Coordinatore del Gruppo
Luigi de Luca - Professore di fluidodinamica (ING-IND/06)
Settore ERC del Gruppo
PE8_1 Aerospace engineering
PE8_5 Fluid mechanics, hydraulic-, turbo-, and piston engines
Componenti del Gruppo
Gennaro Coppola - Ricercatore di fluidodinamica (ING-IND/06)
Fortunato De Rosa - Post-doc (DII)
Matteo Chiatto - PhD student (DII)
Michele Girfoglio - PhD student (DII)
Francesco Capuano - PhD student (DII) and researcher at CIRA, Italian Center for Aerospace Research (Capua)
Armandojanni Petrucci Orefice - PhD student (DII)
Annagrazia Orazzo - PhD student / Post-doc (DII)
Componenti esterni all'Ateneo
Onofrio Semeraro - Post-doc (Ecole Polytechnique, Ladyx, Paris Palaiseau)

ACTIVITY OUTLINES

The Stability and Numerical Simulation in Thermo-Fluid-Dynamics group is active in both theoretical and computational research fields of hydrodynamic stability and control as well as numerical simulation in thermo-fluid-dynamics.

The group has a consolidated background in theory and methods of hydrodynamic stability. The focus is mainly on linear stability analysis and the methods employed span from classical eigenvalues modal analysis to more modern non modal theories. The applications developed over the past years have been in the analysis of shear and capillary instabilities of two-phase flows, such as the stability of a gravitational liquid sheet subjected to surface tension and of Core-Annular Flow configurations inside a pipe. Recent research activity has focused on confined flows of non-newtonian fluids.

Another research interest is related to the analysis and the development of micro-devices devoted to flow control (and also to heat transfer cooling), the so called synthetic jets and plasma actuators. The group developed a lumped-element physical model to predict the frequency response of a synthetic jet actuator driven by a thin piezoelectric disk. The model was validated through experimental tests carried out on home-made devices having different mechanical and geometrical characteristics. More recently, the spark-jet plasma actuator device has been addressed, from both the theoretical modeling and the experimental viewpoints. Such flow control actuators can be used to modify (delay) the laminar-to-turbulent transition, to prevent or induce separation, and to enhance aerodynamic performances of airfoils (e.g., high lift).

The numerical simulation activity is conducted within two main research fields. The first one is relative to the applications of Volume of Fluid (VOF) techniques to complex two-fluid systems. Examples of recent applications are the study of the impact of drops on thin liquid films and the evolution of isolated nonlinear waves at the interface between two immiscible fluids. The second research topic, related to the numerical simulation activity, is relative to the construction of high order numerical schemes for turbulent simulations. The focus is mainly on the construction of Runge-Kutta time integration techniques with optimal energy conservation properties.

The cooperative activity with the foreign member is documented by the article on international journal: Interfacial instability of two rotating viscous immiscible fluids in a cylinder. G. Coppola and O. Semeraro. Physics of Fluids, Vol 23, 064105 (2011). http://dx.doi.org/10.1063/1.3599507

 

