PerturbU

hadi · July 3, 2007, 05:22

Hi to all,

I am a new openFoam user,and i would like to know if the perturbU utility exists by default in openFOam or i should add it?
can u please tell me how to get this utility?

thanks in advance
Hadi

alberto · July 3, 2007, 07:00

Hello,
it's not included in OpenFOAM. You can download it here:

- For a channel:

http://www.cfd-online.com/OpenFOAM_D...ages/1/40.html

- For a cylinder:

http://www.cfd-online.com/OpenFOAM_D...es/1/2946.html

With kind regards,
Alberto

hadi · July 3, 2007, 07:23

Thank you very much Alberto

regards
Hadi

pante · December 14, 2013, 13:44

hello,
I try to download perturbU utility for using it in a pipe flow, but for some reason I get a file of type .unk (unknown). Can anyone provide me a valid link for downloading perturbU utility?

wyldckat · December 14, 2013, 18:21

Greetings pante,

The old forum had this safety mechanism, where the attached files were renamed to always have the file extension ".unk".

The solution is simple: after you download the file, you have to manually rename the file extension to the correct extension, as indicated on the surrounding text for the link you used for the download. In this case, change "unk" to "tgz".

Best regards,
Bruno

Sunxing · March 10, 2014, 07:23

Quote:

Originally Posted by alberto

Hello,
it's not included in OpenFOAM. You can download it here:

- For a channel:

http://www.cfd-online.com/OpenFOAM_D...ages/1/40.html

With kind regards,
Alberto

Hi Alberto,

I'm using the perturbU utility to generate a terbulent initial filed for a wall-jet case. However, I don't know how to set the parameters in the perturbUDict, such as duplus, betaPlus, alphaPlus, sigma and epsilon. Is there a rule for setting them?
The following picture is the schematic of the domain for my case.

Best Regards.
sunxing

aylalisa · April 10, 2014, 10:01

Dear Sunxing,

did you read thesis of Eugene de Villiers:
"The Potential of Large Eddy Simulation for the Modeling of Wall Bounded Flows"
Page. 164 ff. and the the file perturbU.C till line 78.
It does not directly answer your question but could improve understanding.

Best regards,
aylalisa

Sunxing · April 10, 2014, 20:22

Quote:

Originally Posted by aylalisa

Dear Sunxing,

did you read thesis of Eugene de Villiers:
"The Potential of Large Eddy Simulation for the Modeling of Wall Bounded Flows"
Page. 164 ff. and the the file perturbU.C till line 78.
It does not directly answer your question but could improve understanding.

Best regards,
aylalisa

Hi aylalisa,

Thanks for your reply.

Regards
Sunxing

aylalisa · April 11, 2014, 04:16

Hi Sunxing,

I've found yesterday (after I've replied your thread): http://lists.cfd-online.com/pipermai...ch/019398.html

Aylalisa

Z.Q. Niu · May 7, 2014, 06:27

Hello aylalisa,
I has download purturbU from http://www.cfd-online.com/OpenFOAM_D...ages/1/40.html for channel.I wmake it in my open foam 2.2.0, but it points that "mathematicalConstant" is not declared. Do you wmake perturbU successfuly? would you mind sending me your file of perturbU? My email is silence@tju.edu.cn
Thank you !

amanbearpig · May 7, 2014, 14:45

I do not have version 2.2.0, but I encountered the same issue in 2.2.2. It's due to how pi is defined in different versions of OpenFOAM. Thankfully it is not a difficult fix.

If you edit the .C perturbU file and change any references (I believe there are 2) of 'mathematicalConstant' to 'constant::mathematical', this should rectify the issue.

