Deniau Hugues

Deniau Hugues
The French Aerospace Lab ONERA | ONERA · DMAE - Department of Aerodynamics and Energetics Modeling

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38
Publications
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566
Citations

Publications

Publications (38)
Article
Full-text available
In this paper, the Spectral Difference approach using Raviart-Thomas elements (SDRT) is formulated for the first time on tetrahedral grids. To determine stable formulations, a Fourier analysis is conducted for different SDRT implementations, i.e. different interior flux points locations. This stability analysis demonstrates that using interior flux...
Article
A flux reconstruction technique is presented in order to perform aeroacoustic computations using implicit high‐order spatial schemes on multiblock structured grids with non‐conforming interfaces. The use of such grids, with mesh spacing discontinuities across the block interfaces, eases local mesh refinements, simplifies the mesh generation process...
Conference Paper
The Spectral Difference method was introduced in 1996 by Kopriva and Kolias [6] as the staggered-grid Chebyshev multidomain method and applied to structured quadrilateral grids using a tensor product framework by Kopriva [5]. The scheme stability was demonstrated by Jameson [4] for tensor product cells but foundations of a stable formulation on sim...
Article
This article will introduce a new bypass-transition model based on the Klebanoff-mode dynamics. The model is built on the Laminar Kinetic Energy (LKE) concept, in order to be used in a Reynolds-Averaged Navier–Stokes (RANS) formulation. A new formulation of the LKE will be presented—it is based on a transport equation which quantifies the Klebanoff...
Chapter
Full-text available
This paper presents a comprehensive study of an impinging jet configuration (Grenson et al, Int J Heat Mass Trans 102:801–815, 2016), which has been selected for its high Reynolds number ReD = 60,000, small nozzle-to-plate distance H/D = 3 and temperature difference between the heated jet and the ambient. First, the experiments are described and an...
Article
This paper reports on the investigation of an original impinging jet configuration through a wall-resolved large-eddy simulation. The heated jet issues from a fully developed pipe flow at temperature of 130 °C and a Reynolds number based on the bulk velocity of 60000. The impinged plate is located three diameters downstream of the pipe exit. The CF...
Article
This paper presents a transition prediction model that adds additional equations to the Reynolds-averaged Navier–Stokes set. It is based on the so-called N-factor method, which is valid for natural transition on wings due to the hypothesis that it relies on (modal instabilities disturbing the boundary layer). It consists of an integration of the di...
Article
Compressible large-eddy simulations combining high-order methods with a wall model have been developed in order to compute wall-bounded flows at high Reynolds numbers. The high-order methods consist of low-dissipation and low-dispersion implicit finite volume schemes for spatial discretization on structured grids. In the first part, the procedure u...
Conference Paper
Full-text available
This paper reports on the results of a wall-resolved large-eddy simulation of an original impinging jet configuration: the Reynolds number based on the bulk velocity is 60000; the impinging plate is located three diameters downstream of the pipe exit; the jet issues from a fully developed pipe flow at temperature of 130 • C. Validation is carried o...
Article
For the last 10 years, large-eddy simulations have become a major tool for investigating jet noise sources because of their intrinsic ability to capture broadband turbulent features. However, many challenges still arise when dealing with complex geometries in terms of method accuracy and computational costs. Two different approaches to compute jet...
Article
Full-text available
Hot jets-in-cross-flow are frequently encountered in aeronautics and the accurate estimation of the wall temperature in the jet wake is crucial during the early design of a new aircraft. However, common two-equation RANS models fail at estimating the wall temperature in the jet wake. The use of Large-Eddy Simulation, which seems to be a promising s...
Article
Full-text available
6th European Conference on Computational Fluid Dynamics (ECFD VI) July 20 - 25, 2014, Barcelona, Spain Overview of transition prediction tools in elsA software Long term involvement of ONERA in laminar-turbulent transition modelling, and into the development of the elsA software, with major contributions from D. Arnal, R. Houdeville et al. have l...
Article
An axisymmetric truncated optimized contoured nozzle flow operating in overexpanded conditions is simulated in restricted shock separation regime. The numerical strategy adopted aims at computing essentially the largest dynamically active scales of the flow in order to analyze the unsteady mechanisms leading to the low-frequency peak of side loads...
