It seems to me that the Lennard Jones potential oversimplifies the more complex nature of van der Waals forces. However, in most of the MD simulation package, this is generally accepted.
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6$\begingroup$ Of course LJ is not precisely accurate, but it is computationally cheap. This makes it good enough for many applications. $\endgroup$ – Ivan Neretin Mar 8 '19 at 9:35
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