arXiv subjects

Nanxian Chen

Publications and source records attributed to Nanxian Chen.

2 recordsLinked to original sources

arXiv2018

Note on Divergence of the Chapman-Enskog Expansion for Solving Boltzmann Equation

Within about a year (1916-1917) Chapman and Enskog independently proposed an important expansion for solving the Boltzmann equation. However, the expansion is divergent or indeterminant in the case of relaxation time $τ\geq 1$. Even since this divergence problem has puzzled this subject for a century. By using a modified Möbius series inversion formula, this paper proposes a modified Chapman-Enskog expansion with a variable upper limit of the summation. The new expansion can give not only a convergent summation but also provide the best-so-far explanation on some unbelievable scenarios occurred in previous practice.

physics.gen-ph↗

arXiv2014

Replying "the comment on Interlayer interactions in graphites"

For the moment, there is no exact description of van der Waals (vdW) interactions. ACFD-RPA \cite{Gould1} is expected to better describe vdW bonding, but it is not exact. The PBE/DFT-D2 method is less satisfactory, however, its results are in good agreement with experimental data. Although our fitting technique may weaken (not neglect) the vdW interactions and produce interlayer potentials with weakened vdW, the obtained interlayer potentials reproduce energetics of graphite near the equilibrium interlayer distance very well, as shown in Ref. \cite{Chen}. If having inputs which fully include vdW interactions and having better fitting functions, we believe that interlayer potentials can also fully include vdW interactions in graphite system.

cond-mat.mtrl-sci↗