Parabolic velocity Boundary Condition in OpenFOAM | codedFixedValue

In this video you can learn how to set up a parabolic BC for inlet patch. Using codedFixedValue boundary we can give any expression and it will generate that non uniform velocity for the patch.
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#openfoam​ #paraview​ #cfd​ #parabolic #velocity #programming

[@user-it1qu2on5l]

Very kind and detailed explanation. I like this video. Thanks a lot!

[@user-gt2un8kh7c]

Yesss!!! This is what I needed.

[@MohammedAli-ic2wt]

Great! Explaned the code very well and also the application. Really helped a lot. Will use it in my solver.

[@shouvikghorui6784]

Helpful Thank you!

[@DiegoAndrade]

bravo and thank you

[@naveenjose9429]

How the code forms in a 2D case with flow in x direction and diameter in y direction

[@neranjanrathnayake2936]

Thank you for your video. I want to apply radiation in the temperature field. How can the applied radiation equation be in the temperature field using coded mixed BC.

[@mitch.crockett]

Is there a way I can download these tutorial files?

[@shobhitgautam7058]

sir if we want powerLaw velocity profile then what i need to change in code ?

[@InaamaliMalik]

Hi, how can we apply parabolic velocity profile using codedFixedValue BC in overSet meshes ? Any guideline/ idea/ recommendation ?

[@kwanglee719]

i follow your steps and compile code, error as:
0/U.boundaryField.inlet:45:15: error: ‘Cf’ was not declared in this scope
can you give me a hint ?, many thanks

[@professor.joao.r.andrade]

Thank you for the video. I applied this boundary condition for temperature. However, I'd like to apply it to an imposed heat, is it possible?

[@DDFluids]

Yes, you can modify the expression and make it for the scalar field.

[@parthdevbundela6744]

Hi sir, can you please tell me how to give boundary condition for velocity inlet which is varying with time, instead of spatial variation

[@geronimo1007]

a simple ramp example:
#{
const scalar t = this->db().time().value();
operator==(min(10, 0.1*t));
#};

[@salchicasvoladoras]

"---> FOAM FATAL IO ERROR: Unknown patchField type parabolicVelocity for patch type patch" why do I keep getting this error. I set the type "codedFixedValue" and then name "parabolicVelocity" I dont get it :(

[@tassawariqbal3694]

hey, I had the same issue, I forgot to put the semi colon on the closing bracket #}.

[@yagnadurbhakula5792]

It's very helpful. Can you also explain how to use codedFixedValue for scalar field (temperature)

[@DDFluids]

For scalar fields, you can remove 2 components from the equation. That should work. If you need any help, please do let me know.

[@yagnadurbhakula5792]

@@DDFluids I tried what you have told, but an error is showing up
--> FOAM FATAL IO ERROR:
keyword name is undefined in dictionary "/home/yagna/OpenFOAM/project/gradient/0/T/boundaryField/left"
file: /home/yagna/OpenFOAM/project/gradient/0/T/boundaryField/left from line 31 to line 101.
From function const Foam::entry& Foam::dictionary::lookupEntry(const Foam::word&, bool, bool) const
in file db/dictionary/dictionary.C at line 799.

[@DDFluids]

Did you gave name to your boundary condition?

[@DDFluids]

In the tutorial one entry is there "name parabolicVelocity;" the same way you need to give some name to your boundary.

[@yagnadurbhakula5792]

@@DDFluids yes i have given the name..actually i need to give codedfixedvalue boundary condition on left and right boundaries..so i have given "leftBC" and "rightBC" respectively in codedfixedvalue code

[@asifraj321]

Very very important tutorial. Thank you so much.
--> FOAM FATAL IO ERROR:
Failed wmake "dynamicCode/parabolicVelocity/platforms/linux64GccDPInt32Opt/lib/libparabolicVelocity_acd2aaca919d7a166a948cf1daab1ba94e58d104.so"
file: /home/Desktop/try/0/U/boundaryField/inlet from line 24 to line 49.
what should i do now bro.

[@manuelfonseca1723]

i had this same problem, i read that happens for a security issue in OF code, it solves only enabling the lines of the code and recompiling the OF but i didn't try it.

[@manuelo1738]

Why is the 0 file not showing the correct boundary?

[@DDFluids]

Custom boundary will start calculating after 0 sec. So whatever expression we are giving is not applied to 0 sec but as in when simulation starts, it will give correct value. But at 0 sec it will show you a dummy value or default value or placeholder. That is there in the code right before expression.

[@manuelo1738]

@@DDFluids Is that the intended behaviour? Hopefully OF explicit and implicit operatores (grad, div, laplacian) will take that into consideration, otherwise for time 0 you will do calculations with the place holder :V

[@InaamaliMalik]

Hi, thank you for the video, please upload case files if possible. thank you.