Hello! I am simulating a DAE model as an ODEProblem using a constant mass matrix. A model parameter p changes from 0 to 1 at time t=t1 using DiscreteCallback. The solver returns dt<=dtmin at t=t1 when p changes. However, running the model with p=1 from the start works fine. Am I missing something…

The issue was due to reinitialization which has now been improved for DAEs.

DiffEq: Discrete callback causes dt<=dtmin

aaliqureshi October 13, 2023, 9:39pm 5

Closing this thread.

DAE mass matrix formulation fails but implicit formulation works

Topic		Replies	Views
DAE mass matrix formulation fails but implicit formulation works Modelling & Simulations question	19	656	April 7, 2024
Callback: Switch between dynamic models and time step depending on the region General Usage diffeq , differentiation	7	931	March 22, 2019
Problem about using DiscreteCallback function in solving ODE problem General Usage question , diffeq	4	848	June 17, 2020
When to use a discrete callback in DifferentialEquations.jl General Usage	2	1155	December 10, 2020
Differential Equation solve problem Modelling & Simulations question , diffeq	2	435	September 3, 2021