[petsc-users] Error occurred when version change

朱昭霓 zhuzhaoni2017 at hnu.edu.cn
Tue Dec 29 02:51:44 CST 2020

Dear Sir or Madam: 
Hello, I am a new PETSc learner. There are some confusions when I using different versions of PETSc. For some reasons, I have to change my codes from the version 3.6.3 to 3.4.5. Newton methods in 3.6.3 version converged successfully with the time step size dt=100. While with the same dt=100 and almost the same codes, Newton methods in version 3.4.5 failed to converge. The debug test indicated that there may be something wrong during the line search process. I have tried to search the changes in different versions but failed. Could you please give me some suggestions? Thank you so much. 

Best regards,

Zhaoni Zhu
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