[nandiganavishal]

Hi All,




I am trying to incorporate oscillating fixed value boundary condition in my code for a simple rectangular geometry... I want to incorporate boundary condition given as A * sin (wt)..

I did try to implement Oscillating Fixed
value... I wanted to add A*sin(wt) as my boundary condition for my Phi variable ..

All I did was I changed the oscillatingFixedValue.C file which had
1+Asin(wt) to Asin(wt) and gave wmake libso in the
/openfoam/openFOAM-1.5/src/finitevolume directory
then gave wmake to my solver... But I
didn't see any change in the internalfield values for my Phi when I
changed condition from 1+Asin(wt) to Asin(wt)... Further I tried to
incorporate these oscillatingfixedvalue.C and .H files in my solver
folder directly and gave wmake but I got the following error



vishal@vishal-laptop:~/OpenFOAM/vishal-1.5/run/PNP_working_code_500_by_30nm_geometry_5V_transient/co upledFoam$
wmake
SOURCE=oscillatingFixedValueFvPatchField.C ; g++ -m32 -Dlinux -DDP
-Wall -Wno-strict-aliasing -Wextra -Wno-unused-parameter
-Wold-style-cast -O3 -DNoRepository -ftemplate-depth-40
-I/home/vishal/OpenFOAM/OpenFOAM-1.5/src/finiteVolume/lnInclude
-IlnInclude -I.
-I/home/vishal/OpenFOAM/OpenFOAM-1.5/src/OpenFOAM/lnInclude
-I/home/vishal/OpenFOAM/OpenFOAM-1.5/src/OSspecific/Unix/lnInclude
-fPIC -pthread -c $SOURCE -o
Make/linuxGccDPOpt/oscillatingFixedValueFvPatchField.o
oscillatingFixedValueFvPatchField.C:38: error: redefinition of
'Foam::scalar Foam::oscillatingFixedValueFvPatchField<type>::cur rentScale()
const'
oscillatingFixedValueFvPatchField.C:38: error: 'Foam::scalar
Foam::oscillatingFixedValueFvPatchField<type>::cur rentScale() const'
previously declared here
oscillatingFixedValueFvPatchField.C:53: error: redefinition of
'Foam::oscillatingFixedValueFvPatchField<type>::os cillatingFixedValueFvPatchFi eld(const
Foam::fvPatch&, const Foam::DimensionedField<type,>&)'
oscillatingFixedValueFvPatchField.C:53: error:
'Foam::oscillatingFixedValueFvPatchField<type>::os cillatingFixedValueFvPatchFi eld(const
Foam::fvPatch&, const Foam::DimensionedField<type,>&)'
previously declared here
oscillatingFixedValueFvPatchField.C:70: error: redefinition of
'Foam::oscillatingFixedValueFvPatchField<type>::os cillatingFixedValueFvPatchFi eld(const
Foam::oscillatingFixedValueFvPatchField<type>&, const Foam::fvPatch&,
const Foam::DimensionedField<type,>&, const
Foam::fvPatchFieldMapper&)'
oscillatingFixedValueFvPatchField.C:70: error:
'Foam::oscillatingFixedValueFvPatchField<type>::os cillatingFixedValueFvPatchFi eld(const
Foam::oscillatingFixedValueFvPatchField<type>&, const Foam::fvPatch&,
const Foam::DimensionedField<type,>&, const
Foam::fvPatchFieldMapper&)' previously declared here
oscillatingFixedValueFvPatchField.C:86: error: redefinition of
'Foam::oscillatingFixedValueFvPatchField<type>::os cillatingFixedValueFvPatchFi eld(const
Foam::fvPatch&, const Foam::DimensionedField<type,>&,
const Foam::dictionary&)'
oscillatingFixedValueFvPatchField.C:86: error:
'Foam::oscillatingFixedValueFvPatchField<type>::os cillatingFixedValueFvPatchFi eld(const
Foam::fvPatch&, const Foam::DimensionedField<type,>&,
const Foam::dictionary&)' previously declared here
oscillatingFixedValueFvPatchField.C:112: error: redefinition of
'Foam::oscillatingFixedValueFvPatchField<type>::os cillatingFixedValueFvPatchFi eld(const
Foam::oscillatingFixedValueFvPatchField<type>&)'
oscillatingFixedValueFvPatchField.C:112: error:
'Foam::oscillatingFixedValueFvPatchField<type>::os cillatingFixedValueFvPatchFi eld(const
Foam::oscillatingFixedValueFvPatchField<type>&)' previously declared
here
oscillatingFixedValueFvPatchField.C:127: error: redefinition of
'Foam::oscillatingFixedValueFvPatchField<type>::os cillatingFixedValueFvPatchFi eld(const
Foam::oscillatingFixedValueFvPatchField<type>&, const
Foam::DimensionedField<type,>&)'
oscillatingFixedValueFvPatchField.C:127: error:
'Foam::oscillatingFixedValueFvPatchField<type>::os cillatingFixedValueFvPatchFi eld(const
Foam::oscillatingFixedValueFvPatchField<type>&, const
Foam::DimensionedField<type,>&)' previously declared
here
oscillatingFixedValueFvPatchField.C:143: error: redefinition of 'void
Foam::oscillatingFixedValueFvPatchField<type>::aut oMap(const
Foam::fvPatchFieldMapper&)'
oscillatingFixedValueFvPatchField.C:143: error: 'virtual void
Foam::oscillatingFixedValueFvPatchField<type>::aut oMap(const
Foam::fvPatchFieldMapper&)' previously declared here
oscillatingFixedValueFvPatchField.C:155: error: redefinition of 'void
Foam::oscillatingFixedValueFvPatchField<type>::rma p(const
Foam::fvPatchField<type>&, const Foam::labelList&)'
oscillatingFixedValueFvPatchField.C:155: error: 'virtual void
Foam::oscillatingFixedValueFvPatchField<type>::rma p(const
Foam::fvPatchField<type>&, const Foam::labelList&)' previously
declared here
oscillatingFixedValueFvPatchField.C:167: error: redefinition of 'void
Foam::oscillatingFixedValueFvPatchField<type>::upd ateCoeffs()'
oscillatingFixedValueFvPatchField.C:167: error: 'virtual void
Foam::oscillatingFixedValueFvPatchField<type>::upd ateCoeffs()'
previously declared here
oscillatingFixedValueFvPatchField.C:188: error: redefinition of 'void
Foam::oscillatingFixedValueFvPatchField<type>::wri te(Foam:stream&)
const'
oscillatingFixedValueFvPatchField.C:188: error: 'virtual void
Foam::oscillatingFixedValueFvPatchField<type>::wri te(Foam:stream&)
const' previously declared here
make: *** [Make/linuxGccDPOpt/oscillatingFixedValueFvPatchField.o] Error 1
I am also attaching the oscillatingfixedvalues files along with my phi
boundary condition file.. Kindly have a look at them and give your suggestions..Kindly let me know how to proceed further.

