I'm doing a thermal analysis in transient mode, with a thermal load of temperature (it grows from 100K-400K). The final results are some temperatures of 800K! Does anybody know what I'm doing wrong?

Thank you in advance!

Alberto Canals

I'm doing a thermal analysis in transient mode, with a thermal load of temperature (it grows from 100K-400K). The final results are some temperatures of 800K! Does anybody know what I'm doing wrong?

Thank you in advance!

Alberto Canals

Hi Jared,

Thank you for your help. I'm working on a project for my university. Let me introduce you a little bit more my simulation. I'm trying to simulate the behavior of a lunar rock under lunar conditions (see how the heat increases with the temperature among a lunar rock). In the moon there is radiation and conduction, not convection. For simplifying the simulation, I decided to apply a thermal load of temperature increasing from 100K to 400K (I know

that the lunar temperature in the surface increases from 100K to 400K in 7 days).

For understanding the results I've realized some simulations just for 5000s. The result of the thermal study 1 is the brick at 100K.

I attach a picture with the temperature conditions and with the results. If you have any suggestion for the BC, please let me know!!

For more complex geometries, the area with very high temperatures (800k) is bigger.

in your analysis

you have only told the software that the part has a specific temperature

you need to apply radiation manually

I do agree, but in fact I don't still understand why if said that that face had a temperature (growing from 100-400) , why I obtain some parts with a temperature of 650K!!

In addition, I tried to do a simulation with a heat flux over one face (2000W/m^2), and here are the results. I would spect an uniform temperature in the face where I applied the heat flux (I didn't applied any convection or radiation).

Hi Alberto,

You may have a wave number problem. If your time step is too large compared to the speed of heat and the size of your elements, your model will be unstable. That is one possible explanation for the unphysical results you are getting.

2013 SOLIDWORKS Help - Thermal - Options

my guess is you don't have a boundary condition for getting the heat out

all faces that do not have a BC applied to them are assumed to be insulated

so most problems should have a heat input and then heat output, otherwise temperature will grow exponentially