Learning Forum

[cardiac.scripter]

Hi, 

I'm having a problem with my units. They are not staying consistent.

I import my model as an .inp. The mesh is constructed in mm.

# Import the model

mimp=Model.GeometryImportGroup.AddModelImport()

mimp.ModelImportSourceFilePath=input_file

mimp.Import()

I set the units:

analysis = Model.AddStaticStructuralAnalysis()

analysis.AutomaticTimeStepping = AutomaticTimeStepping.On

analysis.InverseOption = True

analysis.LargeDeflection = True

ExtAPI.Application.ActiveUnitSystem = MechanicalUnitSystem.StandardNMMdat

But the mesh is imported as 5e4mm even though it should be in region 5e1mm.


When I load the sampe input file in the GUI I don't get this problem. 



When I load my pressure

in MPa

Pressure.Magnitude.Output.DiscreteValues = [Quantity("0 [Pa]"), Quantity("-1.0666e-002 [MPa]")]

However when I display the BCs 



It gives it in hbar.

Therefore, I'm getting very different results to when I run in the GUI with the same input file. 
Thanks in advance

[Erik Kostson]

 

 

 

Hi

 

For the geometrey units issue. We need to set the units of the imported cdb file. See here where I have added that in the end of my post.

https://discuss.ansys.com/discussion/4431/how-to-add-a-model-in-standalone-mechanical

 

As for the hbar pressure issue, that comes from using the StandardNMMdat – I would suggest to use NMM or NMMton

in ExtAPI.Application.ActiveUnitSystem = MechanicalUnitSystem.StandardNMMdat

and that will have MPa units.

 

To close of, I would suggest to post this type of questions (pymechanical and script type), in our dedicated script forum

here: https://discuss.ansys.com/

 

or if there is a bug/issue with pymech., then in github:

https://github.com/ansys/pymapdl/issues

All the best

Erik

PS: In the pressure load change unit to MPa from Pa see below marked:

Pressure.Magnitude.Output.DiscreteValues = [Quantity(“0 [Pa]“), Quantity(“-1.0666e-002 [MPa]”)]

 

 

[cardiac.scripter]

Hi Erik, 

That worked! Thanks for your help. 

Yes I've seen this forum. However, I cant find the button for posting a new discussion topic aha. 

Here is my home page:
And thsi is when I open structures:



Do I need to be approved before I can post? Or am I just being stupid and can't see the "Start New Discussion" button?

Thanks in advance.

[Erik Kostson]

Hi

What is your user name there and I can check why it has not been approved yet (like you say think it needs some approval)?

All the best

Erik

[Erik Kostson]

Hello

 

Many thanks - you should be ok now (you should have recieved an email about it also).

All the best

Erik

[cardiac.scripter]

Sorted!

[Erik Kostson]

 

perfect – anything else (script related) post there and we will try to help.