PAT312, Section 41, December 2006 S41-1 Copyright 2007 MSC.Software Corporation SECTION 41 CONVECTION CONFIGURATIONS

PAT312, Section 41, December 2006 S41-2 Copyright 2007 MSC.Software Corporation

PAT312, Section 41, December 2006 S41-3 Copyright 2007 MSC.Software Corporation CONVECTION TEMPLATE l Convection templates specify a variable convective LBC l Convection Templates are defined in the template.dat.apnd file l Provide in MSC.Patran LBC input form: l Template ID (TID) number l Optional (spatially varying) data l An example of a convection template is given below

PAT312, Section 41, December 2006 S41-4 Copyright 2007 MSC.Software Corporation CONVECTION TEMPLATE l This template provides 2 GPs and 5 Material Property IDs (MPIDs) l Configuration 13 requires 5 GP values l GP1 is the surface area supplied by the MSC.Patran l GP2 and GP3 are characteristic lengths l Supplied in the Convection Coefficient LBC data box l The example assumes that GP2 and GP3 are supplied from the LBCs form l Can be supplied directly in the template (change # of GPs to 4) l GP4 is plate inclination angle l GP5 is the local gravitational constant l Configuration 13 requires 5 MPIDs l Density, Viscosity, coefficient of thermal expansion, specific heat and thermal conductivity of fluid l The MPIDs are 1041, 1042, 1043, 1000, and 1110

PAT312, Section 41, December 2006 S41-5 Copyright 2007 MSC.Software Corporation CONVECTION TEMPLATE (Cont.) Field of distance from edge defined in Fields/Spatial template.dat.apnd File ;TIDCFID#GP#MPID CONV17314 ;GPValues ;MPIDs See THERMAL User Manual, Ch 9 Section 9.1.4, Configuration 3 for a Description of this Convection Configuration. mat.dat.apnd File MPID 100 Constant Kelvin 1.0 Fluid Density MDATA 18.9 / MPID 200 Constant Kelvin 1.0 Fluid Absolute Viscosity MDATA 1.8E-0.4 / MPID 300 Constant Kelvin 1.0 Fluid Specific Heat MDATA / MPID 400 Constant Kelvin 1.0 Fluid Thermal Conductivity MDATA / CONVEC.DAT Created by MSC.Patran Thermal HN Area / / GP Values: 1- Resistor Surface Area (Generated by PATRAN) 2- f1(X_dist) (From f:X_dist in CONV Template 17) 3- f2(X_dist) (From f:X_dist in CONV Template 17) (From 3 rd GP in CONV Template 17)

PAT312, Section 41, December 2006 S41-6 Copyright 2007 MSC.Software Corporation ELEMENT UNIFORM & ELEMENT VARIABLE CONVECTION BOUNDARY CONDITION CONV/(Default): Element Uniform CONV/ Element Variable This does not work well with some configuration correlations (e.g. zero distance from the boundary layer leading edge) FLOW

PAT312, Section 41, December 2006 S41-7 Copyright 2007 MSC.Software Corporation

PAT312, Section 41, December 2006 S41-8 Copyright 2007 MSC.Software Corporation