UFR 3-30 Evaluation: Difference between revisions
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=='''Comparison of CFD Calculations with Experiments'''== | =='''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. | |||
[[File:lda_piv_u4.jpg|500px|Mean streamwise velocity component <u>]] | |||
[[File:lda_piv_uu4.jpg|500px|Mean streamwise Reynolds stresses <u'u'>]] | |||
Comparison between experimental and numerical results at Re=10,595. | |||
The experimental data at Reynolds number 10,595 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. | |||
[[File:10600_u.jpg|none|Mean streamwise velocity component <u>]] | |||
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. | |||
[[File:10600_v.jpg|500px|Mean streamwise velocity component <v>]] | |||
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. | |||
[[File:10600_uv.jpg|500px|Mean streamwise Reynolds stresses <u'v'>]] | |||
However, the agreement between the PIV measurement and the LES prediction is highly satisfactory. | |||
Revision as of 14:37, 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.
Comparison between experimental and numerical results at Re=10,595.
The experimental data at Reynolds number 10,595 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