How to set the heat conductivity and thermal diffusion coefficient in LB simulation?

Lattice Boltzmann Method LBM: Theory
#1

Hi, everyone,
In thermal LB simulation, the thermal diffusion coefficient can determine the temperature field, but how to get or set the heat conductivity?
I am very confused about this.
Looking forward for your help.

#2

How to set the interface condition:k[sub]s[/sub]dT[sub]1[/sub]=k[sub]f[/sub]dT[sub]2[/sub]?

#3

Hi Nash,

For D2Q9 model, thermal diffusivity for diffusion problem can be set with the help of 
D=(1/3) x (tau-0.5) x (deltax)^2/ (deltat)
where, D= Diffusion coefficient
           tau= relaxation time
           deltax= distance between nodes
           deltat= time step