Effect of steady forcing mechanisms on bolt geometry for flight conditions

We investigate the effect of realistic distributed roughness and variable wall temperature on the BoLT geometry at flight conditions. Utilizing a Fourier filtering method, we mimic the roughness commonly measured on machined surfaces. The resulting flowfields are compared with that obtained from a randomly distributed roughness. Our analysis demonstrates that the distribution of roughness has considerable effect on the observed flow features. In addition to this, we also investigate the effect of variable wall temperature due to conjugate heat transfer along the flight trajectory. A loosely coupled conjugate heat transfer simulation is performed to quantify this effect on the wall temperature. Our results show that variable wall temperature increases the boundary layer thickness and considerably modifies the flow structures along the centerline.