From GIS to CFD - a CAD solution for data transfer between GIS and CFD-

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From GIS to CFD- a CAD solution for data
transfer between GIS and CFD-
Hans-W. Mindt und Wolfgang Ottow
GbR Ingenieurbüro für angewandte
Strömungsmechanik Kruppstr. 82 100, 45145
Essen, Germany info_at_a-CFD.de www.a-CFD.de

• Hans-Wilfried Mindt
• (Dipl.-Ing.)

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Contents

• Problem determination
• Points of interrests
• Fileformates used by GIS
• Model topology
• By splines (Points interpolated)
• By points (Points exactly by using triangles)
• Solution
• Summary
• Discussion

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Problem determination

• CFD solution in Environment
• Exhaust emission
• Condensation
• Fresh-air supply for turbines and generators
• Catastrophe scenarios

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Problem determination

• CFD solution in Environment
• Power supply station
• Residential district
• Fresh-air supply for turbines and generators
• Catastrophe scenarios

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Problem determination

• CFD solution in Environment

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Model topology

• Object based on CAD

Points Lines (splines) Surfaces (bicubic)
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Model topology

• Object based on CAD

STL-Data file (output)
facett
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Model topologic
Data-Set from GIS or related programs

• Points created opto-photografically
• Triangulars transfered into IGES Format
• IGES-Format transfered via CAD-System into
  STL-format
• STL-File readeble by PHOENICS
• Approximatly 1 day working time

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Model topologic
Data-Set from GIS or related programs

• Rounded shape
• Cliffs possible
• Facetts

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Model topology
Data-Set from GIS or related programs

• Curved surface as approximation of mountains, but
  cliffs and sharp rocks are possible to build.

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Model topology
Data-Set used in Rapid-prototyping branch

• Catalytic Reactor Bed

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Solution
Objects from Library
Object form CAD-System
Pressure distribution on the surface
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Solution

• Streamlines
• Pressure distribution on surface

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Summary

• A simple and easy to use data transfer between
  GIS and CFD is useful.
• The STL-Format is not established like in the
  rapid-prototype branch
• All data-sets are sorted in 2 ½ D
• We prefere
• Triangulation by third party product
• Transfer via iges into CAD-system
• Cutting and adding of parts inside of CAD-System
• Transfer of final geometric landscape (buildings
  can be included) via STL-File into CFD-System

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Discussion