# Questions tagged [stiffness]

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### NDSolve::ndcf: Repeated convergence test failure; unable to continue

I have been trying to solve this system of differential equations: ...
1 vote
107 views

### NDSolve producing oscillatory results

NDSolve producing very oscillatory solutions even after not having any large numbers or warning/errors ...
55 views

### NDSolve returns stiff problem and forces extrapolation which gives unreasonable result

I am trying to solve a first order ODE using ParametricNDSolve for getting particle trajectory in a flow around an obstacle. I got an error message that "At t == 221.96028149270003`, step size is ...
• 31
71 views

### Stiffness or singularity in NDSolve for a system of equations with switchpoint

I am trying to solve the following set of equations: ...
• 73
1 vote
52 views

### Stiffness problem which abruptly stops the evaluation

We have a Lagrangian and we found the EOM. We need to solve the EOM and find the Phase-space plot. However, we are facing a stiffness problem which abruptly stops the evaluation (...
• 2,456
1 vote
97 views

### NDSolve stiff system of ODEs

I am having a hard time trying to solve the following system of ODEs X'' = e^{2X} + e^{2Y} Y'' = e^{2Y} - 3 e^{2X} with initial conditions that mimic a linear ...
• 13
60 views

### Explicit modified midpoint (Gragg smoothing)

In the "StifnessSwitching" method the default numerical scheme for the non-stiff solver is Explicit modified midpoint (Gragg smoothing) with a decreasing step size. I decided to study the ...
• 13
116 views

### FEM breaks because of Abs(f'(x))

I am trying to solve a 1d differential equation in Mathematica using the finite element method. I have successfully implemented the problem in a commercial software called COMSOL, but I like to use ...
• 71