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[ESPResSo-users] unstable solution flow profile

From: Wink, Markus
Subject: [ESPResSo-users] unstable solution flow profile
Date: Tue, 25 Mar 2014 13:09:25 +0000

Dear all,


while doing simulations on the flow profile in a slit structure, I have found out that the velocity profile as a function of the grid size becomes unstable. For example, if I choose a width of 50 microns, a force density of 64000N/m^3 and a dynamic viscosity of 0.000125 kg/(ms), the LB-nodes near the maximum velocity starts oscillating and the profile collapses, when the grid size is set to 1. When I start a simulation using a grid size of 0.5, the solution is stable.


I was wondering, why that is the case. I mean, what is the physical reason for that and why does it happen near the maximum? I mean, I can deal with that problem, but I am really curios to know, what the reason is. Attached you will find the two flow profiles.


Thanks a lot.






Attachment: stable_unstable.png
Description: stable_unstable.png

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