139 citations · 394 across the 19 of their papers we have counts for
21 papers
Conjugate heat transfer in turbulent pipe flow with azimuthally non-uniform heating
Jonathan Neuhauser, Davide Gatti, Bettina Frohnapfel
Turbulent conjugate heat transfer (CHT) in pipes with azimuthally non-uniform heating is studied theoretically and numerically with a focus on low- fluids. While the i…
Handling geometric singularities efficiently with the immersed-boundary method: application to riblets
Stefano Cipelli, Alessandro Chiarini, Maurizio Quadrio +2
We present an enhancement of classical immersed boundary methods for the direct numerical simulation of the incompressible Navier-Stokes equations, designed to efficiently cope wit…
Critical assessment of RANS Models for Turbulent Heat Transfer in Low-Prandtl-Number Forced Convection
Luca Marocco, Jonathan Schmitt, Jonathan Neuhauser +2
RANS modeling of turbulent heat transfer in liquid metals remains challenging because the very low Prandtl number weakens the similarity between momentum and thermal transport. Sev…
The aerodynamic performance of a transonic airfoil with spanwise forcing
Niccolò Berizzi, Davide Gatti, Giulio Soldati +2
Spanwise wall forcing in the form of streamwise-travelling waves is applied to the suction side of a transonic airfoil with a shock wave to reduce aerodynamic drag. The study, cond…
Turbulent skin-friction drag reduction via spanwise forcing at high Reynolds number
Davide Gatti, Maurizio Quadrio, Alessandro Chiarini +2
We address the Reynolds-number dependence of the turbulent skin-friction drag reduction induced by streamwise-travelling waves of spanwise wall oscillations. The study relies on di…
Turbulent drag reduction with streamwise travelling waves in the compressible regime
Federica Gattere, Massimo Zanolini, Davide Gatti +2
The ability of streamwise-travelling waves of spanwise velocity to reduce the turbulent skin friction drag is assessed in the compressible regime. Direct numerical simulations are…
Coherent near-wall structures and drag reduction by spanwise forcing
Emanuele Gallorini, Maurizio Quadrio, Davide Gatti
The effect of streamwise-traveling waves of spanwise wall velocity (StTW) on the quasi-streamwise vortices (QSV) populating the near-wall region of turbulent channels is studied vi…
Structure of turbulence in the flow around a rectangular cylinder
Alessandro Chiarini, Davide Gatti, Andrea Cimarelli +1
The separating and reattaching turbulent flow past a rectangular cylinder is studied to describe how small and large scales contribute to the sustaining mechanism of the velocity f…
Drag reduction on a transonic airfoil
Maurizio Quadrio, Alessandro Chiarini, Jacopo Banchetti +3
Flow control for turbulent skin-friction drag reduction is applied to a transonic airfoil to improve its aerodynamic performance. The study is based on direct numerical simulations…
Ascending-descending and direct-inverse cascades of Reynolds stresses in turbulent Couette flow
Alessandro Chiarini, Mariadebora Mauriello, Davide Gatti +1
The interaction between small- and large-scale structures, and the coexisting bottom-up and top-down processes are studied in a turbulent plane Couette flow, where space-filling lo…
Effects of sweeps and ejections on amplitude modulation in a turbulent channel flow
A. Andreolli, D. Gatti, R. Vinuesa +2
Conditional averages are used to evaluate the effect of sweeps and ejections on amplitude modulation. This is done numerically with a direct numerical simulation (DNS) of a channel…
Tripping and laminar--turbulent transition: Implementation in RANS--EVM
N. Tabatabaei, G. Fahland, A. Stroh +5
Fundamental fluid--mechanics studies and many engineering developments are based on tripped cases. Therefore, it is essential for CFD simulations to replicate the same forced trans…
Global energy budgets in turbulent Couette and Poiseuille flows
Andrea Andreolli, Maurizio Quadrio, Davide Gatti
Turbulent plane Poiseuille and Couette flows share the same geometry, but produce their flow rate owing to different external drivers, pressure gradient and shear respectively. By…
Decomposition of the mean friction drag on a NACA4412 airfoil under uniform blowing/suction
Yitong Fan, Marco Atzori, Ricardo Vinuesa +3
The application of drag-control strategies on canonical wall-bounded turbulence, such as periodic channel and zero- or adverse-pressure-gradient boundary layers, raises the questio…
Structure function tensor equations in inhomogeneous turbulence
Davide Gatti, Alessandro Chiarini, Andrea Cimarelli +1
Exact budget equations for the second-order structure function tensor are used to study the two-point statistics of velocity fluctuations in inhomogeneo…
Objective barriers to the transport of dynamically active vector fields
George Haller, Stergios Katsanoulis, Markus Holzner +2
We derive a theory for material surfaces that maximally inhibit the diffusive transport of a dynamically active vector field, such as the linear momentum, the angular momentum or t…
An Efficient Numerical Method for the Generalised Kolmogorov Equation
Davide Gatti, Alberto Remigi, Alessandro Chiarini +2
An efficient algorithm for computing the terms appearing in the Generalised Kolmogorov Equation (GKE) written for the indefinite plane channel flow is presented. The algorithm, whi…
Revisiting the amplitude modulation in wall-bounded turbulence: towards a robust definition
E. Dogan, R. Örlü, D. Gatti +2
The present study revisits the amplitude modulation phenomenon, specifically for the robustness in its quantification. To achieve this, a well-resolved large-eddy simulation (LES)…
Global energy fluxes in fully-developed turbulent channels with flow control
Davide Gatti, Andrea Cimarelli, Yosuke Hasegawa +2
This paper addresses the integral energy fluxes in natural and controlled turbulent channel flows, where active skin-friction drag reduction techniques allow a more efficient use o…
Reynolds-dependence of turbulent skin-friction drag reduction induced by spanwise forcing
Davide Gatti, Maurizio Quadrio
This paper examines how increasing the value of the Reynolds number affects the ability of spanwise-forcing techniques to yield turbulent skin-friction drag reduction. The con…
Performance losses of drag-reducing spanwise forcing at moderate values of the Reynolds number
Davide Gatti, Maurizio Quadrio
A fundamental problem in the field of turbulent skin-friction drag reduction is to determine the performance of the available control techniques at high values of the Reynolds numb…