Geodise Component

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Geodise Component CAD system
Overview
Wenbin Song Email w.song_at_soton.ac.uk Geodise
Project, e-Science Centre School of Engineering
Sciences University of Southampton

• 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

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Geodise Component CAD system

• 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

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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.

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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

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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 (d190-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.