  We study the structure of stationary channel flows predicted by the
regularized 13-moment equations. Compared with the previous work [P. Taheri et
al., Phys. Fluids, 21 (2009), 017102], we focus on gases whose molecules
satisfy the general inverse power law. The analytical solutions are obtained
for the semi-linear equations, and the structures of Couette, Fourier, and
Poiseuille flows are solved by coupling the general solutions with newly
derived boundary conditions. The results show excellent agreement with the
reference solution in the slip-flow regime. Our results also show that the R13
equations derived from inverse power law models can have better accuracy than
the R13 equations of Maxwell molecules with altered viscosity.
