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Geodise Component – CAD system

Aim – provides robust parametric CAD models for CFD simulation; Requirements for CAD models Data flows and problem specific data definition RR Negatively Scarfed Engine Intake. Geodise Component – CAD system. Overview. Wenbin Song Email: w.song@soton.ac.uk Geodise Project, e-Science Centre

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Geodise Component – CAD system

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  1. Aim – provides robust parametric CAD models for CFD simulation; Requirements for CAD models Data flows and problem specific data definition RR Negatively Scarfed Engine Intake Geodise Component – CAD system Overview Wenbin Song Email: w.song@soton.ac.uk Geodise Project, e-Science Centre School of Engineering Sciences University of Southampton

  2. Requirements for CAD model: Parametric: ability to respond automatically to the latest parametric changes; Generic: ability to produce different geometries from one model; Robust: low rate of failure for combinations of parameters FEM (ANSYS, SC03) Pro/Engineer CFD (Fluent, Hydra) ICAD Cost estimation Unigraphics IGES/STEP, CADfix Geodise Component – CAD system

  3. Command script Condor, Grid/Web service Meshing Command script Condor; Grid/Web service Solver Pro/E model part file; Trail file; Input data file; IGES/STEP file; Gambit Journal file; Mesh file; Fluent journal file; Command script Condor, Grid/Web service CAD Geodise Component – CAD system Dataflow in simulation • CADfix: • Seamless geometry exchange is not effortless, but often problematic, usually requires repairs: - solution is robust modelling in CAD systems, such as avoiding very short entities, etc.

  4. Geodise Component – CAD system Availability of CAD system: • Pro/Engineering (version 2001200 for Windows), running locally; Model data files for geometry creation: • Model part file (defining the shape paramterization, input parameters, etc.) • Trail file (script file used to generate IGES/STEP file in batch mode); • Input file (text file containing name-value pairs); • Three files need to be in local working directory and and resulting IGES file is also stored in it and with the same name; • MATLAB function proe_iges() running locally generates an IGES file based on input file; Transfer of IGES/STEP file for mesh generation: • Use of gd_putfile to transfer geometry file and Gambit journal file onto remote server;

  5. Geodise Component – CAD system Application One: Negatively Scarfed Engine Intake (Rolls-Royce) Problems definition: maximize noise reduction without (significant) loss aerodynamic performance for all operating conditions. Parameters: Intake geometry is defined using Pro/E by a list of parameters, parameters that are expected to be used in optimisation are listed below: Scarf_angle = 10 (degree), shown as d1 (d1=90-scarf_angle) in the following figure; Top_radius = 1243 (mm), shown as d220; Bottom_radius = 1390 (mm), shown as d221; Side_radius = 1430 (mm), not shown; Fanface_radius = 1241 (mm), not shown; Fanface_axial_distance = 1818.43 (mm), shown as d2; Center offset = 5 (mm), shown as d5; Figure: (a) A3XX-100; (b) three dimensional shape of negatively scarfed engine intake; (c) parameters of intake vertical layout.

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