Z.Q. Niu · May 7, 2014, 22:27

Thank you, amanbearpig! I have solved it ,the problem is indeed due to mathematicalConstant, I has corrected it successfully!

adambarfi · May 9, 2014, 01:27

here you are the modified perturbU utility for OF-2.0.0 to OF-2.3.0:

adambarfi · May 27, 2014, 03:50

hi everybody,

The perturbU utility was ran for channel395 correctly. I changed the geometry to a perfect channel which the conditions at inlet and outlet patches are cyclic. then I ran the perturbU but it set a zero velocity field for U. I can't understand why it didn't make any perturbation of my velocity field?????

anybody knows what and where is the problem?

the blockMeshDict is as follow:

Code:

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.1.0                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

convertToMeters 1;

vertices
(
    (0 0 0)
    (1 0 0)
    (1 1 0)
    (0 1 0)
    (0 0 4)
    (1 0 4)
    (1 1 4)
    (0 1 4)

    (2 0 0)
    (2 1 0)
    (2 0 4)
    (2 1 4)

    (1 2 0)
    (0 2 0)
    (1 2 4)
    (0 2 4)

    (2 2 0)
    (2 2 4)
);

blocks
(
    hex (0 1 2 3 4 5 6 7) (25 25 20) simpleGrading (10 10 1)
    hex (1 8 9 2 5 10 11 6) (25 25 20) simpleGrading (0.1 10 1)
    hex (3 2 12 13 7 6 14 15) (25 25 20) simpleGrading (10 0.1 1)
    hex (2 9 16 12 6 11 17 14) (25 25 20) simpleGrading (0.1 0.1 1)

);

edges
(
);

boundary
(
    outlet1_1
    {
        type cyclic;
        neighbourPatch  inlet1_1;
        faces
        (
            (4 7 6 5)
        );
    }
    inlet1_1
    {
        type cyclic;
        neighbourPatch  outlet1_1;
        faces
        (
            (0 3 2 1)
        );
    }


    outlet1_2
    {
        type cyclic;
        neighbourPatch inlet1_2;
        faces
        (
            (5 6 11 10)
        );
    }
    inlet1_2
    {
        type cyclic;
        neighbourPatch  outlet1_2;
        faces
        (
            (1 2 9 8)
        );
    }



    outlet2_1
    {
        type cyclic;
        neighbourPatch  inlet2_1;
        faces
        (
            (7 15 14 6)
        );
    }
    inlet2_1
    {
        type cyclic;
        neighbourPatch  outlet2_1;
        faces
        (
            (3 13 12 2)
        );
    }



    outlet2_2
    {
        type cyclic;
        neighbourPatch  inlet2_2;
        faces
        (
            (6 14 17 11)
        );
    }
    inlet2_2
    {
        type cyclic;
        neighbourPatch  outlet2_2;
        faces
        (
            (2 12 16 9)
        );
    }

    fixedWalls
    {
        type wall;
        faces
        (
            (4 7 3 0)
            (7 15 13 3)
            (10 11 9 8)
            (11 17 16 9)

            (4 0 1 5)
            (5 1 8 10)
            (15 13 12 14)
            (14 12 16 17)
        );
    }
);

mergePatchPairs
(
);

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

and the perturbUDict is as

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;
    instance        "system";

    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 2;

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

// Halfheight of channel. This is the direction normal to both streamwise and
// spanwise directions.
h 1;

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

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

// 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;


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

any tip or hint would be appreciated.

Regards,
Mostafa

adambarfi · May 27, 2014, 04:51

Quote:

Originally Posted by adambarfi

hi everybody,

The perturbU utility was ran for channel395 correctly. I changed the geometry to a perfect channel which the conditions at inlet and outlet patches are cyclic. then I ran the perturbU but it set a zero velocity field for U. I can't understand why it didn't make any perturbation of my velocity field?????

anybody knows what and where is the problem?

the blockMeshDict is as follow:

Code:

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.1.0                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

convertToMeters 1;

vertices
(
    (0 0 0)
    (1 0 0)
    (1 1 0)
    (0 1 0)
    (0 0 4)
    (1 0 4)
    (1 1 4)
    (0 1 4)

    (2 0 0)
    (2 1 0)
    (2 0 4)
    (2 1 4)

    (1 2 0)
    (0 2 0)
    (1 2 4)
    (0 2 4)

