August 2, 2022 at 9:38 pmmehdi.salakhiSubscriber
I did a simulation with the particle combustion module in Ansys Rocky. However, the value of heat of radiation rate I calculate by hand is totally different than the value I get from Rocky. Therefore, I just changed the heat of radiation rate to a fixed value (like 1 W) in the C++ code, and compiled the code. I was expecting to see a 1 W value, but it shows a garbage value attached in the screenshot. There is nothing much I can do for this problem, so I was thinking maybe there is a bug in the core of the code to which I don't have access. I was wondering can someone help me with this?
August 3, 2022 at 9:55 amRobert WoolhouseAnsys Employee
I’ve not tried that module (yet) but do know the radiation models are less developed than in Fluent. Are you coupling with Fluent, and how high is the solids fraction? I can't see the image, but suspect that's a forum issue, hopefully that'll turn up when they fix whatever else went wrong overnight.
August 3, 2022 at 2:18 pmmehdi.salakhiSubscriber
Thanks for your reply!
To answer your questions:
Are you coupling with Fluent? yes as the combustion module is only applicable by coupling with CFD!
how high is the solids fraction: so it's a fluidized bed with a height of almost 0.1 out of 0.5 m.
The problem is not related to any physical concept. For the starter, let's forget about any physical concept like radiation heat transfer. In the combustion module, I just defined the rate of heat transfer to be a fixed value of 1 W and I'd expect to see this value in the UI of the software as well no matter what happens. But it is showing a totally different fixed value. I tried to attach the screenshot again. Hopefully, you could see it!
August 3, 2022 at 3:28 pmRobert WoolhouseAnsys Employee
Where did you set the heat transfer rate? Just wondering if it's W/m2 or W/m3 that you've set.
August 3, 2022 at 4:27 pmmehdi.salakhiSubscriber
Thanks for your reply!
I also checked the units. The heat transfer here is defined for solid particles as the following equation. So, the unit is W.
mc(dT/dt)p=qreaction + qradiation
Where did you set the heat transfer rate?
As you may know, Rocky has ready-to-use costume modules that can be added to the software. Inside the source code of the particle combustion module, I just corrected the radiation heat transfer to 1 W.
August 3, 2022 at 4:30 pmmehdi.salakhiSubscriber
Here I also wanted to show the part of the code that calculates the heat transfer rate//double rate_heat_radiation = particle_area * data->emissivity * data->stefan_boltzmann * (pow(gas_temperature, 4.0) - pow(particle_temperature, 4.0));double rate_heat_radiation = 1; //this is what I corrected
August 8, 2022 at 4:21 pmRobert WoolhouseAnsys Employee
I think you're looking in the wrong bit of the API. I've heard back, and what I'm seeing isn't what you have in the above. However, I also can't post information that's not in the publically available documentation. Rocky documentation isn't in the normal install, so I need to see if it's in the imminent 22R2 version.
What you do need to look for are some non-dimensional terms in the macros: I don't think you're adding the correct amount of heat.
- You must be logged in to reply to this topic.
Simulation World 2022
Check out more than 70 different sessions now available on demand. Get inspired as you hear from visionary companies, leading researchers and educators from around the globe on a variety of topics from life-saving improvements in healthcare, to bold new realities of space travel. Take a leap of certainty and check out a session today here.
Earth Rescue – An Ansys Online Series
The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.
Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.
- Error with workbench SceneGraphChart
- Workbench error
- Workbench not opening
- How can I renew ANSYS student version license?
- License Error
- An error occurred when the post processor attempted to load a specific result.
- Licensing error while opening ANSYS Mechanical
- Licensing Error
- Problem with FlexNet Licensing
- ConfigureThisMachine Returns Error 1