Pierre Grenson

• MSc Aerospace Engineering
• PhD at Office National d'Études et de Recherches Aérospatiales

Ce travail porte sur l’étude expérimentale d’une configuration particulière de jet en impact. Un écoulement de conduite turbulente pleinement développé et chauffé débouche dans un environnement à température ambiante et impacte une paroi plane située trois diamètres en aval de la sortie. Le champ de vitesse est caractérisé à l’aide des techniques d...

A novel bleed model derived from a comprehensive dataset generated by a numerical parametric study is introduced. This model discretely represents the hole contour on a porous patch, allowing the mesh to incorporate the hole pattern. This approach enables the extraction of the tangential Mach number at the outflow boundary condition within the RANS...

This paper presents a comprehensive experimental and numerical investigation into the control of boundary layers using porous bleed systems. The study focuses on both supersonic and subsonic flow regimes, as well as on the control of shock-wave/boundary-layer interactions. By simplifying this complex problem into two separate scenarios, the researc...

This paper presents a comprehensive experimental and numerical investigation into the control of boundary layers using porous bleed systems. The study focuses on both supersonic and subsonic flow regimes, as well as on the control of shock-wave/boundary-layer interactions. By simplifying this complex problem into two separate scenarios, the researc...

Porous bleed systems are a common technique to control shock-/boundary-layer interactions and/or supersonic boundary layers. However, the influence of various design parameters is still unknown. Even though porous bleed models are required to minimize the costs of the design process, they often do not include parameter effects. In the present study...

Porous bleed systems are widely used to mitigate the shock-induced boundary layer separation, e.g., in supersonic air intakes. However, the complex geometry makes simulations expensive and motivates the application of suitable models. Existing models are based on applying a continuous blowing/suction boundary condition (continuous porosity) along t...

This paper aims to evaluate the prediction accuracy of various porous bleed models on two flow cases of particular interest for supersonic applications: turbulent boundary layer bleeding and control of shock-boundary layer interactions. A thorough literature review was conducted to select the most relevant models. The models were then implemented a...

Porous bleed systems are a common technique to control shock-boundary layer interactions and/or supersonic boundary layers. However, the influence of various design parameters is still unknown. Even though bleed models are required to minimize the costs of the design process, they often do not include parameter effects. In the present study, the ef...

This study presents simulations and experiments on the effect of porous bleed systems on a supersonic turbulent boundary layer at a Mach number of M=1.6. The results indicate a good fit between the RANS simulations and the experiments based on LDV, BOS, and pressure measurements. The numerical simulations well capture the overall flow topology. Bot...

In this paper, several existing porous bleed models are implemented intothe in-house RANS-solver elsA, and their performance are evaluated ontwo different flow cases. Reference simulations are performed to evalu-ate the accuracy of the applied bleed models and to show the lack ofmodeling different plate geometries. The models significantly differ i...

In this paper, several existing porous bleed models are implemented into the in-house RANS-solver elsA, and their performance are evaluated on two different flow cases. Reference simulations are performed to evaluate the accuracy of the applied bleed models and to show the lack of modeling different plate geometries. The models significantly differ...

Porous bleed systems are widely used to mitigate the shock-induced boundary layer separation, e.g., in supersonic air intakes. However , the complex geometry makes simulations expensive and motivates the application of suitable models. Existing models are based on applying a continuous blowing/suction boundary condition (continuous porosity) along...

Porous bleed systems are a common technique to control shock-boundary layer interactions and/or supersonic boundary layer. However, the influence of various design parameters is still unknown. Even though bleed models are required to minimize the costs of the design process, they often do not include parameter effects. In the present study, the eff...

Porous bleed systems are widely used to mitigate the shock-induced boundary layer separation, e.g., in supersonic air intakes. However, the complex geometry makes simulations expensive and motivates the application of suitable models. In this paper, seven porous bleed models are implemented as boundary conditions in the in-house compress-ible RANS...

View Video Presentation: https://doi.org/10.2514/6.2021-2568.vid The renewed interest for Supersonic Civil Transport on one side and the environmental challenges that whole aeronautics sector will have to overcome in the next decades calls for an holistic evaluation of the environmental impacts of a possible reintroduction of supersonic flights af...

Purpose This paper aims at reporting the attempts to predict “on-the-fly” the flow distortion in the engine entrance plane of a highly curved S-duct from wall static pressure measurements. Such a technology would be indispensable to trigger active flow control devices in order to mitigate the intense flow separations which occur in specific flight...

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...

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...

Cette thèse porte sur la caractérisation expérimentale et la simulation numérique d’une configurationde jet rond en impact peu rencontrée dans la littérature : un jet chauffé issu d’une conduitepleinement développée à un haut nombre de Reynolds (ReD = 60 000) impacte normalement uneparoi située à trois diamètres en aval. Le premier volet de ce trav...

The present work aims at investigating a particular impinging jet configuration throughout a comprehensive experimental approach. A preheated air jet at 130 °C issues a fully developed circular pipe at Reynolds number 60,000 and discharges in the laboratory room to impinge a flat plate located 3 diameters downstream. The description of the velocity...

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...

Caractérisation expérimentale dynamique et thermique d’un jet rond chauffé impactant une paroi plane

The present work aims at investigating a particular impinging jet configuration throughout a comprehensive experimental approach. A round air jet at 130 • C and Re D = 60,000, discharges in the laboratory room and impinges a flat plate located 3 diameters downstream. The velocity field is characterized by means of stereoscopic particle image veloci...

Recently, a new variant of the near-wall omega-h-Reynolds stress model has been proposed. This variant uses the specific homogeneous dissipation rate as turbulent length-scale. Such a variant is worth to be investigated because the !-based models are expected to better behave with respect to their numerical properties and they present the advantage...