PAT312, Section64, December 2006 S64-1 Copyright 2007 MSC.Software Corporation SECTION 64 ENCLOSURES AND CONVEX SURFACES. - презентация

1 PAT312, Section64, December 2006 S64-1 Copyright 2007 MSC.Software Corporation SECTION 64 ENCLOSURES AND CONVEX SURFACES

2 PAT312, Section64, December 2006 S64-2 Copyright 2007 MSC.Software Corporation

3 PAT312, Section64, December 2006 S64-3 Copyright 2007 MSC.Software Corporation ENCLOSURE A collection of thermally radiating surfaces which have the potential to see each other (radiate to each other) Open areas which these surfaces can potentially see Participating Media in the Enclosure Surfaces in different Enclosures cannot see each other Enclosures may be open or closed Open With or without ambient node Closed Recommend no ambient node Converting open enclosure to closed enclosure may improve viewfactor computation to ambient node Enclosing structures are artificial and must have appropriate ambient boundary conditions

4 PAT312, Section64, December 2006 S64-4 Copyright 2007 MSC.Software Corporation EXAMPLE

5 PAT312, Section64, December 2006 S64-5 Copyright 2007 MSC.Software Corporation EXAMPLE

6 PAT312, Section64, December 2006 S64-6 Copyright 2007 MSC.Software Corporation EXAMPLE

7 PAT312, Section64, December 2006 S64-7 Copyright 2007 MSC.Software Corporation EXAMPLE

8 PAT312, Section64, December 2006 S64-8 Copyright 2007 MSC.Software Corporation CONVERTING OPEN TO CLOSED ENCLOSURES

9 PAT312, Section64, December 2006 S64-9 Copyright 2007 MSC.Software Corporation CONVEX SURFACE A Convex surface is one for which no pair of points on the surface can see each other by direct line of sight Elements which share a Convex Surface ID cannot see each other by definition Flat surfaces are convex Examples: Exterior of sphere Each face on interior of cube Flag in view factor boundary condition Convex Surface ID Reduces VIEWFACTOR execution time

10 PAT312, Section64, December 2006 S64-10 Copyright 2007 MSC.Software Corporation CONVEX SURFACE

11 PAT312, Section64, December 2006 S64-11 Copyright 2007 MSC.Software Corporation NON-CONVEX OUTER SURFACE OF TORUS

12 PAT312, Section64, December 2006 S64-12 Copyright 2007 MSC.Software Corporation