Turbulent mixing is highly affected by uid compressibilty. The current work aims to study the effect of compressibility corrections for 3 different Reynold Averaged Navier Stokes (RANS) turbulence models namely the standard k-epsilon, RNG and Spalart Allmaras models using an in-house parallel three dimensional unstructued CFD solver to compute a high speed mixing layer. The experimental study done by Goebel and Dutton has been used as the benchmark for investigation. The standard k-∊ is compared with the RNG model to see the effect of the change in model coe cients on the predicted ow physics. The one equation Spalart Allmaras model is compared with the aforementioned two equation model to make the performance comparison complete. Turbulent quantities like rate of mixing layer growth, turbulence intensity and normalized Reynold's stress have been compared with benchmark results along with mean ow quantities like the self similar velocity profiles and their results have been presented. © ICCFD 2018.