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[ESPResSo-users] flow profile square duct - deviation

From: Wink, Markus
Subject: [ESPResSo-users] flow profile square duct - deviation
Date: Tue, 20 Jan 2015 10:46:09 +0000

Hello everybody,


I performed a simple simulation of a poiseuille flow in a microfluidic square duct. I wanted to check, whether the simulated profile matches with the theoretical one (I found the formula in frank M. White’s “Viscous Fluid Flow”).


The simulated values matches the theoretical ones quite good in the middle of the channel. Strangely enough, I have a quite big deviation close to walls of the channel (the last fluid node closest to the boundary nodes), which is even worse in the corners of the channel (about 42% deviation (!!) ). I was wondering, where this deviation comes from. Attached you will find the simulation script as well as the plots showing the deviation.


Does anyone have a clue, where the deviation comes from?







Attachment: boundaries.tcl
Description: boundaries.tcl

Attachment: simulation.tcl
Description: simulation.tcl

Attachment: plots.pdf
Description: plots.pdf

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