Oasys LS-DYNA Environment 8.1 VOLUME 3 ... - Oasys Software

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Oasys LS-DYNA Environment: User Guide (Version 8.1) analysis_ralph_1.thf analysis_ralph_1.thf01 analysis_ralph_1.thf02 analysis_ralph_1.thf03 analysis_ralph_1.xtf analysis_ralph_1.ctf analysis_ralph_1.ctf01 The number of family members depends upon the frequency at which the data is written and the amount of data written for each state. A new family member is started when either the current member becomes full or a dump file is written. Output Files - ASCII The ASCII files produced by LS-DYNA are as follows. The general print out file that echoes the input data and gives the status of the job is given the name root_name.otf for the initial file and root_name.otfnn on a restart, where nn is the restart number. A file called messag is also produced which summarises any error or warnings found during data input and initialization. A second summary file containing the same information as the messag file plus a summary of the cycle information as the analysis progresses is also produced called root_name.log and root_name.lognn on a restart. There are also several ASCII time history files that can be written by the code if requested. These files have the following names: secforc - cross section forces rwforc - rigid wall forces nodout - nodal point data elout - element data glstat - global data deforc - discrete elements matsum - material energies ncforc - nodal interface forces rcforc - resultant interface forces defgeo - smug animator database nasbdf - nastran BDF file spcforc - SPC reaction forces swforc - nodal constraint resultants abstat - airbag statistics avsflt - ASCII database nodfor - nodal force group bndout - boundary conditions rbdout - rigid body data gceout - contact energies sleout - interface energies Page 3.2
Oasys LS-DYNA Environment: User Guide (Version 8.1) Dump files sbtout - seatbelts jntforc - joint forces tprint - thermal analysis output LS-DYNA produces two types of binary dump file that allow analysis to be restarted. The first of these is the permanent dump file and a new file is written for each dump. The file name is root_name.dpfnn where nn is the dump number. The second type is the auxiliary dump file and for this dump the same file is continuously overwritten. The name of the auxiliary dump file is root_name.adf. Thus for the example analysis given above the following files could be created. analysis_ralph_1.dpf01 analysis_ralph_1.dpf02 analysis_ralph_1.adf On a restart the OASYS_71 shell will rename the chosen dump file to analysis_ralph_1.rtf. RESTARTING What is Restarting? Restarting means performing an analysis which continues from a previous analysis. The restart can begin from the end of the previous analysis or from part-way through it. It is possible to change some of the parameters of the model during a restart. Reasons for doing a restart include: ! The previous analysis was killed, or exceeded the user-defined CPU limit; the restart then completes the analysis. ! The previous analysis went wrong; to diagnose the error the analysis is restarted from a time before the onset of the error, but with more frequent outputs to the results files to allow viewing of the development of the error. ! The previous analysis had some troublesome elements. These can be deleted when restarting. ! A parameter had been wrongly set in the input file but started to have a significant effect only after large amounts of CPU had been used. Restarting offers the chance to correct the parameter without going back to the beginning. Page 3.3
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Oasys LS-DYNA Environment 8.1 VOLUME 3 ... - Oasys Software

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