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Comparison of the Ausm(+) and H-Cusp Schemes for Turbomachinery Applications

Comparison of the Ausm(+) and H-Cusp Schemes for Turbomachinery Applications


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About the Book

Many turbomachinery CFD codes use second-order central-difference (C-D) schemes with artificial viscosity to control point decoupling and to capture shocks. While C-D schemes generally give accurate results, they can also exhibit minor numerical problems including overshoots at shocks and at the edges of viscous layers, and smearing of shocks and other flow features. In an effort to improve predictive capability for turbomachinery problems, two C-D codes developed by Chima, RVCQ3D and Swift, were modified by the addition of two upwind schemes: the AUSM+ scheme developed by Liou, et al., and the H-CUSP scheme developed by Tatsumi, et al. Details of the C-D scheme and the two upwind schemes are described, and results of three test cases are shown. Results for a 2-D transonic turbine vane showed that the upwind schemes eliminated viscous layer overshoots. Results for a 3-D turbine vane showed that the upwind schemes gave improved predictions of exit flow angles and losses, although the HCUSP scheme predicted slightly higher losses than the other schemes. Results for a 3-D supersonic compressor (NASA rotor 37) showed that the AUSM+ scheme predicted exit distributions of total pressure and temperature that are not generally captured by C-D codes. All schemes showed similar convergence rates, but the upwind schemes required considerably more CPU time per iteration. Chima, Rodrick V. and Liou, Meng-Sing Glenn Research Center NASA/TM-2003-212457, E-13996, NAS 1.15:212457, AIAA Paper 2003-4120


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Product Details
  • ISBN-13: 9781721578061
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Height: 279 mm
  • No of Pages: 34
  • Spine Width: 2 mm
  • Width: 216 mm
  • ISBN-10: 1721578064
  • Publisher Date: 20 Jun 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 104 gr


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