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#--------------------calculate surface tension-----------------

variable            N       equal    100
variable            box     equal   (xhi-xlo)*(yhi-ylo)*(zhi-zlo)   # volume of the box

#--------------------surface tension(x-direction)--------------

compute             p  all stress/atom   NULL
compute             k  all reduce sum c_p[1] c_p[2] c_p[3]
variable            pn      atom   -c_p[1]
variable            pt      atom   -(c_p[2]+c_p[3])/2.0
variable            rk      atom   ((v_pn-v_pt)/(v_box/v_N))*((xhi-xlo)/v_N)*1.0e-2   # unit mN/m

#--------------------surface tension(global)-------------------

variable            tension   equal 0.5*(xhi-xlo)*(c_k[1]/v_box-(c_k[2]+c_k[3])/(2.0*v_box))*1.0e-2 # unit mN/m
fix                 mean      all   ave/time   100  5  1000  v_tension mode scalar  ave one file tension.dat

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