Boundary-layer transition on the surface of a space transportation vehicle highly influences the heat-flux the thermal protection system has to withstand in a re-entry scenario. Distributed surface roughness can cause cross-flow like vortices in the wake of the roughness patch that highly destabilize the flow regime. The variety of roughness parameters which influence the generation of a cross-flow vortex is addressed with the training of a Deep Neural Network. This paper presents a database of Direct Numerical Simulations (DNS) of a restricted domain of an Apollo-like space capsule with different distributed roughness patches. This study is using machine learning to predict the streamwise vorticity of a cross-flow-like vortex generated by a distributed random roughness patch. A sensitivity analysis identifies the importance of surface derivatives and the location of the maximum and minimum peak in the roughness patch.     «

Boundary-layer transition on the surface of a space transportation vehicle highly influences the heat-flux the thermal protection system has to withstand in a re-entry scenario. Distributed surface roughness can cause cross-flow like vortices in the wake of the roughness patch that highly destabilize the flow regime. The variety of roughness parameters which influence the generation of a cross-flow vortex is addressed with the training of a Deep Neural Network. This paper presents a data...     »