Molecular dynamics study of structure of clusters in supercritical Lennard–Jones fluid

Structure of supercritical fluid and its component clusters has been investigated by large-scale and long-time (N=10,976, t=1 ns) molecular dynamics calculations along an isotherm at T=1.03 Tc at various densities ranging from gas-like region to liquid-like one. Intra-cluster radial distribution function, distribution of angle formed by three molecules in the cluster, and asphericity parameter distribution function indicated bulky and fractal-like structure of the clusters. Clusters of the same size in the fluid at different densities showed almost the same structure independent of the fluid density.