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 August 1st, 2017, 04:37 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 03:16 PM.
 August 1st, 2017, 08:22 AM #2 Senior Member   Joined: Jun 2015 From: England Posts: 915 Thanks: 271 I think you will find that the -1 refers to a sink, where the flow is leaving the plane of section Thanks from aows61
August 1st, 2017, 01:40 PM   #3
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Joined: Jul 2017
From: Iraq

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Quote:
 Originally Posted by studiot I think you will find that the -1 refers to a sink, where the flow is leaving the plane of section
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 03:17 PM.

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