Vibroacoustics Environment of a Hammerhead Payload Fairing on a Rocket with Volcano ScaLES скачать в хорошем качестве

Vibroacoustics Environment of a Hammerhead Payload Fairing on a Rocket with Volcano ScaLES

Transonic buffet is a long standing issue in the design of payload fairings for space launch vehicles. Despite over a half century of wind-tunnel and flight test experience, modern designs of payload fairings can still cause problems due to transonic buffet. A recent NASA "Lessons Learned" note from 2015 reiterates the difficulties in payload designs: "... is to avoid using (Reynolds-Averaged Navier Stokes CFD) codes which cannot check whether such behavior can occur...such codes are not capable of predicting the kinds of flow behavior that violating the NASA Guidelines can produce." Scale-resolving simulations such as those generated by the newly developed compressible Navier–Stokes solver, Volcano ScaLES, can accurately predict the complex transonic flow environment encountered by launch vehicles. The video shows a Wall-Modelled Large Eddy Simulations (WMLES) of a generic hammerhead payload fairing at Mach number 0.8. The simulation consists of 500 million cells and is performed in about two days on a desktop computer containing just two Nvidia RTX 4090 GPUs with 24 Gb of memory each. This represents a major breakthrough in scale-resolving simulations for launch vehicle buffet predictions making "supercomputer-class" calculations routine on readily available resources. Automated, predictive, and cost-effective simulation capability is critical to provide the vast amount of data needed to train AI/ML models for engineering decisions.