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[ESPResSo-users] Tube Flow Lattice Boltzmann

From: Wolfgang Riefler
Subject: [ESPResSo-users] Tube Flow Lattice Boltzmann
Date: Thu, 18 Apr 2013 14:45:55 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130105 Thunderbird/17.0.2

Hello all,

I am trying to simulate a flow within a cylindrical tube, using the Lattice Boltzmann method.

I am using the following script:

setmd box_l 54 18 18
setmd time_step 0.005
setmd skin 0.1

lbfluid agrid 1 dens 1 visc 10 tau 0.005 ext_force 0.04
thermostat lb 0.0

lbboundary cylinder center 27.0 9.0 9.0 axis 1.0 0.0 0.0 radius 8.26 length 27 direction -1

integrate x

According to the user guide this should define a cylindircal surface with symmetry axis parallel to the x-axis, where all nodes outside the cylinder are defined as boundary nodes.

However the fluid stays inert. If I change the direction to 1, I can see the fluid flow outside the cylinder in x-direction as expected.

What am I doing wrong?

Thanks in advance,


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