Unsteady RANS computation was conducted to investigate vortical flow over the ONERA 70-degree delta wing at a high angle of attack. Using k-w shear-stress transport(SST) and Spalart-Allmaras(SA) turbulence model, a comparative study is presented with experimental data on the same grid and computation condition. SA model predicts well the pressure coefficient distribution. whereas the axial velocity and vorticity variation along the vortex core are not well predicted with the SA model.