Help! P1 radiation model + multiphase
 

I can write UDF for implementing P1 radiation model to Fluent in a BFB reactor modeling. In this reactor there is a dense granular secondary phase (Euler). There is a P-1 type model in Fluent that takes under account dispersed particles. Can it be applied on the dense flow of a BFB (volume fraction of solids 0.3)? Is P-1 accurate in such flow?