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August 1st, 2017, 05:37 AM  #1 
Newbie Joined: Jul 2017 From: Iraq Posts: 18 Thanks: 0  Inner Boundary Condition
Q:/ What is the reason for letting the inner boundary condition = (1) when solving the radial flow of infinite form of diffusivity equation, and I would like to know what would happen if I didn't equate it with (1). As in the attached pic: https://i.imgur.com/AVesmHM.png and here is the original pdf if you want: http://www.pe.tamu.edu/blasingame/da..._DimLssVar.pdf Last edited by skipjack; August 1st, 2017 at 04:16 PM. 
August 1st, 2017, 09:22 AM  #2 
Senior Member Joined: Jun 2015 From: England Posts: 704 Thanks: 202 
I think you will find that the 1 refers to a sink, where the flow is leaving the plane of section

August 1st, 2017, 02:40 PM  #3 
Newbie Joined: Jul 2017 From: Iraq Posts: 18 Thanks: 0  Thanks, but I don't think the (1) refers to sink term; I think it is more related to mathematical convenience, but I don't know the exact/detailed explanation of it.
Last edited by skipjack; August 1st, 2017 at 04:17 PM. 

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