PDEtoolbox_Error using daeic3 (line 230) Need a better guess y0 for consistent initial conditions.

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Hello,
I am trying to solve a system with three partial differential equations coupled by using PDE toolbox.
As I simulate my code, I keep getting an error, saying
Error using daeic3 (line 230)
Need a better guess y0 for consistent initial conditions.
I cannot figure out where the error comes from. Can anyone help me to figure out what the problem is?
Attached PDF file is equations and corresponding code that I am trying to solve.
Any help would be very much appreciated.
Also, let me know if I could provide more information regarding this.

Accepted Answer

Ravi Kumar
Ravi Kumar on 5 Mar 2020
You do have a singula mass matrix becuase of the equation 2. If I understand correctly equation 1 can be solved in isolation. Once you have u1, can you attempt to solve equation 2 and 3 using u1? This may or may not resolve the issue, it will simplify the system a bit.
  3 Comments
Minjun Bae
Minjun Bae on 6 Mar 2020
Hello,
Please see the attached pdf file. I have included two function handles as well as my main code.
Thank you so much!
Best regards,

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