|April 23, 2012, 10:08||
Conjugate Heat Transfer
Join Date: Oct 2010
Posts: 302Rep Power: 8
Iam working on a CHT analysis. I carried out a test run with a pure tet mesh with out any prisms.
Radiation is invoked and Buoyancy settings are applied.
I see that there is a drastic difference in the temperatures on the Fluid side and solid side of the Fluid Solid interface.
The maximum temperature on the Fluid side is around 192 [C] and on the Solid side it is around 980 [C] and this is with reference to the conservative values.
However when the Hybrid values are used , the temperatures on the Fluid side match with those on the solid side.
Could some one please provide an explanation to this
|April 23, 2012, 12:39||
Edmund Singer P.E.
Join Date: Aug 2010
Location: Minneapolis, MN
Posts: 494Rep Power: 10
It is working as it is supposed to.
Hybrid values in cfx enforce display of fluid results to take on boundary condition values. Conservative values are the results from the fluid finite volume at the wall.
You are probably concerned with the extremely high temperature of your solid. Since you are not inflating at the wall you are relying purely on the wall functions for your near wall values. This can have a drastic effect on your results at the wall, and will particularly be noticable in natural convection dominated problems.
Even if the wall functions correctly model your near wall conditions, these temps might not be unrealistic. Did you do a hand calc based on the wall heat flux of your problem, perhaps simplifying it down to vertical and horizontal walls? Might just be too much heat to pull out for the condition you are running.
|Thread||Thread Starter||Forum||Replies||Last Post|
|Quenching simulation : how to set up a conjugate heat transfer between solid&liquid||Rockda||FLUENT||23||March 15, 2015 00:19|
|Heat Flux at wall in a conjugate heat transfer problem||Chander||CFX||2||July 9, 2011 22:22|
|Convective / Conductive Heat Transfer in Hypersonic flows||enigma||Main CFD Forum||2||November 1, 2009 23:53|
|Conjugate heat transfer and radiation modeling questions||shankara.2||FLUENT||0||April 21, 2009 15:55|
|Convective Heat Transfer - Heat Exchanger||Mark||CFX||6||November 15, 2004 16:55|