Re: [ESPResSo-users] Simulation of fluid using LB-method

[Wink, Markus]

Hello,

Well in the case of the a_grid=0,5 I chose in my tcl-script:

"
set l 51.5
setmd box_l $l $l $l
[...]
set agrid 0.5

lbboundary wall normal 0 0 1 dist [expr 1.5*$agrid]
lbboundary wall normal 0 0 -1 dist [expr -$l+1.5*$agrid]

[...]
"

So I changed it, didn't I. Still puzzled, why it doesn't work.

Markus Wink



-----Ursprüngliche Nachricht-----
Von: address@hidden [mailto:address@hidden Im Auftrag von Ulf Schiller
Gesendet: Donnerstag, 30. Januar 2014 15:12
An: address@hidden
Betreff: Re: [ESPResSo-users] Simulation of fluid using LB-method

On 01/30/2014 03:03 PM, Wink, Markus wrote:
> Hello everybody,
>
> I tried to think about of the real position of the wall:
> "The (0, 0, 0) node of the LB lattice in Espresso is placed at (agrid/2, 
> agrid/2, agrid/2)."
> In my case, I chose a_grid =1, so I put the walls at 1.5 and 51.5 in the 
> simulation box. Thus the length of the simulation box is 53 in my case, 
> gibing a channel width of 50.

In that case the actual locations are 2.0 and 51.0, if I'm not mistaken 
(Georg?). Then the width is 49.0 which would bring your v_max*50/49 
close to the theoretical value.

Best,
Ulf

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