PAT312, Section 29, December 2006 S29-1 Copyright 2007 MSC.Software Corporation SECTION 29 THE ANALYSIS FORM. - презентация

1 PAT312, Section 29, December 2006 S29-1 Copyright 2007 MSC.Software Corporation SECTION 29 THE ANALYSIS FORM

2 PAT312, Section 29, December 2006 S29-2 Copyright 2007 MSC.Software Corporation

3 PAT312, Section 29, December 2006 S29-3 Copyright 2007 MSC.Software Corporation SETTING UP THE ANALYSIS l Select dimensionality (2D, 3D, Axisymmetric) l Request geometric unit conversion l Select materials database l Input solution type l Steady state l Transient l Combined steady state/transient l Define solution parameters l Define output parameters l Select tasks performed upon submission l Viewfactor computation l Translation to another code l Submit analysis directly from MSC.Patran

4 PAT312, Section 29, December 2006 S29-4 Copyright 2007 MSC.Software Corporation ANALYSIS TRANSLATION PARAMETERS l Declare the dimensionality of the model l 2D Planar (unit thickness) l 2D Axisymmetric l Define RZ axes from global coordinates l Global 3D (default) l Request a conversion of FEM geometric units for analysis l Define from/to units l Conversion affects only FEM geometric data l LBC data, heat transfer coefficients, Qs, etc. must be in units consistent with resulting conversion unit l Select database file from which to extract material property data l MSC.Thermal materials property database l User defined database l Revert to defaults

5 PAT312, Section 29, December 2006 S29-5 Copyright 2007 MSC.Software Corporation ANALYSIS SOLUTION TYPE l Select the type of analysis l Thermal l Hydraulic l Coupled Thermal/Hydraulic l Request the type of solution l Steady State l Transient l Combined sequential l Select viewfactor analysis l Solution type l Error options

6 PAT312, Section 29, December 2006 S29-6 Copyright 2007 MSC.Software Corporation ANALYSIS SOLUTION PARAMETERS l Calculation temperature scale l Consistent with fixed temperature BCs l Define independent parameters for l Thermal network l Select solver options l Define all solution parameters l Run control l Convergence l Iteration l Relaxion l Hydraulic Network l Define rate of solution coupling l Viewfactor solution l Integration parameters l Optimize execution time l Viewfactor file names

7 PAT312, Section 29, December 2006 S29-7 Copyright 2007 MSC.Software Corporation TIPS ON SOLVER SELECTION l Standard Solver l Modified Hughes Method l Robust multipurpose iterative solver l Optimized for large nonlinear models l Weakly nonlinear solver l Same robust multipurpose iterative solver l Selectable reduction of property updates l Increased execution speed l Direct Solver l Modified Choleskis Method l Optimized for small "stiff" models l Performance deteriorates with l Increasing problem size ( Nodes) l Nonlinearity l Note: Never use the direct solver if modeling phase change

8 PAT312, Section 29, December 2006 S29-8 Copyright 2007 MSC.Software Corporation SOLUTION PARAMETERS Convergence Parameters l Define temperature convergence criteria l Convergence based on total residual temperature error l Not iterative delta-T l Typically yields an order of magnitude lower iterative delta-T l Perturbation temperature used in evaluating derivatives for Newtons 1 st and 2 nd order method used by SNPSOR solver l 1.0 and greater for hot radiation problems (several thousand degrees K) l Smaller values for convection and mass flow dominated problems l Defaults settings typically yield high quality solutions

9 PAT312, Section 29, December 2006 S29-9 Copyright 2007 MSC.Software Corporation SOLUTION PARAMETERS Run Control Parameters l Modify model timing parameters l Select from catalog of Stefan- Boltzmann constants l Modify model temperature control parameters l Define global initial temperature and scale l Modify model temperature control parameters l Define restart data l Revert to defaults

10 PAT312, Section 29, December 2006 S29-10 Copyright 2007 MSC.Software Corporation SOLUTION PARAMETERS Viewfactor Run Control Parameters l Control accuracy of radiation resistor computations l Revert to defaults

