Read out of already defined keywords

[JanKirner]

Hello everybody,

As part of the preparation process of solver input files (.k-file) for LS-Dyna, I would like to use PyDyna to read out and modify existing solver input files. Some conspicuousness and questions have arisen. The import as a DynaSolution object works without any problems using the open_files method.

In a minimal example for a solver input file, *PART_SOLID keywords have been defined among others, which means that also the keyword *NODES exists. The model attribute oft the DynaSolution object is updated using the _sync_up_model method. The _parts attribute of the model object is described with values, but the _solids and _nodes attributes are not. What is the reason for this behaviour?

As far as I can see from the minimal example, keywords already defined in the solver input file such as *DEFINE_COORDINATE_SYSTEM, *DEFINE_CURVE or *SET_NODE_LIST cannot be read and processed using PyDyna. However, it is possible to define those keywords using suitable classes or methods such as the method create_general_keyword. Is there a way to read and process existing keywords from a solver input file? From my point of view, this is an essential function.

Thank you in advance.

[RobPasMue]

Pinging @ansys/pydyna for visibility

[koubaa]

@ebzschulth you can just use keyword.mid=2

[ebzschulth]

Thanks for your quick response, it works!

[ebzschulth]

Hi @koubaa, is there also a way to change the parameters in a *.dyn file? I was trying to read it the same way:

# Open deck
deck = Deck()
deck.import_file(sim_dyn_file_path)
    
# Change keyword value
for keyword in deck.keywords:
           keyword.__setattr__(variable_name, float(new_value)
           
           
which doesnt work unfortunately.

Thanks

[koubaa]

@ebzschulth pydyna doesn't look at the file extension, as long as the .dyn file follows the same keyword file spec, it should load it in the same way. Please share a minimal example reproducing the problem if you would like us to look into it

[ebzschulth]

I get the exception: Exception: Only comments can precede *KEYWORD

Here is a minimal example, where I am trying to change the parameter U to 0.24:
change_process_params.zip

The file path in change_process_params_minimal_example has to be changed to the file sim.dyn.