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.
Heat transfet with melting front
Posted 2015年3月5日 GMT-5 06:35 Heat Transfer & Phase Change, Geometry, Mesh Version 5.0 3 Replies
Please login with a confirmed email address before reporting spam
Hello,
I have modeled an ice sample (filled with water in gaps) in "Heat transfer" module. For right boundary i use symmetry, for surface i apply temperature and for other boundaries - thermal isulation. In result, i want to observe, how the boundary between ice and water move (how ice grow up), so i use "deformed geometry" for all domains and "prescribed normal mesh velocity" for boundaries betwen ice and water.
I can calculate only three hours of simulation, but need three days. I've get error "Repeated error test failures. May have reached a singularity."
I don't know how to make my initial conditions better and maybe something wrong with my step function, but i couldn't find mistake.
Best regards,
Daria Ksenofontova
I have modeled an ice sample (filled with water in gaps) in "Heat transfer" module. For right boundary i use symmetry, for surface i apply temperature and for other boundaries - thermal isulation. In result, i want to observe, how the boundary between ice and water move (how ice grow up), so i use "deformed geometry" for all domains and "prescribed normal mesh velocity" for boundaries betwen ice and water.
I can calculate only three hours of simulation, but need three days. I've get error "Repeated error test failures. May have reached a singularity."
I don't know how to make my initial conditions better and maybe something wrong with my step function, but i couldn't find mistake.
Best regards,
Daria Ksenofontova
Attachments:
3 Replies Last Post 2015年3月6日 GMT-5 04:47
Please login with a confirmed email address before reporting spam
Posted:
10 years ago
Hello,
The problem comes from your mesh. Don't use boundary layer mesh, velocity is very low.
It's better to decrease relative tolerance is deforemd studies.
Mapped mesh is very good for deformed studies.
I tried with mapped max size mesh = 10 m (joined picture) with relative toerance = 0.001
Be carefull, I think that in Stephan condition the interface must be at a constant Temperature
Julien
The problem comes from your mesh. Don't use boundary layer mesh, velocity is very low.
It's better to decrease relative tolerance is deforemd studies.
Mapped mesh is very good for deformed studies.
I tried with mapped max size mesh = 10 m (joined picture) with relative toerance = 0.001
Be carefull, I think that in Stephan condition the interface must be at a constant Temperature
Julien
Attachments:
Please login with a confirmed email address before reporting spam
Posted:
10 years ago
Thank you very much! It works now!
Please login with a confirmed email address before reporting spam
Posted:
10 years ago
And could I ask one more question? Does it matter which interpolation ( global or local) to choose? And if I should choose the same (global or local) for both interpolation and variables?
Best regards,
Daria Ksenofontova.
Best regards,
Daria Ksenofontova.