Hi espresso users,
At first my simulation didn't include LB, but now I am going to see the Hydrodynamic effects, so I turned on the LB like this:
#SETTING UP HYDRODYNAMICS
lbboundary cylinder center $c $c $c axis 0 0 1 radius $r length [expr $box_length/2] direction -1 penetrable thermostat lb 1.0
lbfluid dens 0.042 visc 33.22 agrid 1.0 tau 0.005
lbfluid friction 13.036
The parameters are water's, and I am almost sure that I calculated them correctly,
I want to ask some questions:
1. is it important to introduce lbboundary first, then lbfluid, or vice versa, or there is no difference?
2.Since I got some errors for cylinder violation, should I use reflecting 1 for lbboundary cylinder?
3. Without LB, the energy of my system is about -30000KT, though using LB increases the system's energy greaty to +3000KT, is it normal? Do you know what I did wrong?
4.Is the electrohydrodynamics used only when we have external electric field?
5.Do you think using remove_momentum will solve my problem, how can I use it in version 3.2.0?
I would really appreciate if someone can help me solving the problem.