The paper presents the numerical study of 3D flow and neutrally buoyant pollutant transport in a model atrium under conditions of test experiment by Thatcher et al. (2004) with a controlled uranine dye spill. For the Reynolds number of 2160 the Reynolds-Averaged Navier-Stokes approach was applied. Analysis of CFD predictability for a steady-state fully-developed regime and a transient process was done in comparison with the experimental data on contaminant concentration fields. For various positions of the contaminant source the ventilation effectiveness was computed and discussed.
The paper presents the experience of supercomputer modeling of airflow near a breathing thermal manikin located in the test room. The computations were performed under conditions of two ventilation scenarios: the mixing ventilation case with the dominant forced convection and the case of a very weak supply airflow with the dominant free convection. Two breathing models were considered in the study. The first model was a simplified one with the constant exhaling flow. The second model simulated both exhalation and inhalation with the sine time-dependence of inlet velocity. The calculations were carried out using the steady RANS approach closed with the standard
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turbulence model. The value of efficiency of parallelization is equal to unity in the range of the core number up to 280, except the runs with small core number. The computational data presented give a detailed information on the influence of exhalation/inhalation on the characteristics of the ventilation airflow and heat transfer near the human body.
The paper presents the numerical study of 3D unsteady buoyancy-induced water flow through a staggered tube bank typical for subsea cooling units used at seabed gas compression modules. For the Grashof number from the range of 105…106 parametric computations have been performed using direct numerical simulation of the draft water flow in the inter-tube space. For various arrangement of the bounding walls, the effect of the side flow on heat transfer is analyzed and discussed.
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