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How to export mass and stiffness matrices of a large model?

JohLut
Hi,
 
up to now, I've applied the command EXTSEOUT (STIFFNESS MASS ASMBULK EXTID = 10 DMIGPCH) to get the matrices as a byproduct of the superelement reduction process.
This is ok for models of moderate size.
 
However, this approach seems not reasonable for rather large models (~1.000.000 nodes) as the intermediate files like *.DBALL are blown up to more than 16 GB and the computations take ages.
 
Since I'm not interested in the external superelement itself I'm wondering if there might be a simpler way to export the system matrices without extensive reduction computations.
 
Best regards,
Johannes
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  • 0
    Works fine so far!
    Unfortunately the *.pch file still exceeds 11GB as it's written in ASCII.
    The *.op4 is binary but unfortunately all of the matrix entries (including also all zero entries) are written to the file leading to large file sizes, too.
    Is it somehow possible to simply write the matrix information to a custom binary file in the following sparse format?
     
    row index, column index, non-zero value
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  • 0
    Works fine so far!
    Unfortunately the *.pch file still exceeds 11GB as it's written in ASCII.
    The *.op4 is binary but unfortunately all of the matrix entries (including also all zero entries) are written to the file leading to large file sizes, too.
    Is it somehow possible to simply write the matrix information to a custom binary file in the following sparse format?
     
    row index, column index, non-zero value
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