WS9-1 WORKSHOP 9 TRANSIENT THERMAL ANALYSIS OF A COOLING FIN NAS104, Workshop 9, March 2004 Copyright 2004 MSC.Software Corporation

WS9-2 NAS104, Workshop 9, March 2004 Copyright 2004 MSC.Software Corporation

WS9-3 NAS104, Workshop 9, March 2004 Copyright 2004 MSC.Software Corporation n Problem Description u Create a model of a fin subjected to transient convection loading. The 2D finite elements are to be created by meshing non- congruent surfaces. Mesh seeds will be used to force the elements/nodes to be congruent at the interface of the surfaces. A transient load case needs to be created so the convection can be applied as a step loading, hence causing the transient response of the model. Convection to ambient (temperature) loading is to be created on the free edges of select surfaces. After the transient analysis is complete the results file is to be attached to the MSC.Patran database, and the temperature results viewed.

WS9-4 NAS104, Workshop 9, March 2004 Copyright 2004 MSC.Software Corporation n Suggested Exercise Steps 1. Create a new database. 2. Specify the solver as MSC.Nastran Thermal 3. Create surfaces for fin 4. Create finite elements 5. Define material and element properties. 6. Create a transient load case 7. Create convection to ambient temperature 8. Perform the transient thermal analysis 9. Access the results file 10. Display the temperature results 11. Quit MSC.Patran.

WS9-5 NAS104, Workshop 9, March 2004 Copyright 2004 MSC.Software Corporation Step 1: Create A New Database Create a new database. a.File/New… b.Specify database name in File name as fin c.Click OK. a c a b

WS9-6 NAS104, Workshop 9, March 2004 Copyright 2004 MSC.Software Corporation Step 2: Specify the Solver as MSC.Nastran Thermal Specify the solver as Nastran a.Select Default for Tolerance. b.Select MSC.Nastran for Analysis Code. c.Select Thermal for Analysis Type. d.Click OK. c a b d

WS9-7 NAS104, Workshop 9, March 2004 Copyright 2004 MSC.Software Corporation Step 3: Create Surfaces for Fin Create two surfaces for modeling the cooling fin. a.Geometry: Create/Surface/ XYZ b.Enter for Vector Coordinates List. c.Enter [0 0 0] for Origin Coordinates List. d.Click Apply. e.Enter for Vector Coordinates List. f.Enter [ ] for Origin Coordinates List. g.Click Apply. c a b f d e g

WS9-8 NAS104, Workshop 9, March 2004 Copyright 2004 MSC.Software Corporation Step 3: Create Surfaces for Fin (Cont.)

WS9-9 NAS104, Workshop 9, March 2004 Copyright 2004 MSC.Software Corporation Step 4: Create the Finite Elements First, create the mesh seeds on surface edges. a.Elements: Create/Mesh Seed/ Uniform b.Select Number of Elements c.Enter 9 for Number d.Enter Surface in Curve List. e.Click Apply f.Enter 4 for Number g.Enter Surface in Curve List h.Click Apply i.Enter 3 for Number j.Enter Surface 2.3 in Curve List. k.Click Apply c a b f d e g h k i j

WS9-10 NAS104, Workshop 9, March 2004 Copyright 2004 MSC.Software Corporation Step 4: Create the Finite Elements (Cont.) IsoMesh the two surfaces a.Elements: Create/Mesh/Surface. b.Select Quad for Elem Shape. c.Select IsoMesh for Mesher d.Select Quad4 for Topology e.Enter Surface 1 2 in Surface List. f.Enter 0.16 for Value of Global Edge Length. g.Click Apply c a b f d e g

WS9-11 NAS104, Workshop 9, March 2004 Copyright 2004 MSC.Software Corporation Step 4: Create the Finite Elements (Cont.) Connect finite elements using equivalence. a.Elements: Equivalence/All/Tolerance Cube. b.Use for Equivalencing Tolerance c.Click Apply. c a b

WS9-12 NAS104, Workshop 9, March 2004 Copyright 2004 MSC.Software Corporation Step 5: Define Material and Element Property Define material. a.Materials: Create/Isotropic/Manual Input. b.Enter mat_1 for Material Name. c.Click Input Properties… d.Select Solid properties. e.Enter 6e-4 for Thermal Conductivity f.Enter for Specific Heat g.Enter.283 for Density. h.Click OK i.Click Apply c a b f d e g h i

