| Author | Message | ||
     LinYang (huiw84) New member Username: huiw84 Post Number: 1 Registered: 04-2008 |
Hi!I'm new to use FlexPDE.I found "select Tcenter=1/2"in version 2 or 3,but now I am using version 5,when I run the program which includes "select Tcenter=1/2" in version 5, it will be error,and say"TCENTER is no longer supported".so what can I do now?and what's meaning "select Tcenter=1/2"? thank you very much! | ||
| Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 1100 Registered: 06-2003 |
FlexPDE version 5 uses a more advanced form of time integration than versions 2 and 3 did. In the old versions, TCENTER=1/2 chose Crank-Nicholson (time-centered) differencing, which is accurate but sometimes oscillatory. TCENTER=1 chose backward Euler differencing, which is stable but less accurate. In version 5 we use a quadratic backward difference method (Gear's method) that is both stable and accurate. Just remove the TCENTER command from your script. | ||
| LinYang (huiw84) New member Username: huiw84 Post Number: 2 Registered: 04-2008 |
Thank you! |