|
[Sponsors] |
Adding Radiations in chtMultiRegionSimpleFoam |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
August 5, 2021, 04:29 |
radiation source
|
#41 |
New Member
pan
Join Date: Apr 2021
Posts: 3
Rep Power: 5 |
Hi,
it seems we need to change the energy equation for solid region. in OF7.0, enthalpy is adopted to solve the energy equation, but in OF8.0, only internal energy could be adopted to solve the energy equation. I tried to add the radiation source term to the solid energy equation, but there always exists something wrong. so can we add the radiation term to the solid energy equation using the internal energy form? |
|
September 21, 2021, 05:42 |
|
#42 |
Member
Bushra Rasheed
Join Date: Dec 2020
Posts: 97
Rep Power: 5 |
Hi!
I don't know much relevant it is in this thread but can anyone guide how to introduce UV radiation boundary conditions in chtMultiRegionSimpleFoam? As in a UV lamp? Thanks |
|
October 4, 2023, 03:24 |
|
#43 | |
Senior Member
Desh
Join Date: Mar 2021
Location: Sydney
Posts: 118
Rep Power: 5 |
Quote:
The issue is, once I applied opaqueSolid radiation model to fluid, and no matter what parameter I change in the radiationProperty file/s, the temperature do not change in any of my solids. Note that the solid radition is also set with opaqueSolid. I am really thinking if the the opaqueSolid can be use in the fluid region, if yes, what it is actually doing ? Any suggestions to clear my confusion is much appreciated. Thanks |
||
October 5, 2023, 12:52 |
|
#44 |
Senior Member
Peter Hess
Join Date: Apr 2011
Location: Austria
Posts: 250
Rep Power: 17 |
Hello and sorry for the late answer!
Well, the problem, as I remember, since it is a while that the topic was in discussion, is that turning on the radtiation in one region in the simulation make it necessery to turn it on in all other regions. At least it was the case in the past. I dont know if it still the same in the newer versions of OF... Now suppose you want to neglegt the radiation in a specefic region and calculate it in others, in this case you need to define a radiation calculation model in the region, that you dont want it to recognize radiation. In this case, you can apply opaqueSolid as a model in this region regardless if it is solid or fluid. That is where this radiation model comes handy. I suggest the following to confirm this opinion (I might be wrong...). Take a tutorial that is multi regions and have radiation and turn the radiation in one of the regions off, letting the other regions turned on. You will see, I hope , that you will get an error massage. Then turn the radiation in this region on and use the opaqueSolid model, you will see that the error massage is disappiers. By furthor opening points I will be glad to discuss with you. Regards Peter Last edited by peterhess; October 6, 2023 at 21:30. |
|
October 8, 2023, 20:20 |
|
#45 |
Senior Member
Desh
Join Date: Mar 2021
Location: Sydney
Posts: 118
Rep Power: 5 |
Hi,
You are not late at all and thank you for taking your time to reply. There is no discussion at all on 'OpaqueSolid in FluidRegion' so your suggestions are much appreciated. I've been testing this for a while with the attached 'test' case. Note that I am using OF7. And it runs without error even if I switch 'off' radiation in fluid region. I've tested this with varied 0-1 emissivities and absorbsivities but all the time I get identical results, even with 'switch off' radiation in the fluid!!!! With the same set-up, If I changed to 'P1 radiation model' in the fluid, then only I have control with emissivity and absorptivity. I am confused why 'OpaqueSolid' radiation model do not respond any of the changes in absorptivity and emissivity parameters. Correct me if I am wrong, the OpaqueSolid will not solve radiation inside the region but only at the boundary. So if I change the radiation properties at the boundary, in 'boundaryRadiationProperties' file, why does it not effect the results ? Thank you Dasith |
|
Tags |
chtmulitregionfoam, chtmultiregionsimpefoam, openfoam, radiation |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Incorporating pyrolysis Model in chtMultiRegionFoam | Archana V | OpenFOAM Programming & Development | 31 | April 2, 2022 03:11 |
multiRegionHeater error | ordinary | OpenFOAM Running, Solving & CFD | 2 | June 9, 2020 18:43 |
chtMultiRegionSimpleFoam: crash on parallel run | student666 | OpenFOAM Running, Solving & CFD | 3 | April 20, 2017 12:05 |
conjugateHeatFoam + interFoam | farhagim | OpenFOAM Programming & Development | 15 | July 19, 2016 08:55 |
chtMultiRegionSimpleFoam | samiam1000 | OpenFOAM Running, Solving & CFD | 39 | March 31, 2016 09:43 |