Аннотация
This work describes the modelling of liquid hydrogen release experiments
using the ADREA-HF 3-D time dependent finite volume code for cloud
dispersion, jointly developed by DEMOKRITOS and JRC-Ispra. The experiments
were performed by Batelle Ingenieurtechnik for BAM (Bundesanstalt
fur Materialforschung und Prufung), Berlin, in the frame of the Euro-Quebec-Hydro-Hydrogen-Pilot-Project
and they mainly deal with LH2 near ground releases between buildings.
In the present study, the experimental trial #5 was assumed for simulation
due to the fact that in this release the largest number of sensor
readings were obtained. The simulations illustrated the complex behaviour
of LH2 dispersion in presence of buildings, characterized by complicated
wind patterns, plume back flow near the source, dense gas behaviour
at near range and significant buoyant behaviour at the far range.
The simulations showed the strong effect of ground heating in the
LH2 dispersion. The model also revealed major features of the dispersion
that had to do with the "dense" behaviour of the cold hydrogen and
the buoyant behaviour of the "warming-up" gas as well as the interaction
of the building and the release wake. Such a behaviour was in qualitative
and even quantitative agreement with the experiment. The results
are given in terms of concentration time series, scatter plots, contour
plots, wind field vector plots and 3-D concentration wireframes.
Given all experiment uncertainties, the model gives reasonable results
on concentrations levels.
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