[DES+Local Time Stepping] Steady-state simulation of Ahmed Body

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Spalart Allmaras with rotation/curvature Correction (SA-RC) is explained here.
Spalart Allmaras with another rotation/curvature Correction (SA-RCM) is explained here.

Steady-state simulation of Ahmed Body (slant angle is 30 degrees) using DES and Local Time Stepping Method was done.

・Force Coefficients


Force coefficients of SA-RC DDES model in the table above are the averaged value during 3001 time steps.

・Gradient Contours

Pressure of SA-RC DDES

Ux of SA-RC DDES

・Gradient Contours of Average Field (and the results of SA-RC RANS as references)

Average pressure of SA-RC DDES (3001 time steps)

Pressure of SA-RC RANS (reference)

Average Ux of SA-RC DDES (3001 time steps)

Ux of SA-RC RANS (reference)

Flow separation at the slant was reproduced in the calculation with SA-RC DDES.

Comments

  1. Anonymous28 April 2015 at 03:31

    That looks really promising, did you use the high Reynolds turbulence model. It would be interesting to see how your yPlus looks like, which numerical scheme you use to solve this flow.

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    Replies
    1. hobbyfoamer28 April 2015 at 14:42

      I have used the following turbulence models:

      1. realizableKE
      2. kOmegaSST <-not reported in this blog
      3. SpalartAllmaras
      4. SpalartAllmaras (SA-RCM)
      5. SpalartAllmaras (SA-RC)
      6. SpalartAllmarasDDES (SA-RC) <- reported in this article
      7. SpalartAllmaras (SA-RC compressible) <- to be reported in the next article

      yPlus is 20~40 on average and the numerical schemes are,

      grad: Gauss linear
      div: Gauss Gamma and Gauss GammaV
      laplacian: Gauss linear limited corrected 0.333
      snGrad: limited corrected 0.333

      Thank you.

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