Article
Aeroacoustics simulations require much more precise boundary conditions than classical aerodynamics. Two classes of non-reflecting boundary conditions for aeroacoustics are compared in the present work: the characteristic analysis-based methods and the Tam and Dong approach. In the characteristic methods, waves are identified and manipulated at the...
Article
A modification of a low speed preconditioning formulation is proposed to perform robust computations for both internal and external flows. This formulation is based on the isentropic Mach number to derive an efficient scheme for viscous flows. The preconditioning technique is coupled with a point-implicit symmetric Gauss-Seidel relaxation scheme in...
Conference Paper
Full-text available
Turbulence-interaction noise due to homogeneous isotropic turbulence impacting on a thick cambered NACA651210 airfoil with a significant spanwise extent (40%) has been sim- ulated for the first time at high Reynolds number (Rec=6.5 × 105) by a compressible Large Eddy Simulation (LES) accounting for the installation effects. The full wind-tunnel has...
Article
Efficient numerical tools taking advantage of the ever increasing power of high-performance computers, become key elements in the fields of energy supply and transportation, not only from a purely scientific point of view, but also at the design stage in industry. Indeed, flow phenomena that occur in or around the industrial applications such as ga...
Conference Paper
Full-text available
Passive treatments aiming at reducing turbofan broadband noise have been recently studied in the framework of European Project FLOCON. A concept based on a sinusoidal variation of the leading edge of a single airfoil expected to decrease interaction noise has been investigated by ONERA. Turbulence-airfoil interaction mechanism is achieved using a t...
Article
During the last years, the need of high fidelity simulations on complex geometries for aeroacoustics predictions has grown. Most of high fidelity numerical schemes, in terms of low dissipative and low dispersive effects, lie on finite-difference (FD) approach. But for industrial applications, FD schemes are less robust compared to finite-volume (FV...
Article
Full-text available
Realizing high-fidelity simulations is a key issue in Computational Fluid Dy-namics (CFD) for Aeroacoustics (CAA) studies. Indeed, in this case, CFD computations are required both to satisfy the stringent constraints of CAA and to allow a deep insight in the mechanisms responsible for the noise generation. For these purposes, high-order compact sch...
Conference Paper
Full-text available
This study aims to realize a Large-Eddy Simulation (LES) of a low-Mach, high Reynolds number jet. The nozzle geometry is included. The lips and the mixing layer are meshed in order to get the right potential core and turbulence levels. It is a first step towards the simulation of a configuration of jet noise control using micro-jets realized by Lau...
Article
The present numerical study is motivated by the challenge to simulate the three-dimensional spatial dynamics of a co-rotating vortex system, through the development of an elliptic instability (C. R. Phys. 2005; 6(4–5):431–450) using a high-order solver of the compressible Navier–Stokes equations. This phenomenon was studied previously only by tempo...
Conference Paper
The present numerical study is motivated by the challenge to simulate the three-dimensional spatial dynamics of a co-rotating vortex pair (1), through the development of an elliptic instability (2), using a high order solver of the compressible Navier-Stokes equations. This phenomenon was studing pre- viously only by temporal simulations. The inter...
Article
Full-text available
The principal objective of this paper is to study some unsteady characteristics of an interaction between an incident oblique shock wave impinging a laminar boundary layer developing on a plate plane. More precisely, this paper shows that some unsteadiness, in particular the low frequency unsteadiness, originate in a supercritical Hopf bifurcation...
Article
Turbulent flow separation in over-expanded rocket nozzles is investigated experimentally in a sub-scale model nozzle fed with cold air and having a thrust-optimized contour. Depending upon the pressure ratio either a free shock separation (FSS) or a restricted shock separation (RSS) is observed with a significant hysteresis between these two flow r...
Article
Three-dimensional supersonic viscous Bow computations including crossflow separation are presented for an ogive-cylinder at an angle of attack varying from 0 to 20 deg. Solutions are obtained for the parabolized Navier-Stokes equations from an algorithm that incorporates a fully upwind implicit approach. Results are presented for laminar flow assum...