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DIRECT NUMERICAL SIMULATION OF THE PRIMARY BREAKUP OF A SPATIALLY DEVELOPING LIQUID JET

Markus Klein
Institute for Energy and Powerplant Technology (EKT), TU-Darmstadt, Petersenstr. 30, 64287, Darmstadt, Germany

Amsini Sadiki
Institute of Energy and Power Plant Technology, Technische Universität Darmstadt, 64287 Darmstadt, Germany

Johannes Janicka
Institute of Energy and Power Plant Technology, TU Darmstadt, Jovanka-Bontschits-Strasse 2, 64287 Darmstadt, Germany; Darmstadt Graduate School of Excellence Energy Science and Engineering, TU Darmstadt, Jovanka-Bontschits-Strasse 2, 64287 Darmstadt, Germany

要約

Although the number of publications in the area of two phase flows increases, there are only a few DNS studies concerned with the primary breakup of a liquid film, probably due to the fact that often high density ratios and the capillary forces lead to many numerical problems. In addition, prescribing realistic velocity inlet data at the inflow boundary, requires a sophisticated procedure in order to obtain physically realistic prediction results. Therefore the focus of this paper is to perform a three dimensional, spatially developing simulation of a liquid jet exhausting into a gaseous atmosphere. Special attention will be paid to the question if the results of 3D and 2D simulation are comparable, the latter being attractive in view of saving computing time, when doing a stability analysis of such a flow (not only in the context of DNS).