This interface (), found under the Chemical Species Transport branch () > Reacting Flow in Porous Media multiphysics node () >  Moving Packed Bed group node, is used to model reactors where the bed, comprised of packed porous catalytic pellets, move relative to the reactor. The interparticle macropores (void between pellets), and the intraparticle micropores (pores inside the pellets) result in a system with bimodal porosity. The Transport of Diluted Species in Moving Packed Beds interface can be used to study interparticle and intraparticle mass transport, as well as reactions, while the solid pellet bed is moving downward, counter-currently to the moving fluid between pellets.

The main feature of the interface is the Packed Bed (Moving Packed Bed) node. With the Bed Type parameter being changed from Packed bed to Moving packed bed, the Transport of Diluted Species in Packed Beds interface switches to the Transport of Diluted Species in Moving Packed Beds interface. For the Transport of Diluted Species in Moving Packed Beds interface, there is an extra convection term in the mass transport governing equation,

See The Transport of Diluted Species in Packed Beds Interface.