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Coupled airframe and engine fan

Fully coupled, unsteady simulation at high aircraft angle of attack

  • 32 NVIDIA P100 GPUs
  • 8 hours per fan revolution
  • 200 million grid nodes

This simulation uses the NASA Common Research Model (CRM) aircraft with NASA Stage 67 acting as an engine fan. The aircraft operates at a high angle of attack, leading to a flow separation from part of the wing and a high incidence onto the engine intake. This alters the fan performance and operability. Using an unsteady simulation enables accurate prediction of the fan performance and stall inception at this off-design condition. 

An unstructured grid is used for the aircraft and far-field while a high-quality structured grid is used for the fan stage. Fast, fully unstructured sliding planes are used to connect the aircraft and engine domains at the engine inlet and outlet.

One of the next key steps in aerodynamic design is to allow for complex coupling effects between multiple components in the design cycle, like the off-design engine-airframe interaction shown here. Turbostream enables this by supporting a wide range of unstructured grids, fully optimised for running on GPUs, with powerful pre- and post-processing workflows to handle large unsteady data sets.

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