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Three stage transonic compressor

Working with Siemens Industrial Turbomachinery to produce a state-of-the-art time-accurate simulation of a compressor test rig.


  • 32 NVIDIA Tesla C1060 GPUs
  • 24 hours per revolution
  • 160 million grid nodes

The complete rig is simulated on the University of Cambridge's Darwin GPU supercomputer, including both the inlet struts and the three downstream stages. Five 360 degree revolutions are required in this case to obtain a periodic solution

The aim here is to study the unsteady forces on the blades due to rotor-stator interactions. There are two contributions to this effect:

  • the moving potential field of the rotors
  • the downstream propagation of the blade wakes

The latter effect can be seen in the figure, which shows the entropy function at mid-span. The wakes from a given blade row can still be made out even several blade rows downstream, and significant unsteadiness resulting from the mixing of the wakes is observed in the last two stages.


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