FEMZIP is a specialised tool for the compression of LS-DYNA results developed by The Fraunhofer Institute for Algorithms and Scientific Computing. It reads in the plot state files (d3plot, *.ptf) then reconstructs them to produce a compressed (zipped) version of the results that can be up to ten times smaller.


FEMZIP reduces

  • size of archives
  • data transfer times
  • data loading times into post processors

The high compression rates of FEMZIP means storage and backup resources can be reduced and results files can be quickly and easy transferred across networks.

Post Processing Results

Oasys D3PLOT directly reads this compressed results file reducing the time taken to read in and animate a full car model by up to 60% depending on network speeds.

Functionality and Settings

FEMZIP compresses the results data by reducing the number of significant figures used to store data. Typically LS-DYNA uses 7 significant figures; a much higher level of accuracy than is required by the user.

The number of significant figures FEMZIP reduces the data by can be controlled by the user through a parameters file which specifies the required accuracy for each data type (velocity, stress, etc).


The decompression tool (FEMUNZIP) is also available free of charge allowing compressed files to be sent to and accessed by everyone, not just FEMZIP customers.



Comparison of basic LS-DYNA results and FEMZIP compressed results

Data reduction using FEMZIP on a typical full vehicle crash analysis


Oasys D3PLOT opening time for a full vehicle analysis