|
[Sponsors] |
May 26, 2011, 10:52 |
Unsteady Heat Conduction
|
#1 |
New Member
Aimen Sattar
Join Date: May 2011
Posts: 1
Rep Power: 0 |
Hi,
I am trying to model transient response of a porous model to a step reduction in the temperature of one of it's surfaces. I have set the physics model to 'Implicit Unsteady' and have noticed that where I used to input the constant temperature of the surface (in the steady model), there are a number of options including fields as functions of r, t, x,y,z etc. I would greatly appreciate any help Thanks Aimen |
|
May 30, 2011, 16:52 |
|
#2 |
Member
Jonny
Join Date: Aug 2009
Posts: 72
Rep Power: 17 |
Since you have turned the unsteady model on, you now have the option of specifying transient boundary conditions.
If you want the temperature of a wall to change with time, you need to import a table in .csv format which has Time in the first column and Temperature in the second. Then tell Star that you want to use this imported table Table(Time) as the boundary definition for temperature field function. You can specify more complex transient temperature profiles but if you want the entire boundary to be the same temperature use the simple option. |
|
July 10, 2011, 06:42 |
|
#3 |
Senior Member
Join Date: Oct 2009
Location: Germany
Posts: 636
Rep Power: 21 |
When you just want to change the temperature once or with let say two or three steps, you might write a field function.
Simple example: $Time<=10.0?500$Time<=20.0?300:200) This field function changes the value from 500 to 300 after 10 seconds and to 200 after 20 seconds. For more steps, you should use a table like Jonny mentioned before. |
|
Tags |
conduction, heat, star ccm+, step input, unsteady |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
calculating unsteady heat release due to comb | James | FLUENT | 1 | February 27, 2014 20:03 |
one dimensional unsteady heat conduction | vijeshjoshi23 | Main CFD Forum | 1 | July 10, 2009 21:22 |
how to simulate 2d solid heat conduction using CFX | richard | CFX | 3 | March 24, 2008 07:27 |
Heat conduction through solid rib in periodic duct | Dieter Fauconnier | FLUENT | 0 | October 7, 2004 08:22 |
Unsteady Heat Transfer Modeling | Muller | FLUENT | 5 | June 7, 2003 01:28 |