|
[Sponsors] |
August 30, 2000, 09:23 |
interfaces
|
#1 |
Guest
Posts: n/a
|
Dear Friends, Solving a problem of a transient conduction in non-homogeneous material composed of glass, ceramic immersed in a stagnant fluid, I should determine the interfaces thermal conductivities between materials od different nature. This was done through the heat balance in every interface node (see Patankar for eg.). My question is : The derivation of the interface conductivity suppose that the 02 adjacent nodes in every interface are composed of the same material inorder to be able to apply the equation of Fourier between them. If this is true shall we also determine the interface thermal capacity even if the control volume of the node in the interfaces are just in contact (every control volume is composed of an homogeneous material).? thank you in advance for your contribution
|
|
August 31, 2000, 13:51 |
Re: interfaces
|
#2 |
Guest
Posts: n/a
|
1) For the conductivity, you should use an harmonic mean when you evalute the flux between the control volumes (this is well explained in patankar)(I assume you use finite volumes) 2) For the capacity, this quantity should be constant on each elements (if you use a Galerkin volume type scheme) or constant over a control volume (classical finite volumes). This quantity is volumetric and has nothing to do with the interfaces.
|
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Interpolation of data on interfaces during initialization | Chander | CFX | 7 | August 16, 2011 12:15 |
Numerical inaccuracy at domain interfaces in CFX | Chander | CFX | 2 | March 24, 2011 07:52 |
Subdomain or Interfaces (CHT) | sandeep_tu | CFX | 8 | July 14, 2009 11:06 |
grid interfaces | kiko | FLUENT | 0 | February 13, 2007 10:28 |
Grid interfaces in Fluent | Omar Qazi | FLUENT | 1 | January 28, 2006 18:55 |