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Old   March 8, 2012, 10:59
Unhappy Problem running perturbUCyl
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The question might seem trivial to some, but I am only a beginner with OpenFoam, just 2 weeks into it.

I am trying to simulate pipe flow using LES. I generated the mesh using ICEM CFD and then imported it as Fluent Mesh (.msh file) and then converted it using fluentMeshtoFoam.

I then try to generate turbulence quickly, and hence I try using PerturbCylinder. When I try to run PerturbUcyl on the terminal, the following error message is generated. Any idea, as to how it can be fixed. I am modifying the ChannelFoam inbuilt solver to set up my code.


Quote:
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.1.0 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
Build : 2.1.0-0bc225064152
Exec : perturbUCyl
Date : Mar 08 2012
Time : 12:44:01
Host : "fwss116"
PID : 13356
Case : /home/sen04/OpenFOAM/sen04-2.1.0/testMesh
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster
allowSystemOperations : Disallowing user-supplied system call operations

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

Create mesh for time = 0

Time = 0
Reading U


--> FOAM FATAL IO ERROR:
size 60000 is not equal to the given value of 180297

file: /home/sen04/OpenFOAM/sen04-2.1.0/testMesh/0/U from line 18 to line 60068.

From function Field<Type>::Field(const word& keyword, const dictionary&, const label)
in file /opt/openfoam210/src/OpenFOAM/lnInclude/Field.C at line 236.

FOAM exiting
Many thanks.
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Old   March 12, 2012, 05:46
Default PeturbU
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Hi sen,

I am also a newie in OpenFOAM, and I am also simulating the channel flow in OF using LES. I am also trying to use this utility PeturbU, to generate turbulence in the initial field, but did not get a correct version of it, that can run on my machine. Can you tell me the link?

Quote:
Originally Posted by sen.1986 View Post
The question might seem trivial to some, but I am only a beginner with OpenFoam, just 2 weeks into it.

I am trying to simulate pipe flow using LES. I generated the mesh using ICEM CFD and then imported it as Fluent Mesh (.msh file) and then converted it using fluentMeshtoFoam.

I then try to generate turbulence quickly, and hence I try using PerturbCylinder. When I try to run PerturbUcyl on the terminal, the following error message is generated. Any idea, as to how it can be fixed. I am modifying the ChannelFoam inbuilt solver to set up my code.




Many thanks.
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Old   March 12, 2012, 06:58
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Quote:
Originally Posted by dhruv View Post
Hi sen,

I am also a newie in OpenFOAM, and I am also simulating the channel flow in OF using LES. I am also trying to use this utility PeturbU, to generate turbulence in the initial field, but did not get a correct version of it, that can run on my machine. Can you tell me the link?
You can download it from here,

http://http://www.cfd-online.com/Forums/openfoam-solving/58905-les-turbulent-pipe-flow.html

It seems ok to me.

Though I have solved the problem that I had stated previously, which was caused due to wrong initialisations in the 0 directory, I am still trying to find my way. As it stands now, I have extremely high Courant numbers. The time step that I deduced from the experimental data is 2d-5. Does someone have a suggestion as to how one might go about it, or maybe, what one might try?
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Old   March 12, 2012, 07:56
Default Courant number
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Hi,

Thanks for the reply. Regarding the Courant no, did you fix the maxCo in controlDict? It happened in my case too, when I ran the calculation, but then I had fixed it, and it was stable.

Regards,
dhruv.

Quote:
Originally Posted by sen.1986 View Post
You can download it from here,

http://http://www.cfd-online.com/Forums/openfoam-solving/58905-les-turbulent-pipe-flow.html

It seems ok to me.

Though I have solved the problem that I had stated previously, which was caused due to wrong initialisations in the 0 directory, I am still trying to find my way. As it stands now, I have extremely high Courant numbers. The time step that I deduced from the experimental data is 2d-5. Does someone have a suggestion as to how one might go about it, or maybe, what one might try?
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Old   March 12, 2012, 08:27
Default PerturbU
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Hi,

Can you tell me how did you compile it. I am using wmake perturbU, and it gives in the following error.

