Monday, September 8, 2008

XDB vs OP2

XDB: Written using entry: PARAM,POST,0; Results are accessed through Direct Results Access (DRA) working directly with MSC Nastran results database
  1. XDB files are compatible primarily with PATRAN and other MSC Software
  2. Time to read the XDB results into the PATRAN database is eliminated (accessed directly from Nastran result database)
  3. Since the .XDB data is not duplicated in the PATRAN database, the size of the PATRAN database is greatly reduced.
  4. Multiple XDB files can be accessed from a single PATRAN database and can be well managed, since the subcases of each XDB can be easily distinguished from one another
  5. XDB file size limit can go up to 8-10GB (I have attached upto 40 GB)
  6. XDB files can only be accessed when they are located on the same machine that PATRAN is running
  7. Deleting a single Result Case from an attached .XDB file results in deleting all associated data with that attached .XDB file. i.e. deleting one Result Case deletes all Result Cases.

OP2:Written using entry: PARAM,POST,-1; Results are read in as data blocks permanently into Patran

  1. OP2 file is a universal Nastran result file which can be imported/ read into different post-processors
  2. Time to read the OP2 results into the PATRAN database is longer (datablocks are required to be read in)
  3. Since the .OP2 data is permanently attached to the PATRAN database, the overall size of the database increases considerably.
  4. Though multiple OP2 files can be attached to a single PATRAN database, the overall database size increases proportionally and it is confusing to identify the subcases that belong to a particular OP2 file
  5. OP2 file size is limited only up to 2GB (Check www.mscsoftware.com for updates)
  6. OP2 files has the flexibility by which it can be accessed from network drives or remote machine
  7. Individual Result Cases can be deleted in an OP2 file attachment.

5 comments:

Unknown said...

I work in the US and find your information you posted very useful. Keep up the good work! =P

Unknown said...

its very useful to me as beginner,i have a doubt 'how to print stiffness ,force,displacement&mass matrix in f06 file.

ஜெயங்கொண்டம் விஜய் G said...

Hello Vijesh Thanks for the wonder full aricle. I have a query, when I am running same Nastran input file, I got different episilon values. The values are remains same. what is the reason for this difference?

roja said...

Hi there,
iam doing a problem in pastran. After analysis it is showing that no result file exist that is .XDB file. I have checked my f06 file too, but there is no any USER FATAL MESSAGE. Can anyone please help me to understand what happend?
Thank you in advance.

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