UFR 3-33 Evaluation

Turbulent flow past a smooth and rigid wall-mounted hemisphere

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Evaluation

Unsteady results

Fig. 1: Visualization of flow regions and characteristic flow features of the flow past the hemisphere: (1) horseshoe vortex system, (2) stagnation area, (3) acceleration of the flow, (4) separation point, (5) dividing streamline, (6) shear layer vorticity, (7) reattachment point.

Fig. 2: Snapshot of unsteady vortical structures visualized by utilizing the iso-surfaces of the pressure fluctuations ($p'/(\rho _{\text{air}}U_{\infty }^{2})=-2.47\times 10^{-4}$) colored by the spanwise instantaneous velocity.

Fig. 3: Velocity spectra at the monitoring points $P_{1}$ and $P_{2}$ in the wake regime of the hemisphere.

Fig. 4: Vortex shedding from the top of the hemisphere visualized by the pressure fluctuations of the LES in the symmetry plane.

Fig. 5: Visualization of the two vortex shedding types present in the wake behind the hemisphere.

Comparison between numerical and experimental time-averaged results

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Contributed by: Jens Nikolas Wood, Guillaume De Nayer, Stephan Schmidt, Michael Breuer — Helmut-Schmidt Universität Hamburg

Front Page

Description

Test Case Studies

Evaluation

Best Practice Advice

References

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