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Particle laden homogeneous shear flow in the two-way coupling regime: Exact Regularized Point Particle method

DOI: 10.1615/ICHMT.2015.THMT-15.1120
pages 527-530

Carlo M. Casciola
Department of Mechanics and Aeronautics, 'Sapienza' University of Rome, Via Eudossiana 18, 00184 Rome, Italy

Paolo Gualtieri
Dipartimento di Ingegneria Meccanica e Aerospaziale, 'Sapienza' University, Via Eudossiana 18, 00184 Roma, Italy

F. Battista
Dipartimento di Ingegneria Meccanica e Aerospaziale, 'Sapienza' University, Via Eudossiana 18, 00184 Roma, Italy

Résumé

A new approach, dubbed the Exact Regularized Point Particle (ERPP) method [1], is used to capture the turbulence modulation by hundred thousands of small inertial particles. The proposed method overcomes some drawbacks which arise in some circumstances in available approaches like, e.g., the Particle In Cell (PIC) method introduced by Crowe and coworkers since 1977.
Numerical results concerning a homogeneous shear flow at moderate values of the Reynolds number laden with hundred thousand of small inertial particles are discussed documenting the turbulence modification in the so-called two-way coupling regime, in a range of control parameters unaccessible to the available approaches.
In particular we provide evidence that the presence of the particles induces modifications of the turbulent fluctuation level both at large and at small scales. As will be discussed in detail in the extended contribution the modulation is selective, i.e. anisotropic, leaving almost unaltered velocity fluctuation in the stream-wise direction and depleting the cross-flow components. These effects are associated to the formation of small scale clusters which are preferentially oriented by the mean flow.

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