UFR 2-12 Evaluation: Difference between revisions
| Line 20: | Line 20: | ||
==== Effect of span size of domain ==== | ==== Effect of span size of domain ==== | ||
As mentioned in Section 4, the aspect ratio of the CT configuration ''L<sub>z</sub>/ D'' in the BART facility is equal to 12.4. | As mentioned in Section 4, the aspect ratio of the CT configuration ''L<sub>z</sub>/ D'' in the BART facility is equal to 12.4. | ||
Strictly speaking this demands carrying out simulations exactly at this value of | Strictly speaking this demands carrying out simulations exactly at this value of ''L<sub>z</sub>/ D'' and imposing | ||
no-slip boundary conditions on the floor and ceiling of the test section (see Figure 2). | |||
However such simulations would be very expensive. | |||
Considering this and, also, recommendations of the BANC-I Workshop based on simulations at different ''L<sub>z</sub>/ D'' | |||
with periodic boundary conditions in the spanwise directions, most of the simulations in the ATAAC project were performed at | |||
''L<sub>z</sub>/ D'' = 3 assuming spanwise periodicity. | |||
In order to get an idea on how strong the effect of such a simplification could be, NTS conducted a series of | |||
simulations at different ''L<sub>z</sub>/ D''. | |||
Some results of these simulations are presented below [[UFR_2-12_References#3|[3]]]. | |||
<br/> | <br/> | ||
---- | ---- | ||
Revision as of 12:33, 27 October 2012
Turbulent Flow Past Two-Body Configurations
Flows Around Bodies
Underlying Flow Regime 2-12
Evaluation
Comparison of CFD Calculations with Experiments
This section is organized as follows. First (Section 6.1), results of some sensitivity studies are presented and briefly discussed. These include evaluation of such effects as span-size of the domain, compressibility, time sample used for computing the mean flow and turbulent statistics, and numerical dissipation of the method used. Then, in Section 6.2, a comparison with the experimental data is shown for the main body of simulations carried out within the ATAAC project with the use of the physical and computational problem setups outlined in Section 5.
RESULTS OF SENSITIVITY STUDIES
Effect of span size of domain
As mentioned in Section 4, the aspect ratio of the CT configuration Lz/ D in the BART facility is equal to 12.4.
Strictly speaking this demands carrying out simulations exactly at this value of Lz/ D and imposing
no-slip boundary conditions on the floor and ceiling of the test section (see Figure 2).
However such simulations would be very expensive.
Considering this and, also, recommendations of the BANC-I Workshop based on simulations at different Lz/ D
with periodic boundary conditions in the spanwise directions, most of the simulations in the ATAAC project were performed at
Lz/ D = 3 assuming spanwise periodicity.
In order to get an idea on how strong the effect of such a simplification could be, NTS conducted a series of
simulations at different Lz/ D.
Some results of these simulations are presented below [3].
Contributed by: A. Garbaruk, M. Shur and M. Strelets — New Technologies and Services LLC (NTS) and St.-Petersburg State Polytechnic University
© copyright ERCOFTAC 2024