Quote:
Making dependency list for source file perturbU.C
could not open file fvCFD.H for source file perturbU.C
g++ perturbU.C -o perturbU
perturbU.C:43:19: error: fvCFD.H: No such file or directory
perturbU.C:44:20: error: Random.H: No such file or directory
perturbU.C:50:28: error: setRootCase.H: No such file or directory
perturbU.C:52:27: error: createTime.H: No such file or directory
perturbU.C:53:27: error: createMesh.H: No such file or directory
perturbU.C: In function ‘int main(int, char**)’:
perturbU.C:62: error: ‘IOdictionary’ was not declared in this scope
perturbU.C:62: error: expected ‘;’ before ‘perturbDict’
perturbU.C:73: error: ‘scalar’ does not name a type
perturbU.C:74: error: ‘scalar’ does not name a type
perturbU.C:75: error: ‘perturbDict’ was not declared in this scope
perturbU.C:75: error: ‘readBool’ was not declared in this scope
perturbU.C:77: error: ‘direction’ does not name a type
perturbU.C:78: error: ‘direction’ does not name a type
perturbU.C:80: error: ‘Info’ was not declared in this scope
perturbU.C:80: error: ‘h’ was not declared in this scope
perturbU.C:80: error: ‘nl’ was not declared in this scope
perturbU.C:81: error: ‘Retau’ was not declared in this scope
perturbU.C:82: error: ‘Switch’ was not declared in this scope
perturbU.C:84: error: ‘streamDir’ was not declared in this scope
perturbU.C:85: error: ‘spanDir’ was not declared in this scope
perturbU.C:86: error: ‘endl’ was not declared in this scope
perturbU.C:91: error: ‘args’ was not declared in this scope
perturbU.C:91: error: ‘FatalErrorIn’ was not declared in this scope
perturbU.C:94: error: ‘FatalError’ was not declared in this scope
perturbU.C:94: error: ‘exit’ was not declared in this scope
perturbU.C:99: error: ‘args’ was not declared in this scope
perturbU.C:99: error: ‘FatalErrorIn’ was not declared in this scope
perturbU.C:104: error: ‘FatalError’ was not declared in this scope
perturbU.C:104: error: ‘exit’ was not declared in this scope
perturbU.C:109: error: ‘direction’ was not declared in this scope
perturbU.C:109: error: expected ‘;’ before ‘heightDir’
perturbU.C:110: error: ‘heightDir’ was not declared in this scope
perturbU.C:114: error: ‘heightDir’ was not declared in this scope
perturbU.C:120: error: ‘IOobject’ was not declared in this scope
perturbU.C:120: error: expected ‘;’ before ‘Uheader’
perturbU.C:128: error: ‘volVectorField’ was not declared in this scope
perturbU.C:128: error: expected ‘;’ before ‘U’
perturbU.C:130: error: expected ‘;’ before ‘transportProperties’
perturbU.C:142: error: ‘dimensionedScalar’ was not declared in this scope
perturbU.C:142: error: expected ‘;’ before ‘nu’
perturbU.C:146: error: ‘dimensionedVector’ was not declared in this scope
perturbU.C:146: error: expected ‘;’ before ‘Ubar’
perturbU.C:152: error: ‘nu’ was not declared in this scope
perturbU.C:153: error: ‘Ubar’ was not declared in this scope
perturbU.C:155: error: ‘scalar’ does not name a type
perturbU.C:156: error: ‘utau’ was not declared in this scope
perturbU.C:160: error: ‘scalar’ does not name a type
perturbU.C:162: error: ‘scalar’ does not name a type
perturbU.C:163: error: ‘scalar’ does not name a type
perturbU.C:165: error: ‘scalar’ does not name a type
perturbU.C:166: error: ‘scalar’ does not name a type
perturbU.C:169: error: ‘Random’ was not declared in this scope
perturbU.C:169: error: expected ‘;’ before ‘perturbation’
perturbU.C:171: error: expected initializer before ‘&’ token
perturbU.C:173: error: ‘centres’ was not declared in this scope
perturbU.C:173: error: ‘celli’ was not declared in this scope
perturbU.C:173: error: ‘forAll’ was not declared in this scope
perturbU.C:174: error: expected ‘;’ before ‘{’ token
perturbU.C:218: error: expected ‘}’ at end of input
make: *** [perturbU] Error 1
Regards,
Dhruv





