The results of three-dimensional computational fluid dynamics model calculations are compared to available experimental results [V. D. Nikolaev, IEEE J. Quantum Electron. 38, 421 (2002)]. It is shown that the model is applicable to high pressure, ejector type chemical oxygen-iodine laser (COIL), reasonably reproducing the measured gain, temperature, static pressure, and gas velocity. A previous model, which included I2 (A′3 II2u), I2 (A3 II1u), and O 2 (a1 Δg, v) as significant intermediates in the dissociation of I2 [K. Waichman, J. Appl. Phys. 102, 013108 (2007)], reproduced the measured gain and temperature of a low pressure supersonic COIL. The previous model is complemented here by adding the effects of turbulence, which play an important role in high pressure COILs.