| Author | Message | ||
     Paul Harrison (pmh501) New member Username: pmh501 Post Number: 1 Registered: 04-2009 |
Dear Sir, I have a question about the timestep that can be used with FlexPDE Professional 6.04 (2D version). I am currently using FlexPDE to simulate thermal heatflow of laser pulses on a target material. I have a 40 nsec (FWHM) laser pulse, and I want to see how much residual heat is remaining at the surface of the target when the next pulse arrives 167 microsecs later. I am using the time command: time 0 by 1e-8 to 167e-6 which works well, but is very very slow and generates huge datafiles. I need to keep the short time increment of 10 nsecs in order for the laser pulse to be "seen" by FlexPDE, but after the pulse has finished I wonder if a longer time division would produce faster results (say 50 nsecs or 100 nsecs). Is there a way to do this with FlexPDE? I have tried using 2 time commands such as this : time 0 by 1e-8 to 1e-6 time 1e-6 by 50e-8 to 167e-6 but FlexPDE does not like it. Is there any other solution? Thanks for your help (and for some great software) Kind Regards, Paul | ||
| Marek Nelson (mgnelson) Moderator Username: mgnelson Post Number: 120 Registered: 07-2007 |
Historically we have used the MONITORS or PLOTS section to force a timestep at a given time. For example : TIME 0 to 167e-6 MONITORS for t=0 1e-6 2e-6 167e-6 This would force a timestep at the times 1e-6 and 2e-6. In version 6.05 we have also added a new mechanism that may be useful for you in this regard: the CRITICAL time section. This forces a timestep at specific times in the same fashion as mentioned above without forcing a MONITOR or PLOT. (It does not currently allow the use of BY and TO as do the MONITORS and PLOTS sections). For example: TIME 0 to 167e-6 CRTITICAL 1e-6 2e-6 You can download the version update at www.pdesolutions.com/sdmenu6.html If you post your script, I can take a look. Alternatively, if you do not wish your script posted publicly, you can email it to support@pdesolutions.com . |