Double-layer flared disk model used in our simulations, after Chiang & Goldreich (1997). In our model the following emission components are included: the optically thin atmosphere emission, with a temperature T_atm above the optically thick disk interior, with the temperature T_int; the continuum emission of the rounded-off disk inner rim, with a temperature T_rim and the stellar continuum assumed to be a blackbody with a temperature T_∗. The accretion heating of disk interior is also accounted for.