High-fidelity numerical results have been obtained for low-disturbance wind-tunnel tests of transitional flow including isolated, discrete roughness elements on a seven-degree half-angle cone. Solutions for a range of roughness heights, two angles of attack, and several levels of introduced disturbances were calculated using a wall-resolved high-order implicit large eddy simulation methodology. It was found that the roughness elements did cause transition to turbulence in a manner similar to the experimental data. With no perturbations added, transition occurs downstream of the experimentally observed location. The addition of perturbations changes the transition location to more closely match the experimental data, in keeping with trends seen in the wind-tunnel.
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