Computation of Turbulent Flow in a Rotating Pipe Using Standard Eddy-Viscosity Models and an Elliptic Blending Reynolds Stress Model

Speaker: Neil Ashton, University of Oxford
July 5, 2016

Presentation

Abstract

The flow through a axially rotating pipe is examined using the open-source code OpenFOAM for both standard eddy-viscosity models (Spalart-Allmaras & k – ω SST) and a low-Reynolds number Elliptic Blending Reynolds Stress Model with a homogenous turbulent dissipation rate equation. The purpose being to develop a new test-case for the NASA Turbulence Modelling Resource website to validate/verify turbulence models for a rotating flow. Corrections to the length-scale determining equation for rotation, based upon the work of Hellsten et al. (1998), are evaluated for both the SST and EB-RSM models. A clear improvement to both the SST and EB-RSM models is observed when a Richardson correction is applied to the length-scale determining equations, resulting in much closer agreement to the experimental data. The results for the EB-RSM with this correction are in good agreement with previous studies and further improvements to the turbulent diffusion model would likely improve the correlation to the experiment even further. In addition to work on the rotating pipe case, a number of verification test cases were simulated to verify the implementation of the standard SA and SST models in OpenFOAM.

Biography

Neil Ashton completed his Masters and Ph.D. at the University of Manchester in 2012 where his thesis focused on the development of a new DDES model based upon elliptic relaxation. He has since been involved in a number of EU-funded turbulence modelling projects (such as the ATAAC & Go4hybrid projects) which looked at developing hybrid RANS-LES approaches suitable for the aerospace industry. He is now a researcher at the University of Oxford’s e-Research Centre, where his work is focused on developing improved RANS and hybrid RANS-LES methods for the automotive and aerospace industry. He is actively involved with the AIAA Turbulence Modelling Benchmark group and is currently a STC visiting scholar at NASA Ames within the Computational Aerosciences branch.

Seminar Participation

Attending In Person

For select seminars, you may wish to attend in-person if you are in the vicinity of NASA Ames Research Center. These AMS seminars are held in Building N258 in Room 127, just off the front lobby. Sessions available to attend in-person will be indicated in the announcement information. In-person participants without NASA badges will need a valid visitor badge (US citizenship or permanent residency is required) to enter the facility.

Join Us Online

To attend an AMS seminar, click on the Microsoft Teams link in the seminar description. You can connect through the desktop Teams App if you have it, or you can select "Watch on the Web Instead" to enter the meeting as a guest. Please ensure that you've muted your microphone in Teams before you select "Join Now" to enter the meeting lobby.