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ICGeminus Boeing Project Contract No.EVE-16-2929 <br /> Technology Development CEI Project No. 160731 <br /> HIGH BAY AIR SUPPLY <br /> STACKERCRANES(8) \ <br /> :.---;:s LEAK PATHS ALONG TOP,BOTTOM <br /> AND SIDES OF HANGAR DOORS <br /> LOW BAY AIR SUPPLY 4P11171°I' �''a' <br /> Arai 1 * fr <br /> . <br /> LANDING GEAR WRAP <br /> (NOSE AND MAIN) <br /> iR <br /> TAIL STANDS(2) <br /> ,�-! LOW BAY AIR SUPPLY <br /> EMPENNAGE STAND ` <br /> WING STANDS{2) <br /> FLOOR AIR EXHAUSTS <br /> Figure 1: Original And Upgraded Hangar 45-04 Major Model Components Utilized In <br /> The Three-Dimensional CFD Flow Analysis. <br /> 2.1 CFD Software,Discretization & Flow Physics Model <br /> 2.1.1 CFD Software <br /> GTD utilized Siemens' STAR/CCM+ multi-physics commercial flow simulation software <br /> (see https://mdx.plm.automation.siemens.com/star-ccm-plus) and implemented a steady-state (or <br /> unsteady depending on the case/scenario) incompressible, isothermal, three dimensional, <br /> Reynolds-Averaged Navier-Stokes (RANS) turbulent flow analysis of the air flow through the <br /> 45-04 building internal space. GTD has utilized STAR/CCM+for several years to simulate flows <br /> across a broad range of applications and has utilized this software package to perform design and <br /> analysis of similar flows in other Boeing-related facilities projects. The computational domain <br /> consisted of simplified 3D interior models of Boeing Buildings (including any significant <br /> structures affecting the airflow), simplified aircraft representations, and work platforms. An un- <br /> structured orthogonal "trimmer" mesh was implemented to discretize the computational domain. <br /> Coarse mesh wall functions are utilized on surfaces that have low velocities and/or do not have a <br /> species nor thermal flux while a full laminar sub-layer meshing is used on high gradient surfaces. <br /> 2.1.2 Analysis Cases & Operational Scenarios <br /> The CFD analysis is divided into analysis cases Case 1, Case 2, and Case 3, as shown in <br /> Figure 2. Case 1 is intended to validate the CFD model by replicating operating conditions <br /> present when airflow velocity measurements were taken in the un-modified 45-04 hangar (see <br /> Section 3 for details) as well as representative conditions during which % of LEL measurements <br /> 5 <br />