TY - JOUR
T1 - Two-Relaxation-Time Lattice Boltzmann Scheme: About Parametrization, Velocity, Pressure and Mixed Boundary Conditions
JO - Communications in Computational Physics
VL - 2
SP - 427
EP - 478
PY - 2008
DA - 2008/03
SN - 3
DO - http://doi.org/
UR - https://global-sci.org/intro/article_detail/cicp/7862.html
KW - 
AB - <p style="text-align: justify;">We develop a two-relaxation-time (TRT) Lattice Boltzmann model for hydrodynamic equations with variable source terms based on equivalent equilibrium
functions. A special parametrization of the free relaxation parameter is derived. It
controls, in addition to the non-dimensional hydrodynamic numbers, any TRT macroscopic steady solution and governs the spatial discretization of transient flows. In
this framework, the multi-reflection approach [16, 18] is generalized and extended for
Dirichlet velocity, pressure and mixed (pressure/tangential velocity) boundary conditions. We propose second- and third-order accurate boundary schemes and adapt them
for corners. The boundary schemes are analyzed for exactness of the parametrization,
uniqueness of their steady solutions, support of staggered invariants and for the effective accuracy in case of time dependent boundary conditions and transient flow.
When the boundary scheme obeys the parametrization properly, the derived permeability values become independent of the selected viscosity for any porous structure
and can be computed efficiently. The linear interpolations [5, 46] are improved with
respect to this property.</p>