How to set the radiationProperties for transparent solid material
 

Dear CFDer


I'm trying to use openfoamV11 (foundation edition) to simulate PVD reactor,


The highest temperature in the case is around 2000 degree. So I need to use the radiation model. Now I use the fvDOM method to simulate the radiation.


But for the solid material, I have nontransparent graphite and transparent quartz.


So I want to know how to set these two material?


The default setting for the solid is as following




radiation on;

radiationModel opaqueSolid;

absorptionEmissionModel constant;

absorptivity absorptivity [0 -1 0 0 0 0 0] 0.01;

emissivity emissivity [0 -1 0 0 0 0 0] 0.2;

E E [1 -1 -3 0 0 0 0] 0;

scatterModel none;

sootModel none;


Should I also set the radiationProperties of the transparent quartz the same with air?


thank you



LI

Hey!


Transparent medium is not implemented currently, only transparent boundaries.


I tried several workarounds to achieve the same thing you are doing, but the main issue is that the radiative fields are not communicating between two regions of a CHT case.


Good luck to you, and if you do manage to find a solution, please share it, it is a feature I would love to see implemented!

Thank you for your reply.
The following are the boundary conditions I set.

type greyDiffusiveRadiation;
value uniform 0;
emissivityMode solidRadiation;
emissivity uniform 1;



So, as you said, the emissivity of the gas-solid interface (transparent solid) is 0, and the emissivity of the gas-solid interface (completely opaque) is 1, is that right?

Yep, but OpenFOAM does not compute a radiative field inside solid regions, so whatever you set at the boundary, the radiation will be converted to heat conduction inside the solids.


I tried to use a fluid region with frozen flow on, but there is not only one radiative field, each region has its own. Meaning that an incident ray from region 1 will hit the interface between region 1 and region 2, and its angle of incidence won't matter when region 2 will compute radiation, the radiation from region 1 will be re-computed according to the boundary properties for region 2, if that makes sense...

Thank you


But Can I use fvDOM model for solids?