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                <term xml:lang="en">hydrogen safety</term>
                <term xml:lang="en">stratification</term>
                <term xml:lang="en">air-helium mixture</term>
                <term xml:lang="en">buoyant jet</term>
                <term xml:lang="en">large eddy simulations</term>
                <term xml:lang="en">Stratification Hydrogen safety</term>
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              <p>In this article, numerical results from a highly resolved large eddy simulations (LES) of an air-helium buoyant jet developing in a two vented cavity are presented. The simulated configuration mimics the helium-release experiment carried out at CEA Saclay in the framework of security assessment of indoor used hydrogen-based systems. The height of the enclosure was chosen so that a laminar-turbulent transition occurs approximately at the middle of the upstream direction. An exterior region, of different spatial dimensions, has been modeled in the computational domain in order to move the boundary conditions away from the vent surface and to approach the natural inlet/outlet conditions. A sensi- tivity analysis regarding the size of the exterior region is presented to define the minimum horizontal extension so that the flow inside the cavity is not furthermore influenced by bigger computational domains. We observe mainly that applying an ambient equilibrium- hydrostatic pressure outlet condition directly on the surface of the vent reduces the vol- ume of the air inflow, and thus predicts larger helium mass inside the cavity, in contrary with the cases where an exterior region is considered. A qualification analysis shows that the sub-grid scale model plays a small role in the calculations and thus implies that the LES predictions approach the direct numerical simulation (DNS) solution. Analysis carried out on the time-averaged helium field depicts a concentration regime that is not classical in such configurations and thus the theoretical model used in safety pre-calculations can not be served.</p>
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        <org type="anrProject" xml:id="projanr-41846" status="VALID">
          <idno type="anr">ANR-10-LABX-0032</idno>
          <orgName>LaSIPS</orgName>
          <desc>LABORATORY FOR SYSTEMS AND ENGINEERING OF PARIS SACLAY</desc>
          <date type="start">2010</date>
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