1. Gegen 2GB oder 4GB Grenze gelaufen ?
Das Betriebssystem muss natürlich die Filegröße können.
2. es gibt das 32bit-word-Limit bei XDB
Bei OP2 kann es ähnlich sein.
bei ausgabe zu xdb gibts es limits: aus der knowledge base:
Postprocessing - XDB Limitation - Maximum Number of Grids ab V68.03 für alle SOL 1 bis 200
There is a limit on the number of GRID points which can be processed by the DBC module for the ".xdb" file. The limit is dependent on many factors, one of the most significant factors is the solution sequence. For dynamic and nonlinear solution sequences the limit is 214748 GRID points. If more GRIDs than this exist in the model, some of the desired data may not be processed and placed in the ".xdb" file. Although there is still a limit on the total amount of data DBC can process, Version 70.5 contains changes that take into account the actual number of timestep or load steps actually solved. Thus, the program can more accurately predict the amount of data that it must process. The maximum number of grids is now determined dynamically and this change effectively greatly increases At 2005R2 this limitation is removed with DBCFACT=2.
mit dem Auszug aus 70.5:
Access to .XDB Database
The DBC modules convention for formulating access keys for the .XDB database
has been modified. This modification allows you to process more qualifiers for a
given number of grids or elements than previous versions. Qualifiers are output
time steps, number of frequencies, etc. In the previous versions, the maximum
number of qualifiers was 9,999. For example, you could not process a transient
analysis output with more than 9,999 time steps. This limit constraint was
hard-wired in the DBC modules. On the other hand, the maximum number of grids
or elements that could be processed was limited as the access key stored in a 32-bit
word. Access key is a function of number of grids and its qualifiers. From
Version 70.5 onwards, the number of grids and qualifiers you can process is
dynamic based on problem characteristics. For example, you can now process
larger numbers of grids with less than 9,999 qualifiers or you can process less
numbers of grids with more than 9,999 qualifiers. The access key is still limited to a
32-bit word.
For applications in the field that do not support the new dynamic convention, a
system cell is provided to specify the use of the old convention. This system cell
name is DBFACT and the number is 274.
A system cell value of one will cause the old convention to be used. This value may
be specified on the NASTRAN statement or in an RC file by following statement:
NASTRAN DBCFACT=1 or NASTRAN SYSTEM(274)=1
Also die Ergebnisse in mehr Teilrechnungen splitten oder auf aktuelles Nastran und 64bit umsteigen.
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