References of "Iaccarino, Gianluca"
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See detailStatistical inverse analysis and stochastic modelling of transition
Serino, Gennaro ULg; Marxen, Olaf; Pinna, Fabio et al

in CTR - Proceedings of the 2012 Summer Programm (2012, September)

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See detailReynolds-Averaged Navier-Stokes Simulations of the HyShot II Scramjet
Pecnik, Rene; Terrapon, Vincent ULg; Ham, Frank et al

in AIAA Journal (2012), 50(8), 1717-1732

The internal flow in the HyShot II scramjet is investigated through numerical simulations. A computational infrastructure to solve the compressible Reynolds-Averaged Navier-Stokes equations on ... [more ▼]

The internal flow in the HyShot II scramjet is investigated through numerical simulations. A computational infrastructure to solve the compressible Reynolds-Averaged Navier-Stokes equations on unstructured meshes is introduced. A combustion model based on tabulated chemistry is considered to incorporate a detailed chemical kinetics mechanics while retaining a low computational cost. Both non-reactive and reactive simulations have been performed and results are compared with ground test measurements obtained at DLR. Different turbulence models were tested and the dependence on the mesh is assessed through grid refinement. The comparison with experimental data shows good agreement, although for the reactive case the computed heat fluxes at the wall are higher than measurements. A sensitivity analysis on the turbulent Schmidt and Prandtl numbers shows that the choice of these parameters has a strong influence on the results. In particular, variations of the turbulent Prandtl number lead to large changes in the heat flux at the walls. Finally, the inception of thermal choking is investigated by increasing the equivalence ratio, whereby a normal shock is created locally and moves upstream leading to a large increase in the maximum pressure. Nevertheless a large portion of the flow is still supersonic. [less ▲]

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See detailIntroduction to uncertainty analysis and uncertainty representations
Terrapon, Vincent ULg; Iaccarino, Gianluca

Scientific conference (2011, May 13)

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See detailCharacterizing the operability limits of the HyShot II scramjet through RANS simulations
Emory, Michael; Terrapon, Vincent ULg; Pecnik, René et al

in 17th AIAA International Space Planes and Hypersonic Systems and Technologies Conference 2011, Vol. 2; No AIAA 2011-2282 (2011, April)

Experimental and flight data for hypersonic air-breathing vehicles are both difficult and extremely expensive to obtain, motivating the use of computational tools to enhance our understanding of the ... [more ▼]

Experimental and flight data for hypersonic air-breathing vehicles are both difficult and extremely expensive to obtain, motivating the use of computational tools to enhance our understanding of the complex physics involved. One of the major difficulties in simulating this regime is the interaction between combustion and turbulence, both of which are intrinsically complex processes. This work represents a first attempt at addressing assumptions introduced by physical models representing the turbulent reacting flow on the resulting predictions of the scramjet performance. A combustion model for high-speed flows is introduced and tested for the HyShot II vehicle. A reduced order chemistry model is then derived to investigate the effect of certain chemistry modeling assumptions within the combustion model. These models are used to investigate the unstart of the engine due to thermal choking by increasing the fuel flow rate. It is shown that an abrupt change occurs where a normal shock forms and moves upstream accompanied by a large region of subsonic flow. Additionally scalar metrics are described which are used as early indicators of unstart, to formulate safe operating limits for the scramjet engine. [less ▲]

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See detailNumerical predictions of the performance in flight of an air-breathing hypersonic vehicle: HyShot II
Iaccarino, Gianluca; Pecnik, Rene; Terrapon, Vincent ULg et al

in Proceedings of the ASME 2010 International Mechanical Engineering Congress & Exposition; No IMECE2010-40186 (2010, November)

The uncertainties inherent to the operating conditions of the Hyshot II scramjet flight test are assessed. In particular, the variability of the pressure prediction in the combustor due to uncertain free ... [more ▼]

The uncertainties inherent to the operating conditions of the Hyshot II scramjet flight test are assessed. In particular, the variability of the pressure prediction in the combustor due to uncertain free stream conditions is investigated using a probabilistic methodology based on stochastic collocation. The uncertainties in Mach number, angle of attack and flight altitude are inferred from pressure measurements in the unfueled combustor using a Bayesian inversion approach. The forward computation relies on a reduced order model that represents the combustion processes in the scramjet combustor. A ground based experimental data set obtained from 1-to-1 model of the HyShot II vehicle with well defined operating conditions is used to validate the non-reacting solver and to calibrate the heat release model for the reacting combustor. The model prediction agrees well with the experimentally acquired flight data. On the other hand, our estimated flight free stream conditions differ from previously published results. [less ▲]

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See detailFull-system RANS of the HyShot II scramjet Part 1: Numerics and non-reactive simulations
Pecnik, Rene; Terrapon, Vincent ULg; Ham, Frank et al

in Annual Research Briefs (2010)

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See detailFull system scramjet simulation
Pecnik, Rene; Terrapon, Vincent ULg; Ham, Frank et al

in Annual Research Briefs (2009)

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