WS8-1 WORKSHOP 8 TRANSIENT THERMAL NAS104, Workshop 8, March 2004 Copyright 2004 MSC.Software Corporation

WS8-2 NAS104, Workshop 8, March 2004 Copyright 2004 MSC.Software Corporation

WS8-3 NAS104, Workshop 8, March 2004 Copyright 2004 MSC.Software Corporation n Problem Description This exercise is an example of a transient thermal analysis. It is an extension of a steady state modeling exercise done earlier. Shown below is a drawing of the model that is to be created, and suggested steps for its construction.

WS8-4 NAS104, Workshop 8, March 2004 Copyright 2004 MSC.Software Corporation

WS8-5 NAS104, Workshop 8, March 2004 Copyright 2004 MSC.Software Corporation n Suggested Exercise Steps 1. Open an existing database. 2. Define time dependent function. 3. Create a transient load case. 4. Apply time dependent heat flux. 5. Apply transient volumetric heat generation. 6. Select Loads/BCs for load case transient. 7. Perform the transient thermal analysis. 8. Attach the results file. 9. Display the temperature results. 10. Step 10: Quit MSC.Patran.

WS8-6 NAS104, Workshop 8, March 2004 Copyright 2004 MSC.Software Corporation Step 1: Open an Existing Database Open existing database conduction.db a.File/Open… b.Select conduction.db for File name c.Click OK c b

WS8-7 NAS104, Workshop 8, March 2004 Copyright 2004 MSC.Software Corporation Step 2: Define Time Dependent Function Define a time dependent function. a.Fields:Create/Non Spatial/ Tabular Input b.Enter flux_time for Field Name. c.Select Real for Scalar Field type. d.Select Time(t) for Table. Definition e.Click Input Data… f.See figure for data. g.Click Ok h.Click Apply c a b g h f d e

WS8-8 NAS104, Workshop 8, March 2004 Copyright 2004 MSC.Software Corporation Step 2: Define Time Dependent Function (Cont.) Define time dependent function a.Fields: Create/Non Spatial/ Tabular Input. b.Enter qvol_time for Field Name. c.Select Real for Scalar Field Type d.Click Input Data… e.See the figure for data f.Click OK g.Click Apply c a b g f d e

WS8-9 NAS104, Workshop 8, March 2004 Copyright 2004 MSC.Software Corporation Step 3: Create a Transient Load Case Create a transient load case add two existing load set a.Load Cases: Create b.Enter transient for Load Case Name. c.Select Time Dependent for Load Case Type. d.Click Apply. c a b e

WS8-10 NAS104, Workshop 8, March 2004 Copyright 2004 MSC.Software Corporation Step 4: Apply Time Dependent Heat Flux Apply transient heat flux on an edge a.Loads/BCs: Create/ Applied Heat/ Element Uniform. b.Select Normal Fluxes for Option. c.Enter tran_flux for New Set Name. d.Select 2D for Target Element Type. e.Click Input Data… f.Select Edge for Surface Option. g.Enter 5000 for Edge Heat Flux. h.Select the field flux_time for Time Dependent Fields. i.Click OK. j.Continued c a b g h f d e i Note: the edge heat flux(5000) and field flux_time are multiplied together

WS8-11 NAS104, Workshop 8, March 2004 Copyright 2004 MSC.Software Corporation Step 4: Apply Time Dependent Heat Flux (Cont.) Apply transient heat flux on an edge a.Select Select Application Region… b.Select Geometry for Geometry Filter. c.Select Surface 1.3 for Select Surfaces or Edges. d.Click Add. e.Click OK. f.Click Apply. c a b d e f

