I have recently implemented the provided COMSOL 3.5a example of a lithium ion battery in version 4.0. The problem, as stated, solves just fine in 3.5a with easy adjustment of the applied current, and thus discharge/charge rates of the cell. I have modified the model slightly by removing the 2D diffusion geometry so the model is now purely 1D.
When I try to solve the model in 4.0, I get the "Cannot find consistent initial values" error, but all the initial values are identical to those in 3.5a. I have struggled with this for a while now, and I am getting frustrated not being able to find the solution.
If anybody can provide any direction I would greatly appreciate it. I also have noticed that I do not have the same options for the selected solver in 4.0 that I had in 3.5a. In 3.5a, the solver is Direct (UMFPACK), but in 4.0 the default is MUMPS. I am not an expert in these solvers so I may be using the wrong one, but I'm not sure where the initial condition problem arises.
Please see the attached file for COMSOL 4.0.
Let me know if more clarification is needed - thanks in advance.
Mark
When I try to solve the model in 4.0, I get the "Cannot find consistent initial values" error, but all the initial values are identical to those in 3.5a. I have struggled with this for a while now, and I am getting frustrated not being able to find the solution.
If anybody can provide any direction I would greatly appreciate it. I also have noticed that I do not have the same options for the selected solver in 4.0 that I had in 3.5a. In 3.5a, the solver is Direct (UMFPACK), but in 4.0 the default is MUMPS. I am not an expert in these solvers so I may be using the wrong one, but I'm not sure where the initial condition problem arises.
Please see the attached file for COMSOL 4.0.
Let me know if more clarification is needed - thanks in advance.
Mark
