On the treatment of open boundary condition for radiative transfer equation

摘要

When the open boundary locates in the high-temperature zone and the temperature gradient is large, the error resulted from the open boundary to be treated as a black wall with local temperature may be very large and cannot be omitted. In order to get the reasonable numerical results, the open boundary needs to be set up far from the interesting zone more than 1.0 optical thickness if the open boundary of computational domain is treated as a black wall with local temperature. When the isothermal zone after the open boundary of computational domain is longer than 1.0 optical thickness, the errors resulting from taking the open boundary of computational domain as a black wall with local temperature are small, even if the open boundary of computational domain locates in high-temperature zone.