dimension       3
units           micro
atom_style      meso

variable        a equal 0.1             # lattice spacing         micrometers
variable        L equal $a*10
variable        T equal 300.
variable        kB equal 1.3806504e-8   # picogram-micrometer^2/(microsecond^2-Kelvin)
variable        rho_0 equal 1.          # density                   picograms/micrometer^3
variable        c_0 equal 10.           # speed of sound            micrometers/microsecond
variable        mu equal 1.             # dynamic viscosity         picogram/(micrometer-microsecond)
variable        h equal $a*4.0          # kernel function cutoff    micrometers
variable        mass equal $a*$a*$a*${rho_0}
variable        dt equal 5e-4           # timestep                  microseconds
variable        skin equal 0.1*$h

region          box block -$L $L -$L $L -$L $L units box
create_box      1 box
lattice         sc $a

create_atoms    1 box

mass            * ${mass}
set             group all meso/rho ${rho_0}

pair_style      sdpd/taitwater/isothermal $T ${mu} 76787    # temperature viscosity random_seed
pair_coeff      * * ${rho_0} ${c_0} ${h}

variable        vx_sq atom vx*vx
variable        vy_sq atom vy*vy
variable        vz_sq atom vz*vz
compute         v_sq all reduce ave v_vx_sq v_vy_sq v_vz_sq
variable        vx_sq_check equal c_v_sq[1]*${mass}/${kB}/$T
variable        vy_sq_check equal c_v_sq[2]*${mass}/${kB}/$T
variable        vz_sq_check equal c_v_sq[3]*${mass}/${kB}/$T

fix             1 all meso

neighbor        ${skin} bin
timestep        ${dt}

thermo          10
thermo_style    custom step time v_vx_sq_check v_vy_sq_check v_vz_sq_check

run             200