Script for Ansys LS-Dyna / Mechanical

Louis

Ansys LS-Dyna / Mechanical 2023R1

How could I use script and/or ACT to

• Generate CFL time-step in Ansys LS-Dyna
• Get its Minimum CFL value and Maximum CFL value

Aria

Some calls seem to be asynchronous. For instance, when scoping the bodies to the CFL object, it appears to still be under-defined. For this reason I create a dummy comment object and delete it which will update the comment object.

the import() method initiates the cfl generation but this too seem to have issues, which is why i activate the model object and then the cfl object again. 

for larger models i would maybe try putting in a time.sleep(x) after the x.Import() 

msscl = ExtAPI.DataModel.CreateObject("TimeStepCalc",'LSDYNA')
allbodies = Model.Geometry.GetChildren[Ansys.ACT.Automation.Mechanical.Body](True)

bodies = [x.GetGeoBody().Id for x in allbodies if x.Suppressed == False]

sel = ExtAPI.SelectionManager.CreateSelectionInfo(SelectionTypeEnum.GeometryEntities)
sel.Ids = bodies
msscl.Properties['Geometry/DefineBy/Geo'].Value = sel
temp = Model.AddComment()
temp.Delete()



msscl.Import()
Model.Activate()
msscl.Activate()


print msscl.Properties['Minimum CFL value'].Value.ToString()
print msscl.Properties['Maximum CFL value'].Value.ToString()

Louis

Aria,

It works. Thank you very much!

This challenge has bothered me for a long time. Finally got this fixed.

Louis

One further question -

if this CFL Time Step object has been already created. How to get it and activate this existing CFL object?

I tried to get this object by ExtAPI.DataModel......as below, but got error.

ExtAPI.DataModel.Project.Children[0].Children[9].Import()

'DataModelObject' object has no attribute 'Import'

Louis

@Aria , could you help on the follow-up question....thank you.

Aria

@Louis The CFL timestep is a custom object, it has to be retrieved like this:

userObjs = ExtAPI.DataModel.GetUserObjects("LSDYNA")
myTimeStepObj = [obj for obj in userObjs if obj.Name == "TimeStepCalc"]
if len(myTimeStepObj)>0:
    myTimeStepObj=myTimeStepObj[0]

Louis

Aria,

This could be closed.

Thanks a lot for the answering.