Application of High-Order Large Eddy Simulation Turbomachinary

Lead Research Organisation: University of Cambridge
Department Name: Engineering

Abstract

I am interested in the use of high order Large Eddy Simulation (LES) and its plication to turbomachinery. LES aims to model 80-90% of the turbulence on grid and, if it is correctly applied, it has can prove to be more informative that other industrially used schemes. The turbomachinery applications best suited to LES are jets and ribbed passages; 2 Reynolds number independent flows. Experimental testing these regimes is very expensive and if high order methods can be successfully applied the cost of testing could be greatly reduced. The main benefit of high order methods is that they are faster compared to industrially used codes for like-for-like error. This is due to their ability to use coarser meshes. The modelling of jets is particularly important as it will impact the predicted noise levels of the aircraft. This is something that is becoming more pertinent in Britain, especially with the proposed 3rd runway for Heathrow.
A further application suited to the use of LES is the modelling of low pressure turbine (LPT) blades. This requires the scheme to more accurately handle the viscous fluxes. There are several approaches that have been proposed and implemented to do this. However, the effect of these schemes on subsequent turbulent filtering, and the further effect of the positioning of high order points on filtering, has yet to be researched. This optimisation of the solution point quadrature will also feed back into accuracy of the high order Euler scheme, which may go onto benefit the work proposed in the first paragraph.
To make the schemes attractive to industry, I would also propose researching the efficient porting of this scheme for heterogeneous computing. This is becoming increasingly important with programs being pushed towards use on more complex supercomputer architectures that utilise both CPUs and GPUs. Also, from my experience, high order schemes require this kind of hybrid approach for best speed up.

Publications

10 25 50

Studentship Projects

Project Reference Relationship Related To Start End Student Name
EP/N509620/1 01/10/2016 30/09/2022
1750012 Studentship EP/N509620/1 01/10/2016 31/03/2020 William Trojack
 
Description The research aimed to explore, and extend the understanding of, an emerging method of simulating physical system. We discovered some important considerations for software developers who wish to write such simulation tools. We also furthered the theoretical tools that could be used to understand how such methods would behave when applied practically to problems. This will aid practitioners who wish to apply these emerging methods in an industrial setting. The most recent findings of the project have been through greatly expanding the definition of one such method. In time this should allow for more accurate and faster simulations to be undertaken.
Exploitation Route The research itself has raised several questions, the answers of which could provide solutions to current problems in this field. these problems are particularly pertinent as these types of methods become more widely adopted by industry. For example, there are several problems in using these methods for simulating supersonics flows or for simulating air and water as in ship simulations.
Sectors Aerospace, Defence and Marine

URL https://arxiv.org/a/trojak_w_1.html
 
Description Nvidia GPU Seeding Grant
Amount £1,200 (GBP)
Organisation NVIDIA 
Sector Private
Country Global
Start 12/2017 
End 12/2018
 
Description Nvidia GPU Seeding Grant
Amount £3,000 (GBP)
Organisation NVIDIA 
Sector Private
Country Global
Start 02/2018 
End 02/2018
 
Description A New Family of Weighted One-Parameter Flux Reconstruction Schemes 
Organisation Imperial College London
Department Department of Aeronautics
Country United Kingdom 
Sector Academic/University 
PI Contribution I contributed to developing the mathematical basis of the theorised methods and writing up a large portion of the theory and test results.
Collaborator Contribution The partner undertook discussions with me and together we developed some ideas for how to extend the high-order Flux Reconstruction method. the partner also contributed to the writing of a paper of these ideas.
Impact The current outcome of this partnership is a research paper, co-authored by the partner and myself, that is under review at the International journal 'Computer Methods in Applied Mechanics and Engineering'
Start Year 2018
 
Description All Equalities Are Equal, but Some Are More Equal Than Others 
Organisation Alan Turing Institute
Country United Kingdom 
Sector Academic/University 
PI Contribution I developed the mathematical basis for ideas we had as a partnership, also, performing many of the computational experiments in testing the ideas.
Collaborator Contribution The partners helped in developing the ideas of the research. They also aided in testing the ideas in an industrial setting that formed an important part of the research output. They also contributed to the writing up of the results.
Impact the research to date of this collaboration has been written up in a research paper that is currently under review for the international journal 'Journal of Scientific Computing'. We are also in the planning stages of hosting a multidisciplinary short conference/symposium.
Start Year 2018
 
Description All Equalities Are Equal, but Some Are More Equal Than Others 
Organisation Queen's University Belfast
Country United Kingdom 
Sector Academic/University 
PI Contribution I developed the mathematical basis for ideas we had as a partnership, also, performing many of the computational experiments in testing the ideas.
Collaborator Contribution The partners helped in developing the ideas of the research. They also aided in testing the ideas in an industrial setting that formed an important part of the research output. They also contributed to the writing up of the results.
Impact the research to date of this collaboration has been written up in a research paper that is currently under review for the international journal 'Journal of Scientific Computing'. We are also in the planning stages of hosting a multidisciplinary short conference/symposium.
Start Year 2018