CFD Online Discussion Forums - [swak4Foam] how to add an inlet expression using groovyc

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how to add an inlet expression using groovyc

Attachment 58006Dear Foamers

I installed swak4foam but I have no idea how to insert my sinusoidal inlet velocity to my inlet boundary in my U file at0 folder.
my velocity profile is
u (y,t)= u(y,t)=2U(1-(y/D)**2)(1+0.2*sin(t))
my geometry is something like the attached file.

Any help is greatly appreciated.
BR,
Mohsen

it is so easy with groovyBC,
it should be something like this:

Code:

type     groovyBC;

variables  "Uinlet=1;D=1;"

valueExpression "vector(2*Uinlet*(1-pow(pos().y/D,2))*(1+0.2*sin(time())))"

warning: i did not check.

Dear Nima
Thanks for your help.I do as you said for another case and geometry but something weired happened after using icoFoam.
I attached my case file and I would be grateful if you update me with my mistakes.

Kind Regards,
Mohsen

mohsen@mohsen-SVE14122CVW:~/Desktop/dilate100p$ icoFoam
/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 4.1 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
Build : 4.1
Exec : icoFoam
Date : Aug 29 2017
Time : 18:00:02
Host : "mohsen-SVE14122CVW"
PID : 20522
Case : /home/mohsen/Desktop/dilate100p
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster
allowSystemOperations : Allowing user-supplied system call operations

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create mesh for time = 0

PISO: Operating solver in PISO mode

Reading transportProperties

Reading field p

Reading field U

--> FOAM FATAL IO ERROR:
Unknown patchField type groovyBC for patch type patch

Valid patchField types are :

76
(
SRFFreestreamVelocity
SRFVelocity
SRFWallVelocity
activeBaffleVelocity
activePressureForceBaffleVelocity
advective
calculated
codedFixedValue
codedMixed
cyclic
cyclicACMI
cyclicAMI
cyclicSlip
cylindricalInletVelocity
directionMixed
empty
externalCoupled
extrapolatedCalculated
fixedGradient
fixedInternalValue
fixedJump
fixedJumpAMI
fixedMean
fixedNormalInletOutletVelocity
fixedNormalSlip
fixedProfile
fixedValue
flowRateInletVelocity
fluxCorrectedVelocity
freestream
inletOutlet
interstitialInletVelocity
mapped
mappedField
mappedFixedInternalValue
mappedFixedPushedInternalValue
mappedFlowRate
mappedVelocityFlux
mixed
movingWallVelocity
noSlip
nonuniformTransformCyclic
outletInlet
outletMappedUniformInlet
outletPhaseMeanVelocity
partialSlip
pressureDirectedInletOutletVelocity
pressureDirectedInletVelocity
pressureInletOutletParSlipVelocity
pressureInletOutletVelocity
pressureInletUniformVelocity
pressureInletVelocity
pressureNormalInletOutletVelocity
processor
processorCyclic
rotatingPressureInletOutletVelocity
rotatingWallVelocity
sliced
slip
supersonicFreestream
surfaceNormalFixedValue
swirlFlowRateInletVelocity
symmetry
symmetryPlane
timeVaryingMappedFixedValue
translatingWallVelocity
turbulentInlet
uniformFixedGradient
uniformFixedValue
uniformInletOutlet
uniformJump
uniformJumpAMI
variableHeightFlowRateInletVelocity
waveTransmissive
wedge
zeroGradient
)

file: /home/mohsen/Desktop/dilate100p/0/U.boundaryField.inlet from line 30 to line 37.

From function static Foam::tmp<Foam::fvPatchField<Type> > Foam::fvPatchField<Type>::New(const Foam::fvPatch&, const Foam::DimensionedField<Type, Foam::volMesh>&, const Foam::dictionary&) [with Type = Foam::Vector<double>]
in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/finiteVolume/lnInclude/fvPatchFieldNew.C at line 134.

FOAM exiting

My OpenFOAM version is 4.1

I reinstalled groovyBC again and changed my valueExpression and the problem seems to be solved.
--------------------------------------------------------------------------------------------------
inlet
{
type groovyBC;
variables "Uinlet=0.3;D=1;u=6*Uinlet*(pos().y/D)*(1-(pos().y))*(1+(0.1*sin(time())));";
valueExpression "vector(u,0,0)";
}
---------------------------------------------------------------------------------------------------
but there is a problem while the flow enters the domain from upper corner of inlet.however it should enters the domain from the middle of channel.
see the enclosed picture.
How can I correct this?

I missed a parameter in my velocity and it was solved . :)

what exactly did u miss?
could you please share your case setup??
so that we can run and see the results

Sure, I will.:)
Please send your email

Kind regards.