Use Param, Post,-1 Permalink Submitted by vijay.koumar on Sat, 2008-12-06 19:44. In nastran using PARAM, POST card you can control the output format of results file as XDB or OP2. Parameter Specification Description: Specifies values for parameters to be used at certain places in the control sequence. Format: PARAM, n, v Example: PARAM, K6ROT, 1.+3 Option Definition Type Default n Parameters name (one to 16 alphanumeric characters, the first of which is alphabetic). Character Required v Parameter value based on parameter typenasread reads bulk data deck (NASTRAN input), direct reading of model and result information in OUTPUT2 and OUTPUT4 files generated using NASTRAN PARAM,POST,-i cards. This is the most efficient and accurate method to import NASTRAN results for post-processing (visualization with feplot , normal model handling with nor2ss , ...) or parameterized ...