Extending the buffet envelope: step change in data quantity and quality of analysis
Lead Research Organisation:
University of Southampton
Department Name: Faculty of Engineering & the Environment
Abstract
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Publications
Zauner M
(2019)
Modal Analysis of a Laminar-Flow Airfoil under Buffet Conditions at Re = 500,000
in Flow, Turbulence and Combustion
Zauner M
(2020)
Wide domain simulations of flow over an unswept laminar wing section undergoing transonic buffet
in Physical Review Fluids
Description | Simulations have been run, solving all relevant scales of motion of transonic buffet, considering two different angles of attack. Associated with this project we were successful in being awarded a PRACE project for additional supercomputer resources (at European Tier-0 level not available in UK). A report on this work for a non-technical audience can be found at https://www.gauss-centre.eu/results/computational-and-scientific-engineering/article/shock-related-buffeting-in-aeroplanes/ A improved understanding of the influence of the transitional state of the boundary layer on buffet has now been achieved, with results reported in a series of journal publications that have explored the different modes of unsteady behaviour and the influence of computational parameters. In 2021 a comprehensive parameter study was completed, showing the influence of angles of attach, Mach number and sweep on key flow features as well as a flow reconstruction based on spectral proper orthogonal decomposition (SPOD) that has been published. A particularly important finding has been that a phenomenon previous identified as laminar-buffet has been shown to be actually associated with a wake mode that can coexist with a lower-frequency true buffet mode. The latter has been shown to have the same physical mechanism as turbulent buffet, which clarifies the role of the boundary layer (laminar or turbulent) and paves the way for applications to laminar-flow (low drag) wings in the future. A full study has been made of transitional versus tripped cases, with accompanying Reynodls-Averaged Navier-Stokes (RANS) calculation provided by our partners at the University of Liverpool. An important result has been that global stability analysis, resolvent model analysis and spectral proper orthogonal decomposition based on large-eddy simulation, all provide similar mode shapes for the buffet mode on aerofoils. In particular this validates cheaper prediction methods based on global stability and precursor predictions based on resolvent analysis. |
Exploitation Route | Data from the simulations will allow further testing of simpler reduced order models and examination of intermediate-frequency modes. |
Sectors | Aerospace, Defence and Marine |
URL | https://www.gauss-centre.eu/results/computational-and-scientific-engineering/article/shock-related-buffeting-in-aeroplanes/ |
Description | Videos arising from the simulations have been widely viewed, including a non-technical audience https://www.youtube.com/channel/UCOto08s_01VXuiV4vWEctNQ |
First Year Of Impact | 2019 |
Sector | Aerospace, Defence and Marine |
Impact Types | Economic |
Title | OpenSBLI |
Description | Open source code released in 2021 |
Type Of Material | Improvements to research infrastructure |
Year Produced | 2021 |
Provided To Others? | Yes |
Impact | Benchmark code for ARCHER2 procurement |
URL | https://github.com/opensbli |
Title | Data supporting the article, "Transonic buffet characteristics under conditions of free and forced transition" published in the AIAA Journal, 2022 |
Description | This dataset supports the publication by Moise, P., Zauner, M., Sandham, N. D., Timme, S. & Wei, H "Transonic Buffet Characteristics Under Conditions of Free and Forced Transition", AIAA Journal, https://doi.org/10.2514/1.J062362. The data contains DataSets.zip, containing ".csv" (comma separated values, CSV) files in ASCII format. These CSV files correspond to several plots presented in the article, "Transonic Buffet Characteristics Under Conditions of Free and Forced Transition" published in the AIAA Journal, 2022. Plots with aerofoil geometry are not provided due to copyright reasons. All CSV files are named in a "fig[No][subfigure][description].csv" format (e.g. fig30d_X.csv refers to figure 30d in the article with X being the variable stored). The figures for which data is provided are: 3,6,7,8,11,12,13,18,A1,B1. A sample MATLAB script, sample Code.m is provided for plotting the data in the .csv files. Padeep Moise is an Assistant Professor, Department of Aerospace Engineering, Indian Institute of Technology Kanpur, Uttar Pradesh 208016, India (email pmoise@iitk.ac.in) |
Type Of Material | Database/Collection of data |
Year Produced | 2022 |
Provided To Others? | Yes |
URL | http://eprints.soton.ac.uk/id/eprint/471665 |
Description | Collaboration with JAXA on test cases |
Organisation | Japanese Aerospace Exploration Agency |
Country | Japan |
Sector | Public |
PI Contribution | We are conducting a code validation exercise for the Southampton and Jaxa codes for buffet test cases. Southampton are providing results using the in-house SBLI code. |
Collaborator Contribution | Jaxa are running their codes for these test cases. |
Impact | No outputs yet |
Start Year | 2022 |