Massimo Germano

Research Interests

Turbulence in fluids and its representation. Multiscale decompositions of turbulent flows. The Navier-Stokes, the Large Eddy and the Reynolds equations. Reynolds modeling and subgrid scale modeling for the Large Eddy Simulation of turbulent flows. Hybrid RANS/LES modeling.

Bio

Massimo Germano was graduated in Physics at the University of Torino in 1965. In the same year he joined the Politecnico of Torino where he was finally appointed as Full Professor in Gasdynamics from 1981 to his retirement in 2012. His publications are devoted to many aspects of the fluid dynamics, they are mainly theoretical but always with a precise interest in the possible applications. Main results are the following. A system of orthogonal coordinates has been introduced in the study of the flow in helical pipes and more generally in pipes provided with a variable curvature and torsion of the central axis. This system of coordinates has been applied in many computations and it has contributed to clarify the effect of the curvature and the torsion on the axial and the secondary flows. In the field of turbulence modeling a new operational multiscale approach based on the generalized central moments and their properties has been produced. Principal application has been the dynamic procedure that significantly improves existing subgrid scale models for the Large Eddy Simulation of turbulent flows.

Education

• M.S. University of Turin (Italy), 1965

Positions

• Adjunct Professor in the Department of Civil and Environmental Engineering

Publications

• Errante M, Klein M, Ferrero A, Larocca F, Scovazzi G, Germano M. Mixed Averaging Procedures. Flow, Turbulence and Combustion. 2024 Apr 1;112(4):1001–8.
• Abbà A, Aliyoldashi MH, Cimarelli A, Germano M. Effect of Variable Density on Subgrid Scales. In: ERCOFTAC Series. 2024. p. 49–54.
• Germano M. Turbulence Without Fluctuations. In: From Kinetic Theory to Turbulence Modeling The Legacy of Carlo Cercignani. Springer Nature; 2023.
• Abbà A, Cimarelli A, Germano M. Dynamic tensorial eddy viscosity model: Effects of compressibility and of complex geometry. Physics of Fluids. 2022 Feb 1;34(2).
• Germano M. Turbulence: from Complexity to Variety. ArXiv. 2021.
• Grinstein FF, Saenz JA, Germano M. Coarse grained simulations of shock-driven turbulent material mixing. Physics of Fluids. 2021 Mar 1;33(3).
• Abbà A, Cimarelli A, Germano M. Dynamic Tensorial Eddy Viscosity and Turbulent Stresses. In: Springer Proceedings in Physics. 2021. p. 85–90.
• Grinstein FF, Saenz JA, Germano M. Dynamic Bridging for Coarse Grained Simulations of Turbulent Material Mixing. In: Springer Proceedings in Physics. 2021. p. 79–84.
• Ferrero A, Larocca F, Scovazzi G, Germano M. A Numerical Study of the Spanwise Turbulence Past a Cylinder Flow. In: Springer Proceedings in Physics. 2021. p. 91–6.
• Klein M, Germano M. Analysis and modelling of the commutation error. Fluids. 2021 Jan 1;6(1).
• Germano M, Abbà A, Cimarelli A, Ferrero A, Grinstein FF, Klein M, et al. The Filtering Approach as a Tool for Modeling and Analyzing Turbulence. In: Springer Proceedings in Physics. 2021. p. 67–77.
• Ferrero A, Larocca F, Germano M, Scovazzi G. A study on the statistical convergence of turbulence simulations around a cylinder. In: AIP Conference Proceedings. 2020.
• Germano M. The h-index and the Harmonic Mean. 2020.
• Grinstein FF, Saenz JA, Rauenzahn RM, Germano M, Israel DM. Dynamic bridging modeling for coarse grained simulations of shock driven turbulent mixing. Computers and Fluids. 2020 Mar 15;199.
• Klein M, Kasten C, Germano M. Decomposition of Turbulent Fluxes from Filtered Data and Application to Turbulent Premixed Combustion Modelling. Flow, Turbulence and Combustion. 2019 Aug 1;103(2):503–17.
• Cimarelli A, Abbà A, Germano M. General formalism for a reduced description and modelling of momentum and energy transfer in turbulence. Journal of Fluid Mechanics. 2019 May 10;866:865–96.
• Abbà A, Germano M, Nini M. A RANS assisted LES approach. In: ERCOFTAC Series. 2019. p. 159–65.
• Cimarelli A, Abbà A, Germano M. On the eddy viscosity associated with the subgrid stresses. In: ERCOFTAC Series. 2019. p. 101–6.
• Klein M, Scovazzi G, Germano M. On the richardson extrapolation of the reynolds stress with the systematic grid and model variation method. In: ERCOFTAC Series. 2019. p. 143–9.
• Cimarelli A, Crivellini A, Abbà A, Germano M. Reduced description and modelling of small-scale turbulence by means of a tensorial turbulent viscosity. In: Springer Proceedings in Physics. 2019. p. 21–6.
