Neil D. Sandham
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View article: Role of nonlinearities induced by deterministic forcing in the low-frequency dynamics of transitional shock wave/boundary layer interaction
Role of nonlinearities induced by deterministic forcing in the low-frequency dynamics of transitional shock wave/boundary layer interaction Open
Direct numerical simulations are carried out to investigate the underlying mechanism of the low-frequency unsteadiness of a transitional shock reflection with separation at $M=1.5$ . To clarify the nonlinear mechanisms, the incoming lamina…
View article: Reduced and mixed precision turbulent flow simulations using explicit finite difference schemes
Reduced and mixed precision turbulent flow simulations using explicit finite difference schemes Open
The use of reduced and mixed precision computing has gained increasing attention in high-performance computing (HPC) as a means to improve computational efficiency, particularly on modern hardware architectures like GPUs. In this work, we …
View article: Open-Source Parametric Airfoils to Study Geometric Effects on Buffet
Open-Source Parametric Airfoils to Study Geometric Effects on Buffet Open
Recent research into buffet in the transonic flow regime has been focused on\na limited number of proprietary airfoil geometries and has mainly considered\nparametric variations in Mach number and angle of attack. In contrast,\nrelatively …
View article: Comparison of high-order numerical methodologies for the simulation of the supersonic Taylor–Green vortex flow
Comparison of high-order numerical methodologies for the simulation of the supersonic Taylor–Green vortex flow Open
This work presents a comparison of several high-order numerical methodologies for simulating shock/turbulence interactions based on the supersonic Taylor–Green vortex flow, considering a Reynolds number of 1600 and a Mach number of 1.25. T…
View article: Connecting transonic buffet with incompressible low-frequency oscillations on aerofoils
Connecting transonic buffet with incompressible low-frequency oscillations on aerofoils Open
Self-sustained, low-frequency, coherent flow unsteadiness over rigid, stationary aerofoils in the transonic regime is referred to as transonic buffet. This study examines the role of shock waves in sustaining this transonic phenomenon and …
View article: Numerical simulation of transpiration cooling for a high-speed boundary layer undergoing transition to turbulence
Numerical simulation of transpiration cooling for a high-speed boundary layer undergoing transition to turbulence Open
Cooling the surface of high-speed vehicles by injection of coolant into the flow stream aims to reduce the overall weight and cost of thermal protection systems. Here, the transpiration-based cooling method is studied for a Mach number M∞ …
View article: Direct Numerical Simulations of Shock Trains
Direct Numerical Simulations of Shock Trains Open
Accompanying data for PhD thesis, Gillespie, A. (2021). Direct Numerical Simulations of Shock Trains. University of Southampton. Three data files are submitted alongside this document containing data produced over the course of the project…
View article: On the Co-existence of Transonic Buffet and Separation-Bubble Modes for the OALT25 Laminar-Flow Wing Section
On the Co-existence of Transonic Buffet and Separation-Bubble Modes for the OALT25 Laminar-Flow Wing Section Open
Transonic buffet is an unsteady flow phenomenon that limits the safe flight envelope of modern aircraft. Scale-resolving simulations with span-periodic boundary conditions are capable of providing new insights into its flow physics. The pr…
View article: Connecting transonic buffet with incompressible low-frequency oscillations on aerofoils
Connecting transonic buffet with incompressible low-frequency oscillations on aerofoils Open
Self-sustained low-frequency flow unsteadiness over rigid aerofoils in the transonic regime is referred to as transonic buffet. Although the exact physical mechanisms underlying this phenomenon are unclear, it is generally assumed to be un…
View article: Numerical study of the effect of sidewalls on shock train behaviour
Numerical study of the effect of sidewalls on shock train behaviour Open
Strongly coupled sequences of shock waves, known as shock trains, are present in high-speed propulsion systems, where the presence of sidewalls substantially modifies the boundary layer thickness, skin friction and streamwise pressure dist…
View article: On the co-existence of transonic buffet and separation-bubble modes for the OALT25 laminar-flow wing section