WS9-13 NAS104, Workshop 9, March 2004 Copyright 2004 MSC.Software Corporation Step 5: Define Material and Element Property (Cont.) Define Property. a.Properties: Create/2D/Shell b.Enter fin for Property Set Name. c.Click Input Properties… d.Click in Material Name box and select mat_1 under Material Property Sets. e.Enter 1 for Thickness. f.Click OK. g.Enter Surface 1 2 for Select Members. h.Click Add. i.Click Apply c a b f d e i g h d

WS9-14 NAS104, Workshop 9, March 2004 Copyright 2004 MSC.Software Corporation Step 6: Create a Transient Load Case Create a transient load case so can create transient Loads/BCs. a.Load Case: Create b.Enter transient for Load Case Name. c.Select Time Dependent for Load Case Type. d.Click Apply. c a b d

WS9-15 NAS104, Workshop 9, March 2004 Copyright 2004 MSC.Software Corporation Step 7: Create Convection to Ambient Temperature Create convection boundary conditions. a.Loads/BCs: Create/Convection/Element Uniform b.Select To Ambient for Option c.Enter conv for New Set Name. d.Select 2D for Target Element Type. e.Click Input Data… f.Enter for Edge Convection Coef g.Enter 2500 for Ambient Temperature. h.Click OK. i.Click Select Application Region.. j.Enter Surface 1.1 for Select Surfaces or Edges. k.Click Add l.Click OK m.Click Apply c a b f d e m g h i l j k

WS9-16 NAS104, Workshop 9, March 2004 Copyright 2004 MSC.Software Corporation Step 7: Create Convection to Ambient Temperature (Cont.) Create convection boundary conditions (continued). a.Loads/BCs: Create/Convection/Element Uniform b.Select To Ambient for Option. c.Enter conv_right for New Set Name. d.Click Input Data.. e.Enter for Edge Convection Coef f.Enter 1000 for Ambient Temperature g.Click OK. h.Click Select Application Region… i.Enter Element 37: :12: :48: : for Select 2D Elements or Edges. j.Click Add. k.Click OK. l.Click Apply c a b f d e i g h l j k

WS9-17 NAS104, Workshop 9, March 2004 Copyright 2004 MSC.Software Corporation Step 8: Perform the Transient Thermal Analysis Perform the transient analysis. a.Analysis: Analyze/ Entire Model/Full Run. b.Enter fin for Job Name. c.Click Translation Parameters… d.Select XDB and Print for Data Output. e.Click OK. f.Click Solution Type… g.Select Transient Analysis. h.Click Solution Parameters. i.Enter 70 for Default Init Temperature. j.Click OK. k.Click OK. l.Continued. c a b f d e i g h j k

WS9-18 NAS104, Workshop 9, March 2004 Copyright 2004 MSC.Software Corporation Step 8: Perform the Transient Thermal Analysis (Cont.) Perform the transient analysis (continued). a.Analysis: Analyze/Entire Model/Full Run b.Click Subcases… c.Select transient for Available Subcases. d.Select transient for Available Load Cases. e.Click Subcase Parameters… f.Enter 0.1 for Initial Time Step g.Enter 20 for Number of Time Steps. h.Click OK. i.Click Apply. j.Continued. c a b f d e i g h

WS9-19 NAS104, Workshop 9, March 2004 Copyright 2004 MSC.Software Corporation Step 8: Perform the Transient Thermal Analysis (Cont.) Perform the transient analysis (continued). a.Analysis: Analyze/Entire Model/Full Run b.Click Subcase Select… c.Specify transient for Subcases Selected d.Click OK. e.Click Apply. c a b d e

WS9-20 NAS104, Workshop 9, March 2004 Copyright 2004 MSC.Software Corporation Step 9: Access the Results File Attach the XDB file. a.Analysis: Attach XDB/Result Entities/Local b.Click Select Results File… c.Select fin.xdb for File name. d.Click OK. e.Click Apply. c a b d e

WS9-21 NAS104, Workshop 9, March 2004 Copyright 2004 MSC.Software Corporation Step 10: Display the Temperature Results Display the results. a.Results: Create/Quick Plot b.Select SC1:DEFAULT, A1:Time=1.9 for Select Result Cases. c.Select Temperatures for Select Fringe Result. d.Click Apply. c a b d

WS9-22 NAS104, Workshop 9, March 2004 Copyright 2004 MSC.Software Corporation Step 11. Quit MSC.Patran Quit MSC.Patran a.Select File on the Menu Bar and select Quit from the drop down menu a