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order of nodes in nodal_time_history of rst.Result

See original GitHub issue

Hello Alex,

i encountered a strange behavior when reading data from an RST file, that i believe might be a bug. Here’s my description: Within a larger project i use code like the following to read nodal data from an rst file via pyansys:

import pyansys
rstData = pyansys.read_binary('Panel.rst')
# method-A
nodeIDsA, nodalDisplA = rstData.nodal_displacement(rstData.nsets-1)

# method-B
nodeIDsB, nodalDisplBAll = rstData.nodal_time_history(solution_type='NSL')
nodalDisplB = nodalDisplBAll[rstData.nsets-1]

The order of the data in nodalDisplA is then differing from that in nodalDisplB, the node numbers in nodeIDsA and nodeIDsB however are identical. I sorted out a way to rearrange the data retrieved by the method nodal_time_history via a lookup table. By that i could verify that the data is indeed identical, except for the ordering. However i would expect the data to be an exact copy, or to be consistent to the nodal numbers returned by either function (method-A / method-B). I tried to fiddle out the way the data is read in the corresponding binary reader functions, but had no success.

This popped up when i tried to use the method nodal_time_history to read velocity and acceleration data which are ordered in the same manner the displacement data is. If this might be a problem specifically related to my testcase-data, i could provide any files needed for investigation.

Some version info: pyansys: 0.44.2 python: 3.7.7 Ansys: 19.3 (transient structural)

By the way, I highly appreciate your excellent work on this project and especially publishing it licensed open-source. In the moment i use it as a basis for Ansys data-IO in a flow-structure-interaction simulation framework. Best regards, Sebastian