lattice boltzmann simulation of mixed convection heat transfer in eccentric annulus

mixed convection heat transfer in eccentric annulus was simulated numerically by lattice boltzmann model (lbm) based on multi-distribution function double-population approach. the effect of eccentricity on heat transfer at various locations was examined at ra = 10⁴ and σ = 2. velocity and temperature distributions as well as nusselt number are obtained. the results are validated with published results and shown that multi-distribution function approach can evaluate the velocity and temperature fields in curved moving boundaries with a good accuracy in comparison with the previous studies. the results show that the average nusselt number increases when the inner cylinder moves downward regardless of the radial position.