Radiation BC in non-linear steady state heat transfer. SimLab: Optistruct

Feroz
Feroz Altair Community Member
edited December 2023 in Community Q&A

Hello, 

 

I am setting up a simulation of a device in space to analyze a thermal management system. This is made up of insulation and multi-layer radiative cooling components.

 

I set up the same model in Ansys Mechanical before, it uses a view factor radiation model and calculates radiosity from surface-to-surface and surface-to-ambient (3 Kelvin, vacuum). 

 

Originally I was processing this model in HWCFD, however, the implementation of P1 or DO models is too time-consuming while we are iterating out the design. I would like to replicate the model I made in ANSYS before but running into some issues. The OptiStruct reference and command manuals seem to be less detailed than the AcuSolve one. 

 

I am using non-linear steady-state heat transfer. There is a wall temperature BC of 2000K at the centre of the device and a wall heat flux of approx. 700kW/m2. I have split each surface layer such that each body has an internal (_I) and an external (_O) radiation surface. I have assumed the absorptivity and the emissivity are the same. 

However, I notice it says "view factor". I can't be expected to calculate the view factor myself, can I? It's a simple calculation for a computer to do in minutes. And it's a long tedious one for me. So I am assuming it gets calculated if I leave it as zero, is that correct? 

Ansys Mechanical asks to indicate if it is surface-to-surface or surface-to-ambient, How do I get something similar in SimLab?

image

imageimage

 

Would appreciate some insight, thanks! 

Tagged:

Answers

Categories