dimension          2
units              si
atom_style         meso

# create simulation box
region             box block -0.050e-3 1.044e-3 -0.05e-3 1.044e-3 -1.0e-6 1.0e-6 units box
create_box         3 box

# create fluid particles
region             fluid block 0.0001e-3 0.999e-3 0.0001e-3 0.999e-3 EDGE EDGE side in units box 
lattice            sq 0.025e-3
create_atoms       1 region fluid

# create bottom, left, and right wall
region             walls block 0.0001e-3 0.999e-3 0.0001e-3 EDGE EDGE EDGE side out units box 
lattice            sq2 0.025e-3
create_atoms       2 region walls

# create a driver strip of particles, which exerts shear forces on the fluid
region             driver block EDGE EDGE 0.999e-3 EDGE EDGE EDGE side in units box 
create_atoms       3 region driver

group              fluid type 1 
group              walls type 2 
group              driver type 3
group              integrate_full union fluid driver

mass               3 2.0e-7
mass               2 2.0e-7
mass               1 4.0e-7
set                group all meso_rho 1000.0

# use Tait's EOS in combination with Morris' laminar viscosity.
# We set rho_0 = 1000 kg/m^3, c = 0.1 m/s, h = 6.5e-5 m.
# The dynamic viscosity is set to 1.0e-3 Pa s, corresponding to a kinematic viscosity of 1.0e-6 m^2/s
pair_style         hybrid sph/taitwater/morris
pair_coeff         * *    sph/taitwater/morris 1000 0.1 1.0e-3 6.5e-5
pair_coeff         2 3    none # exclude interaction between walls and shear driver

compute            rho_peratom all meso_rho/atom
compute            e_peratom all meso_e/atom
compute            ke_peratom all ke/atom
compute            esph all reduce sum c_e_peratom
compute            ke all ke
variable           etot equal c_ke+c_esph

# assign a constant velocity to shear driver
velocity           driver set 0.001 0.0 0.0 units box
fix                freeze_fix driver setforce 0.0 0.0 0.0

# do full time integration for shear driver and fluid, but keep walls stationary
fix                integrate_fix_full integrate_full meso
fix                integrate_fix_stationary walls meso/stationary

dump               dump_id all custom 100 dump.lammpstrj id type xs ys zs vx vy c_rho_peratom c_e_peratom
dump_modify        dump_id first yes
thermo             100
thermo_style       custom step c_esph v_etot
thermo_modify      norm no

neighbor           3.0e-6 bin
timestep           5.0e-5
run                4000
