Dr. Arianna Bosco

Dr. Arianna Bosco

Advisor / Co. Advisor

Dr. Reinartz / Prof. Müller

Dissertation

Reynolds Stress Model for Hypersonic Flow

Contact

Arianna Bosco, M.Sc.
Aachen Institute for Advanced Study 
in Computational Engineering Science (AICES)
RWTH Aachen
Schinkelstraße 2
52056 Aachen

Tel. (0241) 80 99138
Fax (0241) 80 628498
Email bosco@aices.rwth-aachen.de

Education

since 12/2007 Postgraduate Position at Aachen Institute for Advanced Study in Computational Engineering Science (AICES), RWTH Aachen
10/2005 - 07/2007 Master of Science in Mathematical Modelling in Engineering, Politecnico di Torino, Italy
09/2004 - 03/2005 Erasmus student TUM (Munich), Germany
09/2002 - 10/2005 Bachelor of Science in Mathematical Modelling in Engineering, Universita`di Tor Vergata Roma, Italy

Professional Career

03/2007 - 05/2007 Internship at 'Optiflow' a consulting society in computational fluid dynamcis and heat transfer analysis in Marseille (France)
Topic: Numerical Simulation of Flow around a Rectangular Cylinder with RANS and LES Turbulence Models
09/2004 - 03/2005 Erasmus student TUM (Munich), Germany
04/2005 - 09/2005 Internship at 'INFN-LNF' the Italian National Institute for Nuclear Physics in Frascati, Italy
Topic: Numerical Simulation of the thermo-optical properties of the LARES and LAGEOS Satellites

Research Interests

Turbulent flow simulations for hypersonic intakes

The aerodynamic design of hypersonic inlets is a critical issue for the overall performance of an air breathing propulsion system. The primary purpose of the inlet is to provide homogeneous high–pressure flow to the engine with a minimum of aerodynamic losses. Compression is performed through a series of oblique shock waves and internal contraction that lead to a shock wave/expansion wave interaction pattern inside the inlet. Two phenomena characterize the technological problems of the inlet: on the one hand, the interaction of strong shock waves with thick hypersonic boundary layers causes large separation zones that reduce the captured mass flow and thus the engine performance. On the other hand, the high total enthalpy of the flow leads to severe aerodynamic heating, further enhanced by turbulent heat fluxes.

For what concerns the simulation of wall dominated flows with thick boundary–layers, strong shock / boundary–layer interaction and with separation, as they are of interest here, the assumption of a linear dependence between the Reynolds stress tensor and the strain rate tensor, as in eddy viscosity models, is not always valid. Therefore, differential Reynolds stress models (RSM) are important. Those models solve transport equations for each component of the Reynolds stress tensor as well as for an additional length scale. Thus, they are computationally expensive. Furthermore, they decrease the stability of the numerical scheme.

Nevertheless the combination of an adaptive code and a RSM for turbulence are now under investigation since they are expected to give good results in the study of the flows of interest here. In the future the performance of the RSM might be enhanced when connected to a transition model and taking into account high temperature gas dynamics.

Publications

'Probing Gravity in Neo with High-Accuracy Laser-Ranged Test Masses’ A.Bosco et al. International Journal of Modern Physics D Vol. 16, No. 11(2007)1–15
‘Simulation of the Thermo-Optical Properties of the LARES and LAGEOS Satellites for a Precise Measurement of the Lense-Thierring Effect in General Relativity’ B.Sc thesis, Universita’ di Tor Vergata Roma, Italy
‘3D flow around a rectangular cylinder: a computational study’ A.Bosco, L.Bruno, N.Coste submitted to BBAA VI Interntional Colloquium on: Bluff Bodies Aerodynamics & Applications
‘Applicazioni Tecnologiche della Camera Spaziale Climatica dei Laboratori Nazionali di Frascati’ G.Bellettini et al. presented at “InnovAction”, 2006