Databases 

This page contains high-resolution long-averaged statistical properties and correlations computed from Front-Tracking simulations performed with a modified version of the open-source code TrioCFD (called TrioIJK).

The first set of simulations are performed at a low Reynolds friction number of Re_tau=127 for different configurations of bubbles :

• • Ss : Small (Eo=0.45) spherical monodispersed bubbles -> SPHE127_Ss 

• • • • Sb : Bigger (Eo=1.36) spherical monodispersed bubbles -> SPHE127_Sb 

    • • D : Large (Eo=4.5) deformable monodispersed bubbles -> SPHE127_D 

    • • B : Bidispersed bubbles (small and large, Eo=0.45 and Eo=4.5) -> SPHE127_B 

    • • SP : Reference simulation without bubbles (single-phase flow) -> SP127_SP 

• These 5 simulations are presented in details in the publication:

A. du Cluzeau, G. Bois, A. Toutant. Analysis and modeling of Reynolds stresses in turbulent bubbly up-flows from Direct Numerical Simulations, Journal of Fluid Mechanics, Vol 866, May 2019, pp 132-168, link

Please refer to this publication when using this data.

Other simulations are available at a higher Reynolds number (4cases_Ret180) :

• • S180 : spherical bubbles (Eo=0.45) in low gravity conditions 

• • • • S180g8 : spherical bubbles (Eo=0.45) in standard gravity conditions  

        • • D180 : deformable bubbles (Eo=3.6) in low gravity conditions 

        • • • • D180g8 : deformable bubbles (Eo=3.6) in standard gravity conditions

These 4 simulations are presented in details in the publication:

Description of the archive files   

Each database is a collection of files with statistics from a numerical solution of the one-fluid Navier-Stokes equations ranging from simple averaged quantities (void fraction, velocity, pressure…) to high-order statistics required for the Reynolds stresses equations. The terms in the budget of the liquid (resp. vapor or mixture) momentum equations are also available in '*_QdM_liquid.txt' files (resp. vapor or monofluid). The contributions to the budget of Reynolds stresses are given in the file '*_Rij_transport_equation.txt'. A python-based toolbox has been developed to post-process those statistics (available on demand). An explicit description of the nomenclature used in '*txt' files is presented in description_Ret127.pdf available here.

In addition, local probes (with the extension .son) for the phase indicator (CHI) or the velocity (VX, VY, VZ) are available. Their locations are given in the files headers. The "out" files contains bubble-related information such as the position of their barycenter ('*bubbles_centre_*'), the height of the box enveloping the bubble '*bulles_h*' or their surface or volume. In these files, the first column is the time and then each column refers to a different bubble. 

Warning : in the "son" or "out" files, the directions y and z are switched compared to the article description. The "txt" files are in line with the publication.