Collaborazioni

VISITING RESEARCH ACTIVITY

  • Annagrazia Orazzo, January/June 2011, Institut Jean Le Rond D'Alembert, Université Pierre et Marie Curie, Paris under the supervision of Prof. Jerome Hoepffner.
    Paper produced:
    The evolution of a localized nonlinear wave of the Kelvin-Helmholtz instability with gravity. A. Orazzo and J. Hoepffner. Physics of Fluids, Vol 24, issue 11, 112106 (2012).http://dx.doi.org/10.1063/1.4767512
  • Matteo Chiatto, October 2013/June 2014, Research Master at Von Karman Institute, Aeronautics and Aerospace Department, Rhode-St-Genèse, Belgium.
    Paper produced:
    Characterization of Synthetic Jet Resonant Cavities. L. de Luca, M. Girfoglio, M. Chiatto, G. Coppola, Flinovia - Flow Induced Noise and Vibration Issues and Aspects, E. Ciappi et al. eds., 101-118, Springer International Publishing Switzerland (2015). DOI 10.1007/978-3-319-09713-8_6
  • Gennaro Coppola and Francesco Capuano, July 2014, Center for Turbulence Research (CTR) Summer Program 2014, http://ctr.stanford.edu/SummerProgram/
    Paper produced:
    A low-cost time-advancing strategy for energy-preserving turbulent simulations, F. Capuano, G. Coppola, G. Balarac, H. J. Bae and L. de Luca. Center for Turbulence Research (CTR), Stanford University. Proceedings of the Summer Program 2014.
Progetti di Ricerca
  • Sviluppo di dispositivi a getto sintetico per diverse applicazioni tecnologiche (fluidodinamica e scambio termico). Polo delle Scienze e delle Tecnologie. Università degli Studi di Napoli Federico II, progetti F.A.R.O.. Progetto cofinanziato dalla Compagnia di S. Paolo (2011).
  • Fenomeni di instabilità Newtoniane e viscoelastiche in flussi confinati. Polo delle Scienze e delle Tecnologie. Università degli Studi di Napoli Federico II, progetti F.A.R.O. (2012).
  • Analisi delle fenomenologie fluidodinamiche presenti nella progettazione e sviluppo di mezzi di trasporto a basso impatto ambientale, nell'ambito di una sicurezza sostenibile. POR Campania, FSE 2007/2013, Asse IV e V, Reti di Eccellenza tra Università- Centri di Ricerca- Imprese, Tematica 4/subcomparto: Trasporti- Aeronautica- Spazio (2012-2014).
Pubblicazioni

Theory and methods of hydrodynamic stability

  • Interfacial instability of two rotating viscous immiscible fluids in a cylinder, G. Coppola and O. Semeraro, 2011, Physics of Fluids, Vol 23, 064105
  • Non-modal instability of core-annular flow, Coppola, G., Orazzo, A., de Luca, L., 2012, Journal of Nonlinear Sciences and Numerical Simulation, 13 (6), pp. 405-415
  • Surface tension effects on the motion of a free-falling liquid sheet, Coppola, G., De Rosa, F., de Luca, L., 2013, Physics of Fluids, 25 (6), 062103
  • Disturbance energy growth in core-annular flow, Orazzo, A., Coppola, G., de Luca, L., 2014, Journal of Fluid Mechanics, 747, pp. 44-72
  • Global dynamics analysis of nappe oscillation, De Rosa, F., Girfoglio, M., de Luca, L., 2014, Physics of Fluids, 26 (12), 1.4904752

Synthetic jets and plasma actuators

  • Modeling and experimental validation of the frequency response of synthetic jet actuators, de Luca, L., Girfoglio, M., Coppola, G., 2014, AIAA Journal, 52 (8), pp. 1733-1748
  • Characterization of Synthetic Jet Resonant Cavities. L. de Luca, M. Girfoglio, M. Chiatto, G. Coppola, 2015, Flinovia - Flow Induced Noise and Vibration Issues and Aspects, E. Ciappi et al. eds., 101-118, Springer International Publishing Switzerland

Numerical simulation: Volume of Fluid (VOF); High order numerical schemes for turbulent simulations

  • Insights on the impact of a plane drop on a thin liquid film, Coppola, G., Rocco, G., de Luca, L., 2011, Physics of Fluids, 23 (2), 022105
  • Single-wave Kelvin-Helmholtz instability in nonparallel channel flow. Orazzo, A., Coppola, G., de Luca, L., 2011, Atomization and Sprays, 21 (9), pp. 775-785
  • The evolution of a localized nonlinear wave of the Kelvin-Helmholtz instability with gravity. A. Orazzo and J. Hoepffner. Physics of Fluids, Vol 24, issue 11, 112106 (2012).
  • An efficient time advancing strategy for energy-preserving simulations, F. Capuano, G. Coppola, L. de Luca. Journal of Computational Physics, to appear.
  • Energy preserving turbulent simulations at a reduced computational cost, F. Capuano, G. Coppola, G. Balarac, L. de Luca. Journal of Computational Physics, under review.
  • A low-cost time-advancing strategy for energy-preserving turbulent simulations, F. Capuano, G. Coppola, G. Balarac, H. J. Bae and L. de Luca. Center for Turbulence Research (CTR), Stanford University. Proceedings of the Summer Program 2014.