• Klein M, Germano M. Decomposition of the Reynolds stress from filtered data. Physical Review Fluids. 2018 Nov 1;3(11).
• Germano M. Blending and nudging in fluid dynamics: Some simple observations. Fluid Dynamics Research. 2017 Aug 11;49(5).
• Katul GG, Banerjee T, Cava D, Germano M, Porporato A. Generalized logarithmic scaling for high-order moments of the longitudinal velocity component explained by the random sweeping decorrelation hypothesis. Physics of Fluids. 2016 Sep 1;28(9).
• Nini M, Abbà A, Germano M, Restelli M. Analysis of a hybrid RANS/LES model using RANS reconstruction. In: Springer Proceedings in Physics. 2016. p. 83–6.
• Germano M. The similarity subgrid stresses associated to the approximate Van Cittert deconvolutions. Physics of Fluids. 2015 Mar 19;27(3).
• Germano M. On the hybrid RANS-LES of compressible flows. Notes on Numerical Fluid Mechanics and Multidisciplinary Design. 2015 Jan 1;130:253–63.
• Germano M, Abbá A, Arina R, Bonaventura L. On the extension of the eddy viscosity model to compressible flows. Physics of Fluids. 2014 Apr 14;26(4).
• Abbà A, Germano M. A mixed RANS/LES model applied to the channel flow. In: Springer Proceedings in Physics. 2014. p. 217–22.
• Germano M. The simplest decomposition of a turbulent field. Physica D: Nonlinear Phenomena. 2012 Feb 1;241(3):284–7.
• Abbá A, Rolfo S, Germano M. LES of the channel flow in a non aligned system of coordinates. In: Journal of Physics: Conference Series. 2011.
• Germano M. A new deconvolution approach. In: ERCOFTAC Series. 2011. p. 391–8.
• Germano M. The simplest LES. In: ERCOFTAC Series. 2010. p. 229–35.
• Germano M. A new deconvolution method for large eddy simulation. Physics of Fluids. 2009 Jan 1;21(4).
• Germano M. The filtering formulation of the mixed subgrid model. Physics of Fluids. 2008 Jan 1;20(7).
• Germanoa M. A direct relation between the filtered subgrid stress and the second order structure function. Physics of Fluids. 2007 Jan 1;19(3).
• Germano M. The elementary energy transfer between the two-point velocity mean and difference. Physics of Fluids. 2007 Jan 1;19(8).
• Sagaut P, Germano M. On the filtering paradigm for LES of flows with discontinuities. Journal of Turbulence. 2005 Dec 27;6.
• Germano M. Properties of the hybrid RANS/LES filter. Theoretical and Computational Fluid Dynamics. 2004 Aug 1;17(4):225–31.
• Germano M. On the physical effects of variable filtering lengths and times in LES. Fluid Mechanics and its Applications. 2004 Jan 1;65:3–11.
• Germano M. On a possible direct effect of the eddy viscosity gradient in turbulence modeling. Physics of Fluids. 2002 Jan 1;14(10):3745–7.
• Kuerten JGM, Geurts BJ, Vreman AW, Germano M. Dynamic inverse modeling and its testing in large-eddy simulations of the mixing layer. Physics of Fluids. 1999 Jan 1;11(12):3778–85.
• Germano M. Comment on 'Turbulence modeling for time-dependent RANS and VLES - A review'. AIAA Journal. 1998 Jan;36:1766–1766.
• Germano M. Comment on “turbulence modeling for time-dependent RANS and VLES: A review”. AIAA Journal. 1998 Jan 1;36(9):1766.
• Germano M. A statistical formulation of the dynamic model. Physics of Fluids. 1996 Jan 1;8(2):565–70.
• Germano M. Turbulence the filtering approach. Journal of Fluid Mechanics. 1992 Jan 1;238(325):325–36.
• Germano M, Piomelli U, Moin P, Cabot WH. A dynamic subgrid-scale eddy viscosity model. Physics of Fluids A. 1991 Jan 1;3(7):1760–5.
• Germano M, Piomelli U, Moin P, Cabot WH. Erratum: "A dynamic subgrid-scale eddy viscosity model" (Physics of Fluids A (1991) 3 (1760)). Physics of Fluids A. 1991 Jan 1;3(12):3128.
• Germano M. The Dean equations extended to a helical pipe flow. Journal of Fluid Mechanics. 1989 Jan 1;203(7):289–305.
• Germano M, Oggiano MS. Potential flow in helical pipes. Meccanica. 1987 Mar 1;22(1):8–13.
• Germano M. A proposal for a redefinition of the turbulent stresses in the filtered Navier–Stokes equations. The Physics of Fluids. 1986 Jul 1;29(7):2323–4.
• Germano M. Differential filters for the large eddy numerical simulation of turbulent flows. The Physics of Fluids. 1986 Jun 1;29(6):1755–7.
• Germano M. Differential filters of elliptic type. The Physics of Fluids. 1986 Jun 1;29(6):1757–8.
• Germano M. On the effect of torsion on a helical pipe flow. Journal of Fluid Mechanics. 1982 Jan 1;125(7):1–8.
• Germano M. Radiant energy extraction from a gasdynamic laser. Static behavior. Meccanica. 1975 Jun 1;10(2):114–9.
• Germano M, Oggiano MS, Onorato M. EFFECT OF BREMSSTRAHLUNG RADIATION UPON BLAST WAVES. In 1975. p. 149–57.
• Germano M. Line radiation in non local thermodynamic equilibrium. Meccanica. 1970 Sep 1;5(3):197–202.