[QuantumDart]

Hello all,

I need to set location Dependant boundary condition.

In a simplified case:

flow through a square pipe is being simulated.

The lower wall of the square pipe is heated(T=400k) starting from 1/4th of the length from the beginning and before its adiabatic.

how do I realize this(or similar) boundary condition???

Thanks!

[Sugajen]

Quick answer is to make two different patches for the adiabatic and T=400K. There maybe better ways as well.

best,
Sugajen

[QuantumDart]

I tried to do that. The problem is that I am not able to split the patches in starccm+ where i am doing my meshing.

If there is a way to do that would be good to know as well otherwise is there any way to do this independently in OpenFOAM as it would be the easiest for me.

Thanks

[sheaker]

I have not enough time to check for sure if this is what You are looking for but maybe You could check.
patch splitting for different boundary conditions

[QuantumDart]

As i understand its only useful for people using blockMesh so i would not be able to do it as i export my mesh from starccm+ Thanks for your input tho

[sheaker]

Ok. When You convert Your mesh to openFoam format use two tools:
faceSet and boxToFace like in the example below:

echo "faceSet detachFacesIntake new boxToFace (-0.035 -0.01 0) (-0.015 0.01 0)" > detachFacesIntake.setSet
runApplication setSet -batch detachFacesIntake.setSet -latestTime
mv log.setSet log.setSetIntake
rm -f detachFacesIntake.setSet

echo "faceSet detachFacesExhaust new boxToFace (0.015 -0.01 0) (0.035 0.01 0)" > detachFacesExhaust.setSet
runApplication setSet -batch detachFacesExhaust.setSet -latestTime
mv log.setSet log.setSetExhaust
rm -f detachFacesExhaust.setSet

rm -f $meshDir/sets/*_old*

[QuantumDart]

I don't get how do the tools work and how to implement them.
also upon googling i found that the faceSet tool has been discontinued. does the code remain the same ?


I am new to openFOAM so sorry for the dumb question. :P

ps:I am using ccm26Tofoam for the converting.

[sheaker]

I was using this script in sonicTurbDymEngineFoam for openFoam ext 1.6.
You need to create bash script with similar code and run it in terminal.

First line save faces with its centers inside the box of boxToFace to detachFacesIntake.setSet file with detachFacesIntake 'name'.

echo "faceSet detachFacesIntake new boxToFace (-0.035 -0.01 0) (-0.015 0.01 0)" > detachFacesIntake.setSet

Second line creates boundary named detachFacesIntake based on Your detachFacesIntake.setSet file.

runApplication setSet -batch detachFacesIntake.setSet -latestTime

I think that You should be able to use it in Your version of openFoam but I'm not 100% sure about setSet .