A GPU-based line-by-line method for thermal radiation transfer of H2O, CO2, and H2O/CO2 mixture

Abstract

The thermal radiation characteristic of H2O/CO2 mixture in combustion system under high pressure was complex. In order to character its radiation heat transfer, a parallel Line-by-Line method was established to study the thermal radiation characteristic by GPU. The radiation heat transfer was investigated with HITRAN2012 database under the isothermal homogeneous and non-isothermal non-uniform conditions in one-dimensional planar enclosure. The thermal radiation of the pressurized oxy-fuel flame with the dry flue gas recirculation under different pressure were discussed. The results showed that the parallel calculation method had significant accuracy and high computational efficiency. The maximum relative error of computing total emissivity for gas mixture was 6.36%. The parallel method can provide a speedup ratio of 80 by GPU. The difference between the HITRAN and HITEMP was small. With the pressure went up, the parallel method had better computational efficiency than LBL model based on CPU for thermal radiation transfer. The speedup ratio reached 100. The parallel calculation method was completely applicable to study radiation heat transfer of combustion system or model in CFD.