11 PAT312, Section 29, December 2006 S29-11 Copyright 2007 MSC.Software Corporation SOLUTION PARAMETERS Viewfactor File Names l Change viewfactor file names l Generally should use defaults l Revert to defaults

12 PAT312, Section 29, December 2006 S29-12 Copyright 2007 MSC.Software Corporation SOLUTION PARAMETERS Steady State Iteration Parameters l The form will depend on analysis type selected l Steady State l Maximum SS iterations l Increase for l Non-linearities l Stiff problems l Convergence difficulties l Iterations between outputs l Creates nodal results files l Help identify convergence problem areas

13 PAT312, Section 29, December 2006 S29-13 Copyright 2007 MSC.Software Corporation SOLUTION PARAMETERS Transient Iteration Parameters l Transient iteration controls l Adaptive time stepping l Iteration limits l Delta-t adjustment factors l Select explicit/implicit solution l 1= Nodal adaptive l 0= fully explicit l -1= Fully implicit l -x= User defined (0

14 PAT312, Section 29, December 2006 S29-14 Copyright 2007 MSC.Software Corporation SOLUTION PARAMETERS Relaxation Parameters l Input relaxation parameters: l Globally l By heat transfer mode (default) l Node by node l Relaxation functions to speed convergence l Absolute value should be between 0.0 and 2.0 (non-inclusive) l Positive values invoke adaptive relaxation algorithm l Negative values fix the relaxation and increase the radius of convergence at the expense of convergence rate

15 PAT312, Section 29, December 2006 S29-15 Copyright 2007 MSC.Software Corporation ANALYSIS OUTPUT REQUESTS l Toggle input echo into qout.dat file l Select output temperature scale l Nodal Results file format l Default is temperature only l Select all 12 for more data l Select output print interval l Controls output frequency l Nodal results l Diagnostic output l Plot block unaffected l Output each converged time step l Post analysis Cs, Gs and Qs l SINDA input deck format

16 PAT312, Section 29, December 2006 S29-16 Copyright 2007 MSC.Software Corporation OUTPUT REQUESTS Print Interval Control l Transient analysis l Initial print interval l Staged intervals l Change to a new interval at the specified solution time

17 PAT312, Section 29, December 2006 S29-17 Copyright 2007 MSC.Software Corporation OUTPUT REQUESTS Nodal Results File Format l All nodal result quantities available for coupled thermal/hydraulic solution l Nodal results file format l ASCII l Binary (default)

18 PAT312, Section 29, December 2006 S29-18 Copyright 2007 MSC.Software Corporation OUTPUT REQUESTS Nodal Results File Format l Results template automatically written for selected quantities l Labels can be modified by user

19 PAT312, Section 29, December 2006 S29-19 Copyright 2007 MSC.Software Corporation OUTPUT REQUESTS Nodal Results File Format l Thermal solution results l Nodal results written to: l nrxxx.nrf.yy files l Nodal Temperature (default) l Select all 12 for additional data l Quantities useful for verification and diagnosis l Custom results template matches output requests Heat Flux values recently added l Necessary for new heat flux contour plot capability

20 PAT312, Section 29, December 2006 S29-20 Copyright 2007 MSC.Software Corporation OUTPUT REQUESTS Nodal Results File Format l Hydraulic solution results l Available when hydraulic or coupled solution is selected l Nodal quantities l Pressure l Net Mass Flow Rate l Elemental quantities l Written to qout.dat file l Mass Flow Rate l Differential Head l Fluid Velocity l Volumetric Flow Rate

21 PAT312, Section 29, December 2006 S29-21 Copyright 2007 MSC.Software Corporation OUTPUT REQUESTS Print Block Definition l Determines which nodal results are printed to the qout.dat file l Does not affect nodal results files l Default is to print all l Define groups of nodes by: l Initial node number l Final node number l Increment

22 PAT312, Section 29, December 2006 S29-22 Copyright 2007 MSC.Software Corporation OUTPUT REQUESTS Plot Block Definition l Determines which nodal results are printed to the qplot.dat file l Default is no qplot.dat created l Define groups of nodes by: l Initial node number l Final node number l Increment

