UFR 3-30 Evaluation: Difference between revisions
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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). | 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). | ||
[[Image:Lda_piv_u4.jpg| | [[Image:Lda_piv_u4.jpg|300px|Mean streamwise velocity component <u>]] [[Image:Lda_piv_uu4.jpg|300px|Mean streamwise Reynolds stresses <u'u'>]] | ||
[[Image:Lda_piv_uu4.jpg| | |||
Comparison between experimental and numerical results at Re=10,600. | Comparison between experimental and numerical results at Re=10,600. | ||
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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>/u<sub>b</sub> at four streamwise positions. | 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>/u<sub>b</sub> at four streamwise positions. | ||
[[Image:10600_u.jpg| | [[Image:10600_u.jpg|300px|Mean streamwise velocity component <u>]] [[Image:10600_v.jpg|300px|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>/u<sub>b</sub> 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 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>/u<sub>b</sub> 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. | 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. | ||
[[Image:10600_uv.jpg| | [[Image:10600_uv.jpg|300px|Mean streamwise Reynolds stresses <u'v'>]] | ||
However, the agreement between the PIV measurement and the LES prediction is highly satisfactory. | However, the agreement between the PIV measurement and the LES prediction is highly satisfactory. | ||
Revision as of 14:52, 25 November 2009
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).
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.
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.
However, the agreement between the PIV measurement and the LES prediction is highly satisfactory.
Contributed by: Christoph Rapp — Technische Universitat Munchen
© copyright ERCOFTAC 2009