14 research outputs found
Validation methodologies for turbulent variable density flows: A jet case study
Comparisons studies between simulated variable density turbulent flows often
consist of direct graphical representations where the level of agreement is
determined by eye. This work demonstrates a formal validation methodology using
an existing validation framework to examine the agreement between a simulated
variable density jet flow and corresponding experimental data. Implicit large
eddy simulations (ILES's) of a round jet and a plane jet with density ratio were simulated using the compressible hydrodynamic code xRAGE. The jet
growth, characterized by the spreading rates, was compared, and the difference
between the simulations and the experiment was examined through jet structure
diagnostics. The spreading rates were found to be larger than the experimental
values, primarily due to resolution issues in the simulations, a fact that is
quantified by the validation metric analysis.Comment: 19 pages, 13 figure