Quote:
Originally Posted by sen.1986 View Post
You can download it from here,

http://http://www.cfd-online.com/Forums/openfoam-solving/58905-les-turbulent-pipe-flow.html

It seems ok to me.

Though I have solved the problem that I had stated previously, which was caused due to wrong initialisations in the 0 directory, I am still trying to find my way. As it stands now, I have extremely high Courant numbers. The time step that I deduced from the experimental data is 2d-5. Does someone have a suggestion as to how one might go about it, or maybe, what one might try?
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Old   March 13, 2012, 05:20
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Quote:
Originally Posted by dhruv View Post
Hi,

Can you tell me how did you compile it. I am using wmake perturbU, and it gives in the following error.

Regards,
Dhruv
What do you write on the terminal? 'wmake perturbU'? I did the same, and it flashed me the same error.

What you can or rather should do is write 'wmake' only on the terminal. Make sure you are in the 'perturbU' folder, while doing that. It should work, I guess. After that, come out of the perturbU folder and write 'perturbU' on the terminal. The turbulence will be generated I guess.
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Old   March 13, 2012, 05:54
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I found the source of my problem, somewhat though. The modified 'U' field, after I run perturbUCyl is quite unreasonable. Before running perturbUCyl, my internal field is defined uniformly as (1,0,0). After running perturbUCyl, the non uniform internal field varies somewhere in the range of (10e6 - 10e7, 0, 0). Apart from the unusually high Ux, the 0 field for Uz is not expected. Uy is not altered, that is fine, but why Uz?

Anyone with any suggestions?
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Old   March 13, 2012, 07:00
Default PerturbU Compilation error
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Hi sen.1986

Thanks for the input. i tried to compile it. However it again throws up this error.
Quote:
SOURCE=perturbU.C ; g++ -m64 -Dlinux64 -DWM_DP -Wall -Wextra -Wno-unused-parameter -Wold-style-cast -Wnon-virtual-dtor -O3 -DNoRepository -ftemplate-depth-100 -I/soft/OpenFOAM/OpenFOAM-2.1.x/src/meshTools/lnInclude -I/soft/OpenFOAM/OpenFOAM-2.1.x/src/finiteVolume/lnInclude -IlnInclude -I. -I/soft/OpenFOAM/OpenFOAM-2.1.x/src/OpenFOAM/lnInclude -I/soft/OpenFOAM/OpenFOAM-2.1.x/src/OSspecific/POSIX/lnInclude -fPIC -c $SOURCE -o Make/linux64GccDPOpt/perturbU.o
perturbU.C: In function ‘int main(int, char**)’:
perturbU.C:162: error: ‘physicalConstant’ has not been declared
perturbU.C:165: error: ‘physicalConstant’ has not been declared
make: *** [Make/linux64GccDPOpt/perturbU.o] Error 1
I took a look in the perturbU.C file, where there is a mention of physical constant. How can we specify this constant? What is the significance?

Regards,
Dhruv.

Quote:
Originally Posted by sen.1986 View Post
What do you write on the terminal? 'wmake perturbU'? I did the same, and it flashed me the same error.

