March 10, 2022 at 11:11 amnepSubscriber
I'm modeling the solar radiation on a steel plate to see the temperature but I don't see the residual continuity etc.
Could someone give me any clue as to why they do not appear, please? in the configuration I have marked the checks so that they appear in the plot but nevertheless it seems that they are not being calculated...
Thanks a lotMarch 10, 2022 at 2:03 pmRobAnsys EmployeeHow many cells zones have you got, and what are they?
March 10, 2022 at 3:18 pmnepSubscriberTwo zones, one for the air modeled behind the plate (convection) and one for the plate (solid).
March 11, 2022 at 11:52 amRobAnsys EmployeePlease repost the image, I'm not permitted to open attachments.
March 11, 2022 at 12:07 pmnepSubscriberSorry. I have changed the model and I have removed the air zone, to simplify it. now I only have the 15x15 cm modeled plate (1.5mm).
I attach the image of the supplied solar radiation (the checks that the surfaces participate in the solar radiation are activated), but I can't get the residuals to be shown on the graph, I think there are equations that are not being calculated (the residuals checks are marked too).
The configuration is stationary and pressure, with the SIMPLEC method at 1000 iterations... I attach more images.
On the other hand, I can't get that solar radiation reflected on the plate, the plate doesn't change temperature...I think that could be the problem.
Thank you very much for your help.
All the best
March 11, 2022 at 2:04 pmDrAmineAnsys EmployeeScreenshot of Fluent Console to see if continuity residual is zero or not. Do you have inflow/outflow? If not do you have scenario of buoyancy? If yes: gravity on?
March 11, 2022 at 2:25 pmMarch 11, 2022 at 2:31 pmDrAmineAnsys Employeerun for more iterations: under Residual disable convergence by residual to enforce certain number of iterations.
Do you have inflow?
March 11, 2022 at 2:52 pmnepSubscriberI put 10000 iterations as an example and now the energy residual appears, only. And the temperature of the plate is still at 300K, its temperature doesn't increase, I don't understand why the solar radiation doesn't affect the plate. Am I missing something to configure? I suppose that when this happens, the other residuals will appear?
March 11, 2022 at 2:56 pmDrAmineAnsys EmployeePlease add picture to understand the problem: perhaps surface display. Again do you have one or two cell zones? If only solid: continuity will be always zero same with velocity.
March 11, 2022 at 2:59 pmDrAmineAnsys EmployeeTo account for radiation through solids: this should be explicitly enabled under the cell zone condition: please verify that too.
March 11, 2022 at 3:11 pmnepSubscriberSorry, I didn't understand what you mean:
"continuity will be always zero same with velocity"
In models where there is only one body, the continuity and velocity residuals are zero?
Yes, in cell zone condition I also enabled the radiation participation check.
I want the radiation to hit only the face:"placa_con_radiacion" but I don't get it. Always the temperature it's 300K.
March 11, 2022 at 3:30 pmDrAmineAnsys EmployeeIf you have only solid: continuity and momentum residuals will be zero as momentum and continuity do not make a sense for solid.
March 11, 2022 at 4:32 pmRobAnsys EmployeeTo add, as you only have a solid there are no continuity residuals: there's no fluid zone to solve them on. The zero reported is a placeholder because of the way the solver reports work.
March 14, 2022 at 7:31 amnepSubscriberOk, so that doesn't mean that the solution is wrong?
Anyway, it is not normal that it converges in iteration 1, right? the model is not working because the solar radiation is not reaching the first face of the plate, could you tell me why, please? I am missing to model the solar radiation.
Thank you very much
March 14, 2022 at 8:57 amDrAmineAnsys EmployeeIt is not wrong: if you just have solid zones you can disable the solution of continuity and momentum equations.
Disable residual check by convergence and run.
March 14, 2022 at 9:21 amnepSubscriberOk, thank you very much.
And about the solar charging, could you please, tell me what am I doing wrong? I attached a picture in previous comments of the solar configuration.
In cell zone conditions I put that it is a solid (inconel 625 steel) and that solar radiation participates. The material inside is not hollow.
Then, in boundary conditions, in the face where I want the solar radiation to affect, I put via system coupling, which is opaque and the solar radiation participates.
Would this be correct? because the plate still does not increase in temperature in this face, as if no solar radiation was reaching it...
March 14, 2022 at 9:56 amDrAmineAnsys EmployeeI cannot follow-up: are you using Solar Load Model + solid zone?
March 14, 2022 at 11:01 amMarch 14, 2022 at 12:12 pmDrAmineAnsys EmployeeSolar Load Model will work if and only if the first walls you have in your system are semi-transparent.
March 14, 2022 at 12:20 pmnepSubscriberI'm sorry... I don't understand. The steel is opaque, should i put it as semitransparent? would that be correct? because it's not a transparent glass for example, I don't know if that semitransparent check refers to that.
I only have the steel plate.
Thank you very much for your help
March 14, 2022 at 12:24 pmDrAmineAnsys EmployeeThat is the problem.
For all of your external opaque walls, set the BC Type to be semi-transparent, then the absorptivity to 1 and transmissivity to 0 - Initialize the model and do not run.
Now Create a custom-field function for the blackbody temperature, i.e. (Solar Heat Flux/ 5.67e-8)^0.25. Call the function 'radtemp' . -Export profile of the blackbody temperature: Define -> Profiles -> write -> surfaces = all opaque external walls, and select the blackbody custom field function name.
Now change back to Opaque Wall BC's and use the newly exported profile as Outside Radiation Temperature.
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