Added examples for body rounded/polygon

LAMMPS data file for polygons: squares of edge length L: Izz = 1/6mL^2

2 atoms

2 bodies

1 atom types

-6 6 xlo xhi

-6 6 ylo yhi

-0.5 0.5 zlo zhi

Atoms

1 1 1 1 0 0 0

2 1 1 1 5 1 0

Bodies

1 1 19

4

1 1 2.67 0 0 0

-2 -2 0

-2 2 0

2 2 0

2 -2 0

0.5

2 1 19

4

1 1 2.67 0 0 0

-2 -2 0

-2 2 0

2 2 0

2 -2 0

0.5

# 2d rounded polygon bodies

variable    r     index 3

variable    steps index 100000

variable    T     index 0.5

variable    P     index 0.2

variable    seed  index 980411

units       lj

dimension   2

atom_style  body rounded/polygon 1 6

atom_modify map array

read_data   data.squares

replicate   $r $r 1

velocity    all create $T ${seed} dist gaussian mom yes rot yes

variable cut_inner  equal 0.5

variable k_n        equal 100

variable k_na       equal 2

variable c_n        equal 0.1

variable c_t        equal 0.1

variable mu         equal 0.1

variable delta_ua   equal 0.5

pair_style body/rounded/polygon ${c_n} ${c_t} ${mu} ${delta_ua} ${cut_inner}

pair_coeff * * ${k_n} ${k_na}

comm_modify vel yes

neighbor     0.5 bin

neigh_modify every 1 delay 0 check yes

timestep     0.001

#fix         1 all nve/body

#fix         1 all nvt/body temp $T $T 1.0

fix          1 all npt/body temp $T $T 1.0 x 0.001 $P 1.0 &

             y 0.001 $P 1.0 couple xy

fix          2 all enforce2d

compute      1 all body/local id 1 2 3

dump         1 all local 100000 dump.polygon.* index c_1[1] c_1[2] c_1[3] c_1[4]

thermo_style custom step ke pe etotal press

thermo       1000

restart      100000 restart1.bin restart2.bin

#dump	     2 all image 10000 image.*.jpg type type zoom 2.0 adiam 1.5 body yes 0 0

#dump_modify  2 pad 6

run   	     ${steps}