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SUMMARY:CAE Geometry: Engineering Models That Support Integrated\, Automat
 ed Simulation - Dr Tom Cashman\, TranscenData Europe
DTSTART:20141204T111500Z
DTEND:20141204T121500Z
UID:TALK55619@talks.cam.ac.uk
CONTACT:Advait Sarkar
DESCRIPTION:CAD (Computer-Aided Design) and CAE (Computer-Aided Engineerin
 g) models are built to meet different requirements and serve very differen
 t purposes\, resulting in a significant and costly disconnect between CAD 
 and CAE systems. We explore three longstanding barriers to CAD/CAE integra
 tion: the challenge of finding high-performance meshes\, the missing link 
 in both directions between design and analysis\, and the fundamental limit
 ations of today’s CAD models.\nWe discuss the need for domain partitioni
 ng\, in order to generate meshes that give the best possible results with 
 the shortest possible computation time. We argue that the idealisations of
  a CAD model that are necessary for CAE quickly introduce a disparity betw
 een these models\, which is usually resolved by manual processing. We also
  describe the theoretical reasons why CAD models almost universally contai
 n gaps and inconsistencies.\nWe address components of all three of these i
 ssues by introducing alternative geometry representations that we describe
  as “CAE geometry”\, with the key characteristics that they are smooth
 \, consistent and watertight descriptions. One possibility is realised by 
 representing face geometry with a smooth curved triangle mesh\, so that CA
 D model edges are able to define the exact join between two neighbouring f
 aces. We describe the direct use of this representation in structural FEA\
 , to obtain a deformed version of the geometry\, and the automated convers
 ion of such a representation back to a standard CAD model.\nAn alternative
  watertight description is provided by computing the Medial Object of a pa
 rt\, making it possible to automatically generate domain blockings that ar
 e suitable for hex meshing. This allows changes to a design to be automati
 cally reflected in the analysis mesh\, while retaining the mesh’s effici
 ency and fidelity.\nWe conclude that future CAE will be facilitated by too
 ls that automate the bidirectional flow of data between the CAD and CAE di
 sciplines\, making it possible to pursue an increasingly integrated proces
 s.
LOCATION:Rainbow Seminar Room (SS03)\, Computer Laboratory
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