changing parameters

[sandeepmam]

I am totally a beginner at python. I am trying to change the parameters set which are there in the youtube tutorial, but I am getting errors. where I am doing wrong?

import pybamm
pybamm.Simulation()

Changing parameter sets
model = pybamm.lithium_ion.SPMe()
chemistry = pybamm.parameter_sets.NCA_Kim2011
parameter_values = pybamm.ParameterValues(chemistry=chemistry)
sim = pybamm.Simulation(model,parameter_values=parameter_values)
sim.solve()

---

SolverError Traceback (most recent call last)
in
----> 1 sim.solve()

~\anaconda3\lib\site-packages\pybamm\simulation.py in solve(self, t_eval, solver, check_model, save_at_cycles, starting_solution, **kwargs)
593 if self.operating_mode == "without experiment":
594 if t_eval is None:
--> 595 raise pybamm.SolverError(
596 "'t_eval' must be provided if not using an experiment or "
597 "simulating a drive cycle. 't_eval' can be provided as an "

SolverError: 't_eval' must be provided if not using an experiment or simulating a drive cycle. 't_eval' can be provided as an array of times at which to return the solution, or as a list [t0, tf] where t0 is the initial time and tf is the final time. For a constant current (dis)charge the suggested 't_eval' is [0, 3700/C] where C is the C-rate. For example, run

sim.solve([0, 3700])

for a 1C discharge.

change parameter set.txt

[Saransh-cpp]

SolverError: 't_eval' must be provided if not using an experiment or simulating a drive cycle. 't_eval' can be provided as an array of times at which to return the solution, or as a list [t0, tf] where t0 is the initial time and tf is the final time. For a constant current (dis)charge the suggested 't_eval' is [0, 3700/C] where C is the C-rate. For example, run

The solve method requires t_eval with a suggested value of [0, 3700/C] where C is the C-rate.

Replace

sim.solve()

with

sim.solve([0, 3700])
# or
sim.solve(t_eval=[0, 3700])

[sandeepmam]

Hi, thanks for the reply.
I have tried but still, I am getting this kind of error.

change parameter set.txt

---

SolverError Traceback (most recent call last)
in
----> 1 sim.solve([0,3700])

~\anaconda3\lib\site-packages\pybamm\simulation.py in solve(self, t_eval, solver, check_model, save_at_cycles, starting_solution, **kwargs)
649 )
650
--> 651 self._solution = solver.solve(self.built_model, t_eval, **kwargs)
652
653 elif self.operating_mode == "with experiment":

~\anaconda3\lib\site-packages\pybamm\solvers\base_solver.py in solve(self, model, t_eval, external_variables, inputs, initial_conditions, nproc)
730 ninputs = len(ext_and_inputs_list)
731 if ninputs == 1:
--> 732 new_solution = self._integrate(
733 model,
734 t_eval_dimensionless[start_index:end_index],

~\anaconda3\lib\site-packages\pybamm\solvers\casadi_solver.py in _integrate(self, model, t_eval, inputs_dict)
262 extrap_event_names.append(event.name[12:])
263
--> 264 raise pybamm.SolverError(
265 "CasADI solver failed because the following "
266 "interpolation bounds were exceeded: {}. You may need "

SolverError: CasADI solver failed because the following interpolation bounds were exceeded: ['nca_ocp_Kim2011_data upper bound']. You may need to provide additional interpolation points outside these bounds.

[valentinsulzer]

What did you run? This works on develop

import pybamm

model = pybamm.lithium_ion.SPMe()
chemistry = pybamm.parameter_sets.NCA_Kim2011
parameter_values = pybamm.ParameterValues(chemistry=chemistry)
sim = pybamm.Simulation(model, parameter_values=parameter_values)
sim.solve([0, 3600])
sim.plot()

[sandeepmam]

I have run this...I would like to get the terminal voltage.

import pybamm

model = pybamm.lithium_ion.SPMe()
chemistry = pybamm.parameter_sets.NCA_Kim2011
parameter_values = pybamm.ParameterValues(chemistry=chemistry)
sim = pybamm.Simulation(model, parameter_values=parameter_values)
sim.solve()
sim.plot(["Terminal voltage[V]"])

[valentinsulzer]

Can you update your installation? pip install git+https://github.com/pybamm-team/pybamm.git@develop

[sandeepmam]

Thank you, I got it.