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[ESPResSo-users] Particle in Fluid, periodic boundary conditions

From: Wink, Markus
Subject: [ESPResSo-users] Particle in Fluid, periodic boundary conditions
Date: Mon, 24 Nov 2014 18:12:34 +0000

Hello everybody,


I performed a simple simulation of a particle in a LB fluid. While checking the trajectory of the particle, I noticed a strange behavior. So I put the particle close to the wall and I see a movement towards the middle of the channel. This is expected due to the lift force. Nevertheless, I notice a break-in of the z-component, whenever the particle reaches the end of the microchannel (at position 100). So every time the periodic boundary condition takes place for the particle, I notice that behavior. Does anyone of you noticed the same behavior and can explain it to me? It seems, that the periodic boundary condition in the LB Fluid doesn’t work. If I remove the fluid I don’t see that.


Can anyone help me with that? Attached you will find the script as well as a figure, showing the z-coordinate as function of the position of the particle (the x-component seems to be fine).






Attachment: boundaries.tcl
Description: boundaries.tcl

Attachment: periodic_LB.tcl
Description: periodic_LB.tcl

Attachment: trajectory_raw.png
Description: trajectory_raw.png

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