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[FAQ]

There are two main options here: Create the derivative yourself in Python, or call out to APDL to invoke the DERIV command.

If creating the derivative yourself, it will require some numerical programming as (unfortunately) ACT’s Python does not have access to SciPy. If calling APDL, note that ansys.RunANSYS() might not won’t work in an Evaluate or Generate callback due to a threading issue. It probably will, but if not, here is how to do it without “import ansys” capabilities:

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import Ansys.Utilities
from Ansys.Utilities import ApplicationConfiguration

import System
from System.Diagnostics import Process
from System.Diagnostics import ProcessStartInfo
from System.Diagnostics import ProcessWindowStyle

# Create a tmp bat file in this path
bat_file = System.IO.Path.Combine(apdlDir,’tmp.bat’);
info = System.IO.StreamWriter(bat_file)
a = ApplicationConfiguration.DefaultConfiguration.AwpRootEnvironmentVariableValue
b = System.IO.Path.Combine(a,’ansys’)
c = System.IO.Path.Combine(b,’bin’)
d = System.IO.Path.Combine(c,ApplicationConfiguration.DefaultConfiguration.AnsysPlatform)
e = System.IO.Path.Combine(d,’ansys162.exe’)
commandLine = ‘”‘+e+'” -dir “‘+apdlDir+'” -j “file” -b -i “‘+apdlInput+'” -o “‘+apdlOutput+'”‘
info.WriteLine(commandLine)
info.Close()

# Run the bat file now
startInfo = ProcessStartInfo(bat_file, None)
startInfo.WindowStyle = ProcessWindowStyle.Minimized

p = Process.Start(startInfo)
p.WaitForExit()

# Delete the tmp bat file
System.IO.File.Delete(bat_file)
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In this code, we create a tmp file with the command we want, and execute it with ANSYS. A nice way to get any APDL functionality in your ACT code.