Physical Review E
The equilibration rate for multispecies fluids is examined using thermal lattice Boltzmann simulations. Two-dimensional free-decay simulations are performed for effects of velocity shear layer turbulence on sharp temperature profiles. In particular, parameters are so chosen that the lighter species is turbulent while the heavier species is laminar-and so its vorticity layers would simply decay and diffuse in time. With species coupling, however, there is velocity equilibration followed by the final relaxation to one large co- and one large counter-rotating vortex. The temperature equilibration proceeds on a slower time scale and is in good agreement with the theoretical order of magnitude estimate of Morse [Phys. Fluids 6, 1420 (1963)].
Original Publication Citation
Vahala, L., Wah, D., Vahala, G., Carter, J., & Pavlo, P. (2000). Thermal lattice Boltzmann simulation for multispecies fluid equilibration. Physical Review E, 62(1), 507-516. doi: 10.1103/PhysRevE.62.507
Vahala, Linda L.; Wah, Darren; Vahala, George; Carter, Jonathan; and Pavlo, Pavol, "Thermal Lattice Boltzmann Simulation for Multispecies Fluid Equilibration" (2000). Electrical & Computer Engineering Faculty Publications. 58.