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
Abstracts are not currently available in GtR for all funded research. This is normally because the abstract was not required at the time of proposal submission, but may be because it included sensitive information such as personal details.
Publications
Houtman J
(2023)
Resolvent analysis of a finite wing in transonic flow
in Flow
Jacobs C
(2018)
An error indicator for finite difference methods using spectral techniques with application to aerofoil simulation
in Computers & Fluids
Moise P
(2024)
Connecting transonic buffet with incompressible low-frequency oscillations on aerofoils
in Journal of Fluid Mechanics
Moise P
(2023)
Transonic Buffet Characteristics Under Conditions of Free and Forced Transition
in AIAA Journal
Moise P
(2022)
Large-eddy simulations and modal reconstruction of laminar transonic buffet
in Journal of Fluid Mechanics
Moise P.
(2022)
EFFECT OF BOUNDARY-LAYER TRIPPING ON TRANSONIC BUFFET FOR A LAMINAR-FLOW WING SECTION
in 12th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2022
Zauner M
(2019)
Modal Analysis of a Laminar-Flow Airfoil under Buffet Conditions at Re = 500,000
in Flow, Turbulence and Combustion
Zauner M
(2019)
Direct Numerical Simulations of Transonic Flow Around an Airfoil at Moderate Reynolds Numbers
in AIAA Journal
Zauner M
(2020)
Direct and Large Eddy Simulation XII
Zauner M
(2020)
Wide domain simulations of flow over an unswept laminar wing section undergoing transonic buffet
in Physical Review Fluids
Description | This project tackled the problem of airfoil and wing buffet - an unsteady phenomenon that limits the flight envelope of commercial aircraft. Better prediction of the flight envelope would enable more efficient wind design and pave the way for the application of flow control methods to extend the envelope, again with implications for fuel saving. The methodology of the project was wall-resolved large eddy simulation, a technique for solving the energy containing scales of turbulence. During the project an improved methodology was developed based on spectral estimation of errors, enabling more effective grid generation to resolve key features in the flow. 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/ An 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 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 Reynolds-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. The research has continued beyond the end date of the original project. Recent work has proposed a connection between transonic buffet and unsteady stall without shock waves, which had important conceptual implications for modelling. Geometry effects (via a collaboration with JAXA) are being explored by a collaboration with JAXA. |
Exploitation Route | The insight gained is useful in the context of next-generation wings exploiting laminar flow technology. The improved simulation techniques can be used in large-eddy simulation of high-speed flows. The data from the simulation is useful for assessing the performance of engineering models. |
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 |