Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
changing boundary cond. with time
Posted 12 mars 2013, 09:00 UTC−4 Heat Transfer & Phase Change Version 4.3a, Version 5.0, Version 5.1 2 Replies
Please login with a confirmed email address before reporting spam
Hello,
I want to ask for advice how to change boundary condition in time. E.g. I have exact temperature on boundary for 3600 sec. and after this time, I want to change this boundary to insulation. I've tried using Convective cooling function with very high and low user definied heat transfer coefficient as a function of time.
But now, I want to have one boundary that is insulated and after some amout of time it will become Convective cooling (Internal forced convection), so I can't change the heat transfer coef. I've tried to set velocity of external fluid to zero, but it didn't work quite well (still some heat fluxes through boundary).
I've also tried to make more study steps that will continue one after other, but than it's hard to manage with results. Time series results doesn't make continuous solutions, i cant export animations, etc..
I hope, there's some great solution for this, that i've missed.
Best regards, Jan.
I want to ask for advice how to change boundary condition in time. E.g. I have exact temperature on boundary for 3600 sec. and after this time, I want to change this boundary to insulation. I've tried using Convective cooling function with very high and low user definied heat transfer coefficient as a function of time.
But now, I want to have one boundary that is insulated and after some amout of time it will become Convective cooling (Internal forced convection), so I can't change the heat transfer coef. I've tried to set velocity of external fluid to zero, but it didn't work quite well (still some heat fluxes through boundary).
I've also tried to make more study steps that will continue one after other, but than it's hard to manage with results. Time series results doesn't make continuous solutions, i cant export animations, etc..
I hope, there's some great solution for this, that i've missed.
Best regards, Jan.
2 Replies Last Post 24 août 2015, 21:53 UTC−4
Please login with a confirmed email address before reporting spam
Posted:
1 decade ago
Hi
I would suggest to split your model into two sequential time series (with a manual "store solution" in between) then you can change the enable/disable of your BC's.
To use all solutions you need to "join" then two data sets, but just now I have a doubt if it's possible to concatenate two time series in 4.3a, it could still be on the wish list ;)
Then pls report to "support" to give higher priority to this feature.
--
Good luck
Ivar
I would suggest to split your model into two sequential time series (with a manual "store solution" in between) then you can change the enable/disable of your BC's.
To use all solutions you need to "join" then two data sets, but just now I have a doubt if it's possible to concatenate two time series in 4.3a, it could still be on the wish list ;)
Then pls report to "support" to give higher priority to this feature.
--
Good luck
Ivar
Please login with a confirmed email address before reporting spam
Posted:
9 years ago
Hi
I would suggest to split your model into two sequential time series (with a manual "store solution" in between) then you can change the enable/disable of your BC's.
To use all solutions you need to "join" then two data sets, but just now I have a doubt if it's possible to concatenate two time series in 4.3a, it could still be on the wish list ;)
Then pls report to "support" to give higher priority to this feature.
--
Good luck
Ivar
Hi, Ivar Kjelberg
I have a problem same as this ,I wonder how to split a model into two sequential time series? thanks a lot.