Hi guys,
Been trying to model the degradation of a simple cube using the General Form PDE (g) model. But kept running into this. Been cracking at it for hours, really frustrated, could anyone give me a hand.
- Feature: Time-Dependent Solver 1 (sol1/t1)
Failed to find consistent initial values.
Attempt to evaluate nonintegral power of negative number.
Function: ^
Failed to evaluate expression.
Expression: d((-(comp1.Rst-Ce0*(1-a*(comp1.Rs/Ce0)^b)*(k1+k2*(comp1.Col/m)^n))*test(comp1.Rs))*(dvol spatial),{test0})
Failed to evaluate Jacobian of expression.
Expression: (-(comp1.Rst-Ce0*(1-a*(comp1.Rs/Ce0)^b)*(k1+k2*(comp1.Col/m)^n))*test(comp1.Rs))*(dvol spatial)
Last time step is not converged.
Beginner on the software, please do let me know if you need more info.
Thanks in advance.
Linfeng
Have a look at https://www.researchgate.net/post/How_do_you_fix_the_Failed_to_find_consistent_initial_values_error_in_COMSOL
These links might help ..
https://uk.comsol.com/forum/thread/25297/failed-to-find-consistent-initial-values
https://www.researchgate.net/post/How_do_you_fix_the_Failed_to_find_consistent_initial_values_error_in_COMSOL
https://www.researchgate.net/post/Whats_does_the_following_error_mean_in_COMSOL_Failed_to_find_consistent_initial_values
https://www.comsol.jp/forum/thread/197/failed-to-find-consistent-initial-values
Hi Linfeng,
See whenever you get an error stating inconsistent initial values, It means the initial conditions provided by you at the different domains or components are either contradicting each other or are not feasible for the governing equations of that physics to solve. Please re-check your inputs, suitability of physics, and meshing. Secondly, In your case, it says to be " Attempt to evaluate nonintegral power of negative number." which means there is a probability that you might have entered inputs in negative or else at initial stages itself it leads to nonintegral power of negative number. Thirdly, ' Failed to evaluate the expression.' indicates that, either you have not clearly defined all the variables and parameters used, or have used the non-standard expression or maybe the values of the variable are not tallying with the physics. This can also be the reason why you are not getting consistent initial values. Solve step by step for each error, once you solve the first 2 issues there are high chances of getting the last step converged. This issue generally arises when initial conditions are too less in comparison to the final result for the given set of boundary conditions. Re-check all the above points and you must be through. Hope you will find the information clear and helpful, All the very best.
With regards
Aprajeeta
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