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Vortex shedding past square cylinder Vortex shedding past square - PowerPoint PPT Presentation

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Vortex shedding past square cylinder Vortex shedding past square cylinder URANS (K-Omega SST with no wall functions) LES (Smagorinsky) Vortices visualized by Q-criterion Vortices visualized by Q-criterion

  1. Vortex shedding past square cylinder

  2. Vortex shedding past square cylinder URANS (K-Omega SST with no wall functions) – LES (Smagorinsky) – Vortices visualized by Q-criterion Vortices visualized by Q-criterion www.wolfdynamics.com/wiki/squarecil/les.gif www.wolfdynamics.com/wiki/squarecil/urans2.gif Laminar (no turbulence model) – Vortices DES (SpalartAllmarasDDES) – Vortices visualized by visualized by Q-criterion Q-criterion www.wolfdynamics.com/wiki/squarecil/laminar.gif www.wolfdynamics.com/wiki/squarecil/des.gif

  3. Vortex shedding past square cylinder Turbulence model Drag coefficient Strouhal number Computing time (s) Laminar 2.81 0.179 93489 LES 2.32 0.124 77465 DES 2.08 0.124 70754 SAS 2.40 0.164 57690 URANS (WF) 2.31 0.130 67830 URANS (No WF) 2.28 0.135 64492 RANS 2.20 - 28246 (10000 iter) Experimental values 2.05-2.25 0.132 - Note: all simulations were run using 4 cores . References: D. A. Lyn and W. Rodi. “The flapping shear layer formed by flow separation from the forward corner of a square cylinder”. J. Fluid Mech., 267, 353, 1994. D. A. Lyn, S. Einav, W. Rodi and J. H. Park. “A laser -Doppler velocimetry study of ensemble-averaged characteristics of the turbulent near wake of a square cylinder”. Report. SFB 210 /E/100.

  4. DLR-F6 aircraft model – RANS simulation

  5. DLR-F6 aircraft model – RANS simulation

  6. DLR-F6 aircraft model – RANS simulation

  7. DLR-F6 aircraft model – RANS simulation

  8. DLR-F6 aircraft model – RANS simulation

  9. DLR-F6 aircraft model – RANS simulation

  10. DLR-F6 aircraft model – RANS simulation

  11. DLR-F6 aircraft model – RANS simulation

  12. DLR-F6 aircraft model – RANS simulation

  13. DLR-F6 aircraft model – RANS simulation

  14. F1 in platoon formation – RANS simulation

  15. F1 in platoon formation – RANS simulation

  16. F1 in platoon formation – RANS simulation

  17. F1 in platoon formation – RANS simulation

  18. F1 in platoon formation – RANS simulation

  19. F1 in platoon formation – RANS simulation

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