WS8-12 NAS104, Workshop 8, March 2004 Copyright 2004 MSC.Software Corporation Step 5: Apply Transient Volumetric Heat Generation Apply transient volumetric heat generation inside the plate. a.Loads/BCs: Create/ Applied Heat/ Element Uniform. b.Select Volumetric Generation for Option. c.Enter tran_qvol for New Set Name. d.Select 2D for Target Element Type. e.Click Input Data… f.Select Basic for Form Type. g.Specify 1.0 for Volumetric Heat Generation. h.Select qvol_time for Time Dependent Fields. i.Click OK. j.Select Select Application Region… c a b j h i f d e g

WS8-13 NAS104, Workshop 8, March 2004 Copyright 2004 MSC.Software Corporation Step 5: Apply Transient Volumetric Heat Generation (Cont.) a.Select FEM for Geometry Filter b.See Figure for Select 2D elements. c.Click Add. d.Click OK. e.Click Apply. c a b d e b

WS8-14 NAS104, Workshop 8, March 2004 Copyright 2004 MSC.Software Corporation Step 6: Select Loads/BCs for Load Case transient Modify load case transient to include all needed Loads/BCs nLoad Cases: Modify nSelect transient under Select Load Case to Modify nSelect Loads/BCs for the fixed temperature and convection. nThere will be four LBCs for transient. nClick OK. nClick Apply. a b c d

WS8-15 NAS104, Workshop 8, March 2004 Copyright 2004 MSC.Software Corporation Step 7: Perform the Transient Thermal Analysis Perform the transient analysis a.Analysis: Analyze/Entire Model/Full Run. b.Enter tran for Job Name. c.Click Solution Type… d.Select Transient Analysis. e.Solution Parameters… f.Default Init Temperature 50 g.Click OK. h.Click OK i.Continued d e f g h a c b

WS8-16 NAS104, Workshop 8, March 2004 Copyright 2004 MSC.Software Corporation Step 7: Perform the Transient Thermal Analysis (Cont.) Perform the transient analysis a.Click Subcases. b.Select transient for Available Subcases. c.Select transient for Available Load Cases. d.Select Subcase Parameters… e.Set Initial Time Step to 10.0 f.Click OK. g.Click Apply. h.Continued c a b g d e f Note: the total solution time is about 10 * 100 = e

WS8-17 NAS104, Workshop 8, March 2004 Copyright 2004 MSC.Software Corporation Step 7: Perform the Transient Thermal Analysis (Cont.) c b Perform the transient analysis a.Click Subcase Select… b.Select transient for Subcases For Solution Sequence: 159 c.Click OK. d.Click Apply a d

WS8-18 NAS104, Workshop 8, March 2004 Copyright 2004 MSC.Software Corporation Step 8: Attach the Results File Attach the XDB file a.Analysis: Attach XDB/Result Entities/Local. b.Click Select Results File… c.Select tran.xdb. d.Click OK. e.Click Apply. c a b d e

WS8-19 NAS104, Workshop 8, March 2004 Copyright 2004 MSC.Software Corporation Step 9: Display the Temperature Results Display the results a.Results: Create/Quick Plot. b.Select SC1: TRANSIENT, A2 Time=1020 for Select Result Cases. c.Select Temperatures for Select Fringe Result. d.Click Apply. c a b d

WS8-20 NAS104, Workshop 8, March 2004 Copyright 2004 MSC.Software Corporation Step 9: Display the Temperature Results (Cont.) Display the result a.Results: Create/Graph/Y vs X. b.Click SC1: TRANSIENT, A3:Time=1020 for Select Result Case(s). c.Select Temperatures for Select Y Result. d.Click Target Entity icon. e.Select Nodes for Target Entity. f.See figure to select Node 49:54 for Select Nodes. g.Click Apply. c a b f g d e

WS8-21 NAS104, Workshop 8, March 2004 Copyright 2004 MSC.Software Corporation Step 10: Quit MSC.Patran Quit MSC.Patran a.Select File on the Menu Bar and select Quit from the drop down menu a

WS8-22 NAS104, Workshop 8, March 2004 Copyright 2004 MSC.Software Corporation