The aim of this communication is to show how we have treated this issue, by coupling the two scales:
- microscopic in the zone where strong gradients exist, i.e combustion zone,
- macroscopic when the use of Darcy-Scale equations can be done.
Some results of microscale simulations will be given to explain the variety of regimes which can exist in combustion in porous media. Then, a method to estimate a global dispersion coefficient in the local equilibrium approach will be explained and some simulations performed using that coupling approach will be shown.