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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.5

ISSN Print: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v12.i3.30
pages 251-269

NUMERICAL PROCEDURES TO GENERATE AND TO VISUALIZE FLOW FIELDS FROM ANALYTICAL OR EXPERIMENTAL STATISTICS: TURBULENT VELOCITY, FLUCTUATING SCALARS, AND VARIABLE DENSITY SPRAYS

Julien Reveillon
CORIA-UMR 6614 – Normandie Université, CNRS-Université et INSA de Rouen, Campus Universitaire du Madrillet, 76800 Saint Etienne du Rouvray, France

ABSTRACT

Numerical simulations of the exact (DNS) or filtered (LES) Navier-Stokes equations are of great importance for analysis of physical phenomena and development of models for any turbulent flow. However, these tools need accurate initial fields and adapted treatments for the boundary conditions. This paper suggests some numerical procedures to generate any turbulent field with prescribed parameters. These fields may be used as initial or boundary conditions for any DNS or LES computation but also as a way to visualize a synthetic turbulent field reconstructed from experimental statistics. First of all, the Rogallo method for the generation of a turbulent velocity-vector field is given in detail. Then, a new procedure to generate any scalar field with prescribed statistics and characteristic length scales is proposed. Eventually, a procedure to initialize the initial dispersion of a Lagrangian spray field is presented. Again, the characteristic sizes of the clusters of droplets and their local density are entirely controlled.


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