The objective was to run an analysis of the ejector nozzle spanning the flight envelope. This analysis was part of the development of the XB-1 demonstrator.

Ejector nozzle analysis spanning the flight envelope (developed beside).

Meshes of 200-250 million cells were generated for a full-span model, and simulations were performed at cruise conditions to compare viscous results with lower fidelity preliminary design tools and inviscid simulations.

Overture wing/body and wing/body/nacelle simulations.

Results of 24 cases with 100 million cells were used to characterize the flow pumping characteristics of the ejector nozzle and helped match the flow schedules of the inlet and nozzle. Simulations with meshes of up to 100 million cells were run on 360 cores on Rescale.

Isolated ejector nozzle simulations, for solver verification, which when compared with the previous in-house approach yielded a percent difference of 0.1% for nozzle gross thrust coefficient at cruise.

These small cases were initially run on a laptop and later transitioned to the Rescale cloud computing platform as some of the first tests of the workflow. Inlet bleed plenum outflow venturi sizing and secondary flow path performance validation.Throughout the past year, several design studies used NUMECA solutions for both XB-1 and Overture, including: Adding to the reduction of computational resources, Boom has been able to take advantage of CPUBoosterв„ў, NUMECAвЂ™s unique convergence acceleration technique, for the majority of their runs. The unstructured hex-dominant meshing tool OMNISв„ў/Hexpress and the unstructured flow solver OMNISв„ў/Open-DBS with OpenLabsв„ў were selected for this task. Tim Conners, Lead Propulsion Engineer at Boom Supersonic The NUMECA partnership has given Boom the opportunity for significant savings in computational resources and a reduction in design cycle time. NUMECA solutions have not only advanced the development of the XB-1 subscale demonstrator by providing a dramatically streamlined and highly automated workflow, but the NUMECA partnership has given Boom the opportunity for significant savings in computational resources and a reduction in design cycle time.Д«oom managed to achieve results up to 14 times faster than with their previous design environment. In a pilot program with NUMECA, Boom managed to achieve results up to 14 times faster than with their previous design environment, according to Tim Conners, Lead Propulsion Engineer at Boom Supersonic. They also work with a very short time to concept, which means they need a solution that is fast to set up and even faster to get results. They will do this by limiting supersonic speeds solely to trans-oceanic flight segments and implementing the latest noise-reducing technologies to ensure no increase of existing noise contours during take-off and landing.Дue to the complexity of designing for supersonic speeds, Boom Supersonic engineers need to be able to test multiple conditions and try out many different design ideas. Mitigating the community's exposure to the noise of sonic booms is another priority.

One such innovation is its partnership with Prometheus Fuels, a company using clean energy to make zero-net carbon fuels out of carbon dioxide that is already in the atmosphere. To support this, Boom Supersonic plans to accommodate drop-in sustainable alternative fuels that will reduce their carbon footprint by roughly 80% and is actively looking at ways to incorporate environmentally minded innovations into Overture's design, without causing technical risk to their development timeline. The UNвЂ™s CORSIA climate agreement of carbon-neutral growth requires the offset of all international aviation emissions, whether subsonic or supersonic. Besides the challenges that supersonic flight inherently imposes, BoomвЂ™s Overture designers also need to consider important environmental and social factors. With pre-orders and options for 30 Overture airliners from Japan Airlines and Virgin Group already booked, the race is on to design the next generation supersonic plane. Overture will travel at a speed of Mach 2.2 and a cruising altitude of up to 60,000 feet. Authors: Michael Rybalko, Aeropropulsion Engineer, Boom Supersonic & Jean-Charles Bonaccorsi, Technical Director, NUMECA USAДЇounded in 2014 in Denver, Colorado, Boom Supersonic is redefining what it means to fly by building Overture, historyвЂ™s fastest commercial airliner.

Nozzle contour in gmsh