Patran Viewfactor Analysis

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		Model Creation for a Thermal Radiation Problem 3.1 Purpose 3.2 Radiation Enclosure Concept Definition of Enclosure The Enclosure ID Wavebands and Enclosures list2+s of the Use of Enclosures 3.3 Surface Orientation in Patran The Importance of Surface Orientation Determining Surface Orientation Correcting Improper Surface Orientations Suggested Practices for Creating Properly Oriented Surfaces 3.4 Specifying Radiation Boundary Conditions Using Patran Reference Manual (VFAC Boundary Condition) Purpose of the Viewfactor Form Form for the VFAC LBC Requirement for Oriented 2-D Surfaces Related to the VFAC LBC Neutral File Data Packet Created from the VFAC LBC 3.5 Advanced Features of the VFAC Boundary Condition Referencing Participating Media Radiation Nodes Referencing Ambient or Space Radiation Nodes Identifying a Surface as Being Convex Identifying a Surface as Not Obstructing the View Between Other Surface Pairs 3.6 Relationship of VFAC LBC Data to VFINDAT File Data 3.7 Patran Thermal TEMPLATEDAT Files for Surface Property Description Thermal Radiation Wavebands as Used in MSC Patran Thermal User’s Guide Radiation Resistor Types Used in Patran Thermal Patran Thermal MPIDs (Material Property IDs) Patran Thermal Material Property Definition VFAC Template Format Examples of TEMPLATEDAT Files for Thermal Radiation 3.8 Compatibility Requirements for Model and VFAC Templates Origin of the Problem Suggested Procedures to Avoid Compatibility Problems 3.9 Symmetry as Applied to the Model and Viewfactor Radiation Exchange The Purpose of Symmetry in Viewfactor Caveats Concerning the Use of Symmetry in Thermal Radiation Modeling Symmetry Operations Supported in Viewfactor list2+ of the Use of Symmetry in Thermal Radiation Modeling list2+ Which Appears Symmetric, But in Fact Is Not Symmetric Entering Viewfactor Symmetry Operations in the Patran Model