Specify default number of retained iterators in Casadi solver; reorder changelog

Author: jsbrittain

CHANGELOG.md

@@ -2,21 +2,21 @@
 
 ## Features
 
+- Added option to limit the number of integrators stored in CasadiSolver, which is particularly relevant when running simulations back-to-back [#2823](https://github.com/pybamm-team/PyBaMM/pull/2823)
 - Added new variables, related to electrode balance, for the `ElectrodeSOH` model ([#2807](https://github.com/pybamm-team/PyBaMM/pull/2807))
+- Added method to calculate maximum theoretical energy. ([#2777](https://github.com/pybamm-team/PyBaMM/pull/2777)) and add to summary variables ([#2781](https://github.com/pybamm-team/PyBaMM/pull/2781))
 - Renamed "Terminal voltage [V]" to just "Voltage [V]". "Terminal voltage [V]" can still be used and will return the same value as "Voltage [V]". ([#2740](https://github.com/pybamm-team/PyBaMM/pull/2740))
 - Added "Negative electrode surface potential difference at separator interface [V]", which is the value of the surface potential difference (`phi_s - phi_e`) at the anode/separator interface, commonly controlled in fast-charging algorithms to avoid plating. Also added "Positive electrode surface potential difference at separator interface [V]". ([#2740](https://github.com/pybamm-team/PyBaMM/pull/2740))
 - Added "Open-circuit voltage [V]", which is the open-circuit voltage as calculated from the bulk particle concentrations. The old variable "Measured open circuit voltage [V]", which referred to the open-circuit potential as calculated from the surface particle concentrations, has been renamed to "Surface open-circuit voltage [V]". ([#2740](https://github.com/pybamm-team/PyBaMM/pull/2740))
 - Added an example for `plot_voltage_components`, explaining what the different voltage components are. ([#2740](https://github.com/pybamm-team/PyBaMM/pull/2740))
-- Added method to calculate maximum theoretical energy. ([#2777](https://github.com/pybamm-team/PyBaMM/pull/2777)) and add to summary variables ([#2781](https://github.com/pybamm-team/PyBaMM/pull/2781))
-- Added option to limit the number of integrators stored in CasadiSolver, which is particularly relevant when running simulations back-to-back [#2823](https://github.com/pybamm-team/PyBaMM/pull/2823)
 
 ## Bug fixes
 
+- Fixed excessive RAM consumption when running multiple simulations ([#2823](https://github.com/pybamm-team/PyBaMM/pull/2823))
 - Fixed a bug where variable bounds could not contain `InputParameters` ([#2795](https://github.com/pybamm-team/PyBaMM/pull/2795))
 - Improved `model.latexify()` to have a cleaner and more readable output ([#2764](https://github.com/pybamm-team/PyBaMM/pull/2764))
 - Fixed electrolyte conservation in the case of concentration-dependent transference number ([#2758](https://github.com/pybamm-team/PyBaMM/pull/2758))
 - Fixed `plot_voltage_components` so that the sum of overpotentials is now equal to the voltage ([#2740](https://github.com/pybamm-team/PyBaMM/pull/2740))
-- Fixed excessive RAM consumption when running multiple simulations ([#2823](https://github.com/pybamm-team/PyBaMM/pull/2823))
 
 ## Optimizations
 

pybamm/solvers/casadi_solver.py

@@ -71,7 +71,7 @@ class CasadiSolver(pybamm.BaseSolver):
     integrators_maxcount : int, optional
         The maximum number of integrators that the solver will retain before
         ejecting past integrators using an LRU methodology. A value of 0 or
-        None (default) leaves the number of integrators unbound.
+        None leaves the number of integrators unbound. Default is 100.
     """
 
     def __init__(
@@ -88,7 +88,7 @@ def __init__(
         extra_options_call=None,
         return_solution_if_failed_early=False,
         perturb_algebraic_initial_conditions=None,
-        integrators_maxcount=None,
+        integrators_maxcount=100,
     ):
         super().__init__(
             "problem dependent",