Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.
Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Step function. Spherical 1D Cell Model
Posted 15.10.2011, 13:10 GMT-4 Version 3.5a 1 Reply
Please login with a confirmed email address before reporting spam
Hi everyone...
I'm modeling a spherical cell with time dependent varying conditions. I want to vary the concentration of the boundary condition using the heaviside function (flc1hs or flc2hs) to simulate a voltage pulse. When i solve the model i get the error message: "Last time step is not converged". The error ocurrs at the time step at which the step function changes its value (from 0 to some value). I've also tried to define a function from a file that contains the step data (same problem when tried to solve the model).
When i set a constant concentration at the boundary condition, the model solves without a problem. So the convergence problem is related to the step function...
What can i do to solve this???
Please help me...
I'm modeling a spherical cell with time dependent varying conditions. I want to vary the concentration of the boundary condition using the heaviside function (flc1hs or flc2hs) to simulate a voltage pulse. When i solve the model i get the error message: "Last time step is not converged". The error ocurrs at the time step at which the step function changes its value (from 0 to some value). I've also tried to define a function from a file that contains the step data (same problem when tried to solve the model).
When i set a constant concentration at the boundary condition, the model solves without a problem. So the convergence problem is related to the step function...
What can i do to solve this???
Please help me...
1 Reply Last Post 17.10.2011, 06:04 GMT-4
Please login with a confirmed email address before reporting spam
Posted:
1 decade ago
I have used step function in a similar way (potential steps) without any problems. What are your equations, i.e. physics?