UFR 3-30 Evaluation

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2D Periodic Hill

Underlying Flow Regime 3-30


Comparison of CFD Calculations with Experiments

The 2D PIV results were checked with 1D LDA measurements. A satisfactory compliance was found as can be seen in the following figures (Re=10,600).

Mean streamwise velocity component Mean streamwise Reynolds stresses <u'u'>

Comparison between experimental and numerical results at Re=10,600.

The experimental data at Reynolds number 10,600 are compared with LES results by LESOCC [Breuer et al. (2009)]. The following figures show averaged velocity profiles for <u>/ub at four streamwise positions.

Mean streamwise velocity component Mean streamwise velocity component <v>

The agreement between predicted and measured mean streamwise velocity component in the x-direction is very good. Minor deviations can be found in the shear layer (slightly higher velocities in the experiment) and in the post-reattachment. The vertical velocity component <v>/ub is about one order of magnitude smaller than the streamwise component and yet more sensitive. However, the measurements comply with the simulation results in a fully satisfactory manner. The largest deviations are found at x/h=2.

The measured and the predicted Reynolds shear stress show a close agreement at the different x/h-positions. The location of the experimental peak values and their distributions are in close accordance with the predictions. Solely at x/h=6 a slightly higher stress was found in the experimental data.

Mean streamwise Reynolds stresses <u'v'>

However, the agreement between the PIV measurement and the LES prediction is highly satisfactory.


Front Page

Description

Test Case Studies

Evaluation

Best Practice Advice

References


Contributed by: Christoph Rapp — Technische Universitat Munchen

© copyright ERCOFTAC 2009