23 PAT312, Section 29, December 2006 S29-23 Copyright 2007 MSC.Software Corporation OUTPUT REQUESTS Supplementary Diagnostic Output l Additional output quantities l The information can be quite extensive l E.g. Several lines of data related to each convection resistor calculation l Diagnostic data written to the qout.dat file in ASCII text

24 PAT312, Section 29, December 2006 S29-24 Copyright 2007 MSC.Software Corporation MSC.THERMAL SUBMIT OPTIONS l Specifies the job submittal files l If the physical model has not changed (geometry, FEM, materials) but boundary conditions have changed, click on Translate Boundary Conditions Only l After the Analysis Apply button is selected, MSC.Thermal will create a subdirectory with the user-supplied jobname l Runtime files written to jobname subdirectory l Select OK to affect Submit options l Revert to defaults using Defaults button

25 PAT312, Section 29, December 2006 S29-25 Copyright 2007 MSC.Software Corporation ANALYSIS READ RESULTS l Read in the results for the analysis l Navigate to the job subdirectory l Type in *.nrf* to filter for nodal results files (*.asc) for text results l Select Results file

26 PAT312, Section 29, December 2006 S29-26 Copyright 2007 MSC.Software Corporation ANALYSIS READ RESULTS l Optionally, select results template l After v2005r2, a customized template written to the job sub-directory and is automatically selected

27 PAT312, Section 29, December 2006 S29-27 Copyright 2007 MSC.Software Corporation RESULTS TEMPLATES l A results template formats the incoming nodal results l Provides proper field titles and load set names l Filters incoming data by column l Each filters for a specific set of columns l Starting in v2005r2 a custom template is written to the job subdirectory which matches the users output selections l Thermal templates l There are 5 templates for thermal results l e.g. pthermal_128_nodal.res_tmpl l There are 2 templates for hydraulic results l e.g. pthermal_12_pnodal.res_tmpl l General results templates l Used for other codes and neutral file results formats l Includes SINDA results template l sinda.res_tmpl

28 PAT312, Section 29, December 2006 S29-28 Copyright 2007 MSC.Software Corporation ANALYSIS template.dat.apnd FILE l The template.dat.apnd file is separate from the results template. l Contains templates which are… l Used to provide certain data for the analysis run l Template types are: l MID, MACRO, CONV, VFAC, etc. l Is a formatted text file l Can be created using Analysis, Build Template…

29 PAT312, Section 29, December 2006 S29-29 Copyright 2007 MSC.Software Corporation ANALYSIS BUILD TEMPLATE l Writes a properly formatted temlate.dat.apnd file l Including user comments l Prompts the user for required inputs l Access descriptions of convection configurations l Will write several templates to a template.dat.apnd file l Create or modify templates l Read an existing template or create a new one l Templates are created with sequential file numbers l Analysis uses highest version template.dat.apnd.xx file l Stored in the directory with the Patran Thermal db file

30 PAT312, Section 29, December 2006 S29-30 Copyright 2007 MSC.Software Corporation ANALYSIS BUILD TEMPLATE l Create, Modify, Read and Delete templates l When all templates are defined l Write File… template.dat.apnd

31 PAT312, Section 29, December 2006 S29-31 Copyright 2007 MSC.Software Corporation ANALYSIS BUILD TEMPLATE l View convection configuration information l Shows necessary inputs l GPIDs l MPIDs l Which are input via the CONV template

32 PAT312, Section 29, December 2006 S29-32 Copyright 2007 MSC.Software Corporation ANALYSIS DELETE l Deletes only the analysis job settings l Asociated job sub-directory and files are retained l Analysis settings can be returned to default by clicking, Default All Analysis Forms.

33 PAT312, Section 29, December 2006 S29-33 Copyright 2007 MSC.Software Corporation

34 PAT312, Section 29, December 2006 S29-34 Copyright 2007 MSC.Software Corporation

35 PAT312, Section 29, December 2006 S29-35 Copyright 2007 MSC.Software Corporation

36 PAT312, Section 29, December 2006 S29-36 Copyright 2007 MSC.Software Corporation