    (2 2 0)
    (2 2 4)
);

blocks
(
    hex (0 1 2 3 4 5 6 7) (25 25 20) simpleGrading (10 10 1)
    hex (1 8 9 2 5 10 11 6) (25 25 20) simpleGrading (0.1 10 1)
    hex (3 2 12 13 7 6 14 15) (25 25 20) simpleGrading (10 0.1 1)
    hex (2 9 16 12 6 11 17 14) (25 25 20) simpleGrading (0.1 0.1 1)

);

edges
(
);

boundary
(
    outlet1_1
    {
        type cyclic;
        neighbourPatch  inlet1_1;
        faces
        (
            (4 7 6 5)
        );
    }
    inlet1_1
    {
        type cyclic;
        neighbourPatch  outlet1_1;
        faces
        (
            (0 3 2 1)
        );
    }


    outlet1_2
    {
        type cyclic;
        neighbourPatch inlet1_2;
        faces
        (
            (5 6 11 10)
        );
    }
    inlet1_2
    {
        type cyclic;
        neighbourPatch  outlet1_2;
        faces
        (
            (1 2 9 8)
        );
    }



    outlet2_1
    {
        type cyclic;
        neighbourPatch  inlet2_1;
        faces
        (
            (7 15 14 6)
        );
    }
    inlet2_1
    {
        type cyclic;
        neighbourPatch  outlet2_1;
        faces
        (
            (3 13 12 2)
        );
    }



    outlet2_2
    {
        type cyclic;
        neighbourPatch  inlet2_2;
        faces
        (
            (6 14 17 11)
        );
    }
    inlet2_2
    {
        type cyclic;
        neighbourPatch  outlet2_2;
        faces
        (
            (2 12 16 9)
        );
    }

    fixedWalls
    {
        type wall;
        faces
        (
            (4 7 3 0)
            (7 15 13 3)
            (10 11 9 8)
            (11 17 16 9)

            (4 0 1 5)
            (5 1 8 10)
            (15 13 12 14)
            (14 12 16 17)
        );
    }
);

mergePatchPairs
(
);

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

and the perturbUDict is as

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;
    instance        "system";

    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 2;

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

// Halfheight of channel. This is the direction normal to both streamwise and
// spanwise directions.
h 1;

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

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

// 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;


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

any tip or hint would be appreciated.

Regards,
Mostafa

solved, I made a mistake and defined the Ubar=(0.1335 0 0) instead of Ubar=(0 0 0.1335).
sorry for that

Regards,
Mostafa

wyldckat · March 21, 2015, 13:34

Greetings to all!

I've given a proper wiki page and git repository to perturbU and all of the 3 variants I found that were made by Eugene de Villiers:

Wiki page: http://openfoamwiki.net/index.php/Contrib/perturbU
Repository: https://github.com/wyldckat/perturbU

May anyone feel free to update that wiki page and fork from that repository!

Best regards,
Bruno

canopus · June 1, 2015, 05:54

Hi!
I want to do LES of a diffuser.
For the inlet I want to run a precursor LES of channel for which I set cyclic for inlet and outlet.
Then I run perturbUChannel but the original 0/U file is replaced by some numbers.
Is it OK to run with this condition? How does the solver know about cyclic patches then?

aylalisa · June 1, 2015, 06:49

Hi Canopus,

yes, start simulation with the new field.

You define your patches in constant/polyMesh/blockMeshDict.

Quote:

boundary
(
inlet
{
type cyclic;
neighbourPatch outlet;
matchTolerance 0.01;
faces
(
(0 1 5 4)
);
}
...
)

Ayla

canopus · June 2, 2015, 07:31

Thanks for your reply.
I found that the numbers are the initial field and the boundary conditions of 0/U still exist and can be found in the bottom of the file.

syavash · October 8, 2015, 17:50

Dear Users,

I have problem compiling perturbU on OpenFOAM 2.3.1 and get the following error after running wmake all:

Code:

make[1]: Entering directory `/home/syavash/OpenFOAM/syavash-2.3.1/perturbU/perturbUChannel'
g++ -m64 -Dlinux64 -DWM_DP -Wall -Wextra -