Added 2d example

git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@14458 f3b2605a-c512-4ea7-a41b-209d697bcdaa

examples/voronoi/in.voronoi.2d

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+# Test volume definitions for 2d and finite systems
+
+variable        rcut equal 10.0
+variable        rskin equal 2.0
+variable        rcomm equal 20.0
+variable        len equal 4.0
+variable        lenz equal 10.0
+
+dimension       2
+units		metal
+boundary	p p p
+
+#lattice         sq 1.0 origin 0.5 0.5 0.0
+lattice         hex 1.0 origin 0.5 0.5 0.0
+
+atom_style	atomic
+
+region          box block 0 ${len}  0 ${len} 0.0 ${lenz}
+region          atoms block 0 ${len}  0 ${len} 0.0 0.0
+create_box      1 box
+create_atoms    1 region atoms
+
+mass 		1 1.0
+
+pair_style      lj/cut ${rcut}
+pair_coeff      1 1 0.0 1.0 
+
+neighbor	${rskin} nsq
+neigh_modify	delay 10
+
+# set the minimum communication cut-off 
+comm_modify     cutoff ${rcomm}
+
+thermo 		1
+
+#
+# TEST 1: Volume check for 2d bulk system
+#
+
+compute 	v1 all voronoi/atom
+dump    	d1 all custom 1 dump.voro id type x y z c_v1[1] c_v1[2]
+compute 	volvor all reduce sum c_v1[1]
+variable 	volsys equal lz*lx*ly
+variable 	err equal c_volvor-v_volsys
+thermo_style 	custom c_volvor v_volsys vol v_err
+run  		0
+
+#
+# TEST 2: Volume check for 2d finite system
+#         add margins in x and y directions
+#
+
+change_box 	all boundary f f p
+variable 	rless equal ${rcomm}<(${rcut}+${rskin})
+variable 	rmargin equal 0.01+${rcomm}*!${rless}+(${rcut}+${rskin})*${rless}
+variable 	volsys equal (lx+2*${rmargin})*(ly+2*${rmargin})*lz
+run  		0