On the co-existence of transonic buffet and separation-bubble modes for the OALT25 laminar-flow wing section Open
Transonic buffet is an unsteady flow phenomenon that limits the safe flight envelope of modern aircraft. Scale-resolving simulations with span-periodic boundary conditions are capable of providing new insights into its flow physics. The pr…
View article: Transonic buffet characteristics under conditions of free and forced transition
Transonic buffet characteristics under conditions of free and forced transition Open
Transonic buffet is commonly associated with self-sustained flow unsteadiness involving shock-wave/boundary-layer interaction over aerofoils and wings. The phenomenon has been classified as either laminar or turbulent based on the state of…
View article: Large-eddy simulations and modal reconstruction of laminar transonic buffet
Large-eddy simulations and modal reconstruction of laminar transonic buffet Open
Transonic buffet refers to the self-sustained periodic motion of shock waves observed in transonic flows over wings and can limit the flight envelope of aircraft. Based on the boundary layer characteristics at the shock foot, buffet has be…
View article: Direct numerical simulations of shocklet-containing turbulent channel counter-flows
Direct numerical simulations of shocklet-containing turbulent channel counter-flows Open
Counter-flow or counter-current configurations can maintain high turbulence intensities and exhibit a significant level of mixing. We have previously introduced a wall-bounded counter-flow turbulent channel configuration (Physical Review F…
View article: Roughness-Induced Instabilities and Transition on a Generic Hypersonic Forebody at Mach 6
Roughness-Induced Instabilities and Transition on a Generic Hypersonic Forebody at Mach 6 Open
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View article: DNS of a counter-flow channel configuration
DNS of a counter-flow channel configuration Open
Mean flow and turbulence statistics of a compressible turbulent counter-flow channel configuration. This dataset is based on direct numerical simulations conducted using OpenSBLI (https://opensbli.github.io/), a Python-based automatic sour…
View article: DNS of a counter-flow channel configuration
DNS of a counter-flow channel configuration Open
Mean flow and turbulence statistics of a compressible turbulent counter-flow channel configuration. This dataset is based on direct numerical simulations conducted using OpenSBLI (https://opensbli.github.io/), a Python-based automatic sour…
View article: Dataset for wide domain simulations of flow over an unswept laminar wing section undergoing transonic buffet
Dataset for wide domain simulations of flow over an unswept laminar wing section undergoing transonic buffet Open
This dataset corresponds to the publication: Wide domain simulations of flow over an unswept laminar wing section undergoing transonic buffet by M. Zauner & N.D. Sandham in Physical Review Fluids, 2020. This data-set contains the source co…
View article: On the performance of WENO/TENO schemes to resolve turbulence in DNS/LES of high‐speed compressible flows
On the performance of WENO/TENO schemes to resolve turbulence in DNS/LES of high‐speed compressible flows Open
Summary High‐speed compressible turbulent flows typically contain discontinuities and have been widely modeled using Weighted Essentially Non‐Oscillatory (WENO) schemes due to their high‐order accuracy and sharp shock capturing capability.…
View article: SBM flow statistics over a grit-blasted surface
SBM flow statistics over a grit-blasted surface Open
Data created and presented by F. Alves Portela and N. D. Sandham, "A DNS/URANS approach for simulating rough-wall turbulent flows". International Journal of Heat and Fluid Flow. 2020 (doi: 10.1016/j.ijheatfluidflow.2020.108627) as wel…
View article: Transition mechanisms in cross-flow-dominated hypersonic flows with free-stream acoustic noise
Transition mechanisms in cross-flow-dominated hypersonic flows with free-stream acoustic noise Open
This is an accepted manuscript of an article published by Cambridge University Press in Journal of Fluid Dynamics on 04/06/2020, available online: https://doi.org/10.1017/jfm.2020.346
\nThe accepted version of the publication may differ f…
View article: Shock-Wave/Boundary-Layer Interactions in Transitional Rectangular Duct Flows
Shock-Wave/Boundary-Layer Interactions in Transitional Rectangular Duct Flows Open
Shock-wave/boundary-layer interactions (SBLI) are an important feature of high-speed gas dynamics. In many numerical studies of SBLI span-periodicity is assumed to reduce computational complexity. However, span-periodicity is not a valid a…