary, condition
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mhmonon
#1
Nov1-09, 09:46 AM
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
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tiny-tim
#2
Nov1-09, 11:15 AM
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Hi mhmonon! Welcome to PF!
Quote Quote by mhmonon View Post
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!
FredGarvin
#3
Nov1-09, 12:10 PM
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You need to be more precise with what you are doing. That will directly influence what the BCs are.

mhmonon
#4
Nov1-09, 03:48 PM
P: 5
Boundary Condition

here I attached the equation with the boundary value.
Please see the attachment.
Attached Files
File Type: pdf boundaryvalue.pdf (11.3 KB, 14 views)
FredGarvin
#5
Nov1-09, 08:59 PM
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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?
mhmonon
#6
Nov1-09, 09:08 PM
P: 5
actually it is a wave diffusion equation in hollow cylindrical problem.. I think I can solve this problem.
HallsofIvy
#7
Nov2-09, 04:23 AM
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that is the equation for r, after you have separted variables r and [itex]\theta[/itex]. One "unstated" boundary condition is that the function must be finite at r= 0. That gives you one of your constants immediately.
mhmonon
#8
Nov2-09, 08:04 AM
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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