['DPD', 'was', 'first', 'proposed', 'in', 'order', 'to', 'recover', 'the', 'properties', 'of', 'isotropy', '(', 'and', 'Galilean', 'invariance', ')', 'that', 'were', 'broken', 'in', 'the', 'so', '-', 'called', 'lattice', '-', 'gas', 'automata', 'method', '[', '5', ']', '.']