Thanks

Regards

Vishal

[nandiganavishal]

oscillatingFixedValueFvPatchField.C
oscillatingFixedValueFvPatchField.H
Phi

[feymark]

Hi Hrv,

You asked for a preference. I think that most people would prefer something like,

return refValue + amplitude*sin(2*pi*frequency*t);

You could of course compile your own local version. But it's much more convenient to have it in a logical way from the beginning.

Keep up the good work!

/Feymark

[samanalafi]

Hi every body,
I have done the corrections recommended in this thread to get an oscillationg cylinder motion and solve it with icoDyMFoam solver. I changed
both files in :
OpenFoam-1.4.1-dev/src/OpenFOAM/PointPatchFields/derived/oscillatingFixedValue/oscillatingFixedValuePointPatchField.C
and them ./Allwmake in src/tetDocompositionFiniteElement
OpenFOAM.1.4.1-dev/src/finiteVolume/fields/fvPatchFields/derived/oscillatingFixedValue/oscillatingFixedValueFvPatchField.C and then wmake libso in src/FiniteVolume.
When I move the mesh by moveDynamicMesh the mesh seems to move ok .
My goal is to obtain the results of Frank Bos for a plunging cylinder at Re = 185 which has the mean drag coefficient around 1.2.
Basically I want y = -Asin(2*pi*f*t) for my cylinder. So I changed the lines in the mentioned files to V = -A*2*pi*f*cos(2*pi*f*t) and then compiled. My settings like motionU, BCs, fvSolution, dynamicMeshDict, ... is exactly the same as those of Frank but I get mean drag coefficient equal to 1.7 which is 40% of.
Please let me know your suggesstions because what ever is recommended in the forum I have done. I will post the case if any body is willing to take a look.
Thanks so much

[stephie]

Helle everyone,

I would like to use oscillatingFixedValue in Foam ext. 3.1
In my case I habe a channel with one foil in it. At the inlet the fluid should oscillate, but at the moment it doesn't. I use the following BC for the inlet:

{
type oscillatingFixedValue;
refValue uniform (1.56 0 0);
// offset
amplitude 0.0577;
frequency 0.8367;
value uniform (1.56 0 0);
}
The velocity should be 1.56, amplitude and frequency are clear. Might anyone explain my what value, refvalue and offset mean? Or are there any other BC for such an oscillating velocity?

Thank you for anyones' help,

best regards,
Stephie

[IonCoolT]

Hi Stephanie!

I have the same doubt as you...

Do you already know what are refvalue and offset?

Cheers

Ion

[stephie]

Dear Ion,

in the end I didn't use offset and refvalue. I changed in the dynamicMeshDict:

so lidBodyMotionFunction o s c i l l a t i n g R o t a t i n g M o t i o n ;
oscillatingRotatingMotionCoeffs
{
origin
(0.05 0 0);
amplitude
( 0 0 3 0 ) ; // i n Grad
omega
3 0 1 . 2 1 2 ; // rad / s
}

The reason why it didn't move, was that I expected the amplitude is a value - but it was an angle.
I am sorry, but I can't remember what offset and refvalue mean.

I hope this will help you.
best regards,
Stephie

[Fanfei]

Originally Posted by stephie

Dear Ion,

in the end I didn't use offset and refvalue. I changed in the dynamicMeshDict:

so lidBodyMotionFunction o s c i l l a t i n g R o t a t i n g M o t i o n ;
oscillatingRotatingMotionCoeffs
{
origin
(0.05 0 0);
amplitude
( 0 0 3 0 ) ; // i n Grad
omega
3 0 1 . 2 1 2 ; // rad / s
}

The reason why it didn't move, was that I expected the amplitude is a value - but it was an angle.
I am sorry, but I can't remember what offset and refvalue mean.

I hope this will help you.
best regards,
Stephie

Hi Stephie:
I have built my oscillation flow, and In the model, the Vof method was included. When silmulation begin, the volume of fluid will decrease gradually, I thought it was the problem of outlet boundary. I have test the condition of inletOutlet and zeroGradient. But they didn't work. so I want to know which boundary condition used in your model.

Best regards
Fan Fei