Problem with Callbacks

FLAC3D
1

Hi there,
I’m trying to make a Barton Bandis class in Python, however I can’t compile my code, it always gives me this error:

flac3d>model callback add update_friction_fault python
*** Python error: 'Unused extra parameter 2 (callback) found on command line.\n    While processing line 0 of source Python interpreter.'

The problematic part of the code is here:

    def __init__(
        self,
        interface_name: str,
        JRC: float = 10.0,
        JCS: float = 75000000.0,
        phi_r: float = 15.0,
        cycles_frequency: int = 50,
        friction_max: float = 30.0,
        tension_friction: float = 20.0
    ):
        self.interface_name = interface_name
        self.JRC = JRC
        self.JCS = JCS
        self.phi_r = phi_r
        self.cycles_frequency = cycles_frequency
        self.friction_max = friction_max
        self.tension_friction = tension_friction

        
        it.command(f"model callback add update_friction_{interface_name} python")
       
        it.command(f"model callback modify update_friction_{interface_name} cycle {cycles_frequency}")
        
        it.f2py_function_register(f"update_friction_{interface_name}", self.update_friction)

        it.print_(f"[BartonBandis] Initialized for interface {interface_name}")
        it.print_(f"   JRC={JRC}, JCS={JCS}, phi_r={phi_r}°, freq={cycles_frequency} cycles")

How do I fix this? I’ve tried many things with no success. By the way, I’m using FLAC3D v9.0

Thanks in advance,

Felipe

2

Hello!

I’m not sure if the command "model callback works… i’ve always used fish callback********

1 Like
3

I think I’m very close to make this Class Barton Bandis work.

The problem is precisely here I think:

    def __init__(self, interface_name: str, JRC: float = 10.0, 
                 JCS: float = 75e6, phi_r: float = 15.0,
                 friction_max: float = 30.0, tension_friction: float = 20.0,
                 update_freq: int = 50):
        # Find interface
        self.interface = None
        for contact in it.contact.list():
            if contact.name() == interface_name:
                self.interface = contact
                break

        if not self.interface:
            raise ValueError(f"Interface '{interface_name}' not found")

        self.interface_name = interface_name
        self.JRC = JRC
        self.JCS = JCS
        self.phi_r = phi_r
        self.friction_max = friction_max
        self.tension_friction = tension_friction
        self.update_freq = update_freq

        self._register_callback()
        BartonBandis._instances[interface_name] = self
        
        print(f"\nInitialized BartonBandis for '{interface_name}'")

    def _register_callback(self):
        """FLAC3D callback registration using a module-level function"""
        callback_name = f"bb_update_{self.interface_name}"
        # Create a callback function with the interface name bound using functools.partial
        callback_func = partial(bb_update_callback, interface_name=self.interface_name)
        it.model().callback.add(callback_func, type='mechanical', name=callback_name)
        it.model().callback.modify(callback_name, cycle=1)

When I invoke the class in my model:

model restore 'insitu.f3sav'
python import Barton_Bandis as bb
python bb.BartonBandis.clear_instances()
python bb.setup_barton_bandis_interfaces(fault_names=['fault', 'fault_chamber1', 'fault_chamber2', 'fault_chamber3', 'fault_corridor', 'fault_g1', 'fault_g2', 'fault_g3', 'fault_chamber_small'])

I get these errors in the Python console:

Success: Cleared all BartonBandis instances
Error: function takes exactly 2 arguments (1 given)
Error: function takes exactly 2 arguments (1 given)
Error: function takes exactly 2 arguments (1 given)
Error: function takes exactly 2 arguments (1 given)
Error: function takes exactly 2 arguments (1 given)
Error: function takes exactly 2 arguments (1 given)
Error: function takes exactly 2 arguments (1 given)
Error: function takes exactly 2 arguments (1 given)
Error: function takes exactly 2 arguments (1 given)

Configured 9 Barton-Bandis interfaces

Thanks!

4

Hi,

Maybe you already solved your problem.

From what I am gathering from your code you are never instantiating your class so you get an error on the number of arguments because the “self” argument does not exist yet.
In this case python calls a function of a class rather than a function of a class instance which is allowed and often done in python but gives you this type of errors.

I might be wrong, It is hard to figure out the error, as you do not provide enough information your code.

5

Hi,
Thanks for your feedback.

No, I haven’t fixed it yet. I ended up doing it with FISH successfully, but I’ll come back to this eventually. I tried many things and the error persisted.

I’ll come back to this topic to give the solution. Someday.