boundary conditions for heat transfert model

[21did21]

Hello world,

i am a beginner and i test to do a easy model on abaqus.

I want to simulate the transient temperature field for a cube which have this dimensions:
1x1x1meter and this characteristic:
-> conductivity: 3.7e-8 ohm.m
-> density: 2700 kg/m3
-> specific heat: 896 J/(Kg.K)

The problem is: i don't know how i have to made my boundary conditions and load:

=> at initial time my cube is at room temperature
=> at step1 the cube is in a oven at 175°C

1°) i try to put all node at 20°C for the initial step
and erase this boundary conditions for the second step and make all the surface at 175°C but my results are very bad:

=> the temperature don't go in the center of my cube in 100000seconds

can you help me ?

 

[portliner]

The conductivity should be a thermal conductivity not electrical!
unit is W/m/K. For a typical steel its about 30.

Before step 1

*initial conditions, type=temperatur
all_node, 20.

This is NOT a boundary condition!

STEP 1: simulate the cube in the owen by letting it interact with the predefined source temp of 175. This interaction can be modelled via heat transfer *FILM. You have to specify the htc(heat transfer coefficient) W/area/temp_diff, Try the value 10-20 W/m2/K for non-forced convection.

*Film,
surface_name, source_temp(175), htc


The *Film is created in the CAE:
Interaction > surface film condition in a heat transfer step

 

[21did21]

thank a lot for your help, i will try it !