Zero order body terms encounter

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Author Message   Shu-Ting Cheng (coolmouse) Member Username: coolmouse Post Number: 4 Registered: 03-2008 Posted on Friday, March 14, 2008 - 02:38 am:    1 1D-relaxation-bimol.pde (1.4 k) 2 1d-pre_01.tbl (1.7 k) Hello, My problem is about stress relaxation with the vicous term (symbol "h" in the file) increasing with time(h=h0+hrate*t). After this, I encountered the error message "zero order body terms". Please check the file 1 and give me some advice. Thanks alot!   Marek Nelson (mgnelson) Moderator Username: mgnelson Post Number: 28 Registered: 07-2007 Posted on Friday, March 14, 2008 - 07:02 pm:    I don't get this error when I run the script. What version of FlexPDE are you running and on what platform?   Shu-Ting Cheng (coolmouse) Member Username: coolmouse Post Number: 5 Registered: 03-2008 Posted on Sunday, March 16, 2008 - 09:05 am:    5.0.18 Win Xp   Marek Nelson (mgnelson) Moderator Username: mgnelson Post Number: 29 Registered: 07-2007 Posted on Sunday, March 16, 2008 - 02:34 pm:    There are changes in version 5.0.20 that eliminate the error you are seeing in this problem, but there is still a problem with your script. If you plot your variable, you will see that it is discontinuous in space and therefore the spatial derivative will be infinite. See "TechNotes : Avoid Discontinuities" in the help index. I have attached a script that has these plots. bimol1.pde (1.3 k)