Study on an antagonist differentiated heated lid driven-cavity enclosing a tube: lattice Boltzmann method
Résumé
The method of lattice-Boltzmann multiple relaxation time (MRT) is commonly applied to study
the conversion system consisting in a combination of forced convection and natural convection occurred
in a cavity. Moving the top surface horizontally at a fixed speed, while two vertical walls are applied with
constant different temperatures, assuming adiabatic case on both bottom and top walls. We consider a
“non-cooperating” situation, where dynamics and buoyancy forces counterbalance. The cavity contains a
circular cylinder placed at various positions. Boundary conditions for velocity and temperature have been
applied to handle the non-Cartesian boundary of the cylinder. In lattice Boltzmann methods we adopt
the double distribution model for calculating both the thermal and hydrodynamic fields. The D2Q5 and
D2Q9 lattice are chosen to perform the simulations for a wide range of Reynolds and Rayleigh numbers.
By calculating the average Nusselt number, we also investigated the influence of different obstacle positions
on characteristics of flow and heat transfer. The results show the influence of the obstacle position on the
dimensionless numbers, so as to effect the heat transfer behaviors inside the cavity. It is also indicates that
the governing parameters are also related to driven power for the upper surface sliding.