What you can or rather should do is write 'wmake' only on the terminal. Make sure you are in the 'perturbU' folder, while doing that. It should work, I guess. After that, come out of the perturbU folder and write 'perturbU' on the terminal. The turbulence will be generated I guess.
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Old   March 13, 2012, 08:57
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Quote:
Originally Posted by dhruv View Post
Hi sen.1986

I took a look in the perturbU.C file, where there is a mention of physical constant. How can we specify this constant? What is the significance?

Regards,
Dhruv.
No idea. Check the perturU.c file and your initialisations. (0 directory). Sorry for not being of much help.
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Old   March 13, 2012, 09:33
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Ok, so I found this. The perturbUCyl is functional when I keep the inlet values at zeroGradient. But when I try to put them as cyclic (which is what I need), the following error message is flashed.

Quote:
/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.1.0 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
Build : 2.1.0-0bc225064152
Exec : perturbUCyl
Date : Mar 13 2012
Time : 14:32:25
Host : "fwss116"
PID : 6645
Case : /home/sen04/OpenFOAM/sen04-2.1.0/testMesh
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster
allowSystemOperations : Disallowing user-supplied system call operations

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

Create mesh for time = 0



--> FOAM FATAL ERROR:
face 0 area does not match neighbour by 23.4543% -- possible face ordering problem.
patch:INLET_half0 my area:2.35009 neighbour area:2.97451 matching tolerance:0.0001
Mesh face:534768 fc0 -16.2802 18.383)
Neighbour fc0 24.4505 1.86661e-05)
If you are certain your matching is correct you can increase the 'matchTolerance' setting in the patch dictionary in the boundary file.
Rerun with cyclic debug flag set for more information.

From function cyclicPolyPatch::calcTransforms()
in file meshes/polyMesh/polyPatches/constraint/cyclic/cyclicPolyPatch.C at line 220.

FOAM exiting
What could have been causing this? All ideas are welcome.
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Old   March 13, 2012, 09:38
Default perturbU compilation
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Hi

I got the correct answer from this link. Now it works.

makeAxialMesh for OpenFoam-2.0.0

Quote:
Originally Posted by sen.1986 View Post
No idea. Check the perturU.c file and your initialisations. (0 directory). Sorry for not being of much help.
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Old   March 13, 2012, 09:44
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Quote:
Originally Posted by dhruv View Post
Hi

I got the correct answer from this link. Now it works.

makeAxialMesh for OpenFoam-2.0.0
Nice! So if you don't mind telling, what conditions are you using for 'inlet' and 'outlet' in the, /0/U file, Boundary field?
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Old   March 13, 2012, 09:49
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Hi sen,

I was a little late in posting, but the above post is related to the compilation and the problem I was facing with physicalConstant. The link given in my post addresses that.

Secondly, I am using cyclic condition for my inlet and outlet. I ran perturbU but did not encounter these errors. However, I did have error like this, when I tried to run my case having cyclic patches in parallel. The only thing I can recommend you is to try to use createPatch to generate your cyclic patches. I hope it helps.

Quote:
Originally Posted by sen.1986 View Post
Nice! So if you don't mind telling, what conditions are you using for 'inlet' and 'outlet' in the, /0/U file, Boundary field?
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Old   March 15, 2012, 06:13
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Hello Dhruv,

I got rid of the previous problem. I redid my meshing and modeling, this time using blockmeshdict. The reported problems are mainly caused due to orientation problem of faces.

Anyway, my problem with perturbU is far from being over. The 'U' field that perturbU generates, is very unreasonable. The Ux are in the range of ~4000, Uy is 0 (understandably so), Uz is also 0 (Why?).

Do you have any idea, what might be causing this? Also, it would be helpful if you could attach three files, your 'transportproperties', 'U' after you run perturbU and the script, perturbU.c. Sorry for sounding too demanding.
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Old   March 23, 2012, 05:12
Default PerturbU
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Hi Sen,

Sorry for the late reply. Can you tell me the following:

1. What is the velocity that you impose at the beginning of the channel?
2. How did you calculate the expected U_tau and Re_tau?

I am also having the problems with perturbU, that it does not generate the fields in my whole geometry. I am pretty sure, that I am not wrong in giving the dimensions for the channel case, that I have. I am attaching the pictures of the fields getting generated. As you can see, Uz is being generated only in a part of the channel, and the whole thing.

My transport properties are
Code:
/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.1.x                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "constant";
    object      transportProperties;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

Ubar            Ubar [ 0 1 -1 0 0 0 0 ] ( 0.8 0 0 );

Retau           Retau [ 0 0 0 0 0 0 0 ] 5;

transportModel  Newtonian;

nu              nu [ 0 2 -1 0 0 0 0 ] 1.52e-06;

//Retau           Retau [ 0 0 0 0 0 0 0 ] 500;

CrossPowerLawCoeffs
{
    nu0             nu0 [ 0 2 -1 0 0 0 0 ] 1e-06;
    nuInf           nuInf [ 0 2 -1 0 0 0 0 ] 1e-06;
    m               m [ 0 0 1 0 0 0 0 ] 1;
    n               n [ 0 0 0 0 0 0 0 ] 1;
}

BirdCarreauCoeffs
{
    nu0             nu0 [ 0 2 -1 0 0 0 0 ] 1e-06;
    nuInf           nuInf [ 0 2 -1 0 0 0 0 ] 1e-06;
    k               k [ 0 0 1 0 0 0 0 ] 0;
    n               n [ 0 0 0 0 0 0 0 ] 1;
}


// ************************************************************************* //
My perturbUDict file is

Code:
/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  1.0                                   |
|   \\  /    A nd           | Web:      http://www.openfoam.org               |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/

FoamFile
{
    version         2.0;
    format          ascii;

    root            "/home/penfold/mattijs/foam/mattijs2.1/run/icoFoam";
    case            "cavity";
    instance        "system";
    local           "";

    class           dictionary;
    object          perturbUDict;
}

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //


// Expected turbulent Re(tau) Reynolds number with respect to utau
Retau 395;

// Streamwise component of flow. 0=x, 1=y, 2=z
streamwise 0;

// Spanwise component of flow. 0=x, 1=y, 2=z
spanwise 2;

// Halfheight of channel. This is the direction normal to both streamwise and
// spanwise directions.
h 0.0024;

// Set (overwrite) velocity to laminar profile
setBulk false;

// Perturb velocity with some cosine like perturbations
perturb true;

// Perturbation properties
//wall normal circulation as a fraction of Ubar/utau
duplus 0.25;
//spanwise perturbation spacing in wall units
betaPlus 200;
//streamwise perturbation spacing in wall units
alphaPlus 500;
//transverse decay
sigma 0.00055;
//linear perturbation amplitude as a fraction of Ubar
epsilon 0.005;


// ************************************************************************* //
Quote:
Originally Posted by sen.1986 View Post
Hello Dhruv,

I got rid of the previous problem. I redid my meshing and modeling, this time using blockmeshdict. The reported problems are mainly caused due to orientation problem of faces.

Anyway, my problem with perturbU is far from being over. The 'U' field that perturbU generates, is very unreasonable. The Ux are in the range of ~4000, Uy is 0 (understandably so), Uz is also 0 (Why?).

Do you have any idea, what might be causing this? Also, it would be helpful if you could attach three files, your 'transportproperties', 'U' after you run perturbU and the script, perturbU.c. Sorry for sounding too demanding.
Attached Images
File Type: jpg Uat0time.jpg (16.7 KB, 30 views)
File Type: jpg UafterperturbU.jpg (19.9 KB, 21 views)
File Type: jpg UxafterperturbU.jpg (19.2 KB, 19 views)
File Type: jpg UyafterperturbU.jpg (15.5 KB, 19 views)
File Type: jpg UzafterperturbU.jpg (21.4 KB, 42 views)
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