The resolved flow field from computational fluid dynamics simulations using various turbulence models are compared to experimental measurements of a dualimpinging jet flowfield taken at the Penn State University high speed jet aeroacoustic facility. The goal of the effort is to understand the outwash pattern produced by dual impinging ‘jets. The computational model is validated by comparing the CFD results to experimental measurements in three studies: (1) pressure measurements in a free supersonic jet plume, (2) impingement pattern produced on the a ground plane and (3) shock formation in a supersonic jet impinging at different distances away from the nozzle exit. For the present case, freejetflow dynamics are found to be highly dependant on the turbulence model and the nozzle shape. For the freejet condition and an approximate nozzle, the SpalartAllmaras turbulence model in an unsteady flow model provided the closest match to the experimental measurements (as compared to an unsteady Reynoldsstress transport model and a steady SpalartAllmaras model). In the secondary flow, behavior related to the outwash produced by the twin, impinging jets interacting is observed. The turbulence model sensitivity in this part of the flow may indicate another difficulty for turbulence modeling.