Questions in Heat transfer simulation

[yassou]

Hi everybody
I have some questions in Heat transfer simulations and I will be appreciate to anyone to answer them.
1)In Property Module, Why we should define the Density?
2)In Heat-Transfer simulation with Transient Response, In Step Module, Can we give the Large enough amount of time (For example: 1000 second) to get the Same Result compare the Steady-State Response (with 1 second)?
3)In Heat-Transfer simulation with Steady-State Response, In Interaction module, If our simulation in Degrees Celsius and from other hand we consider surface-radiation and then choose cavity approximate, we should consider Stefan-Boltzmann constant with 5.669×〖10〗^(-14) (W/〖mm〗^2 K^2 ) magnitude, Shouldn't we Convert Degrees of Kelvin to Degrees of Celsius? Or vice versa?
4)InHeat-Transfer simulation with Steady-State Response, In Load module, With surface-radiation option, why we should Create Predefine Field and give the model Temperature?
5)In Heat-Transfer simulation with Steady-State Response/ Transient Response, In Mesh Module, What will be happened if we choose our element library explicit?
With Best Regards.
Yassou.

 

[Mustaine3]

1. Because it is needed for transient thermal analysis. It is not needed for steady-state.
2. Yes. You can even activate an option that allows to end a step early if steady-state behavior is reached.
3. C and K are not strictly different units, they just have an offset. But you should always make sure that your units fit together.
4. It is always recommended to define an initial temperature for thermal analysis, so you are sure what the starting condition is.
5. You would get an error, since A/Explicit has no pure thermal procedure. It has a fully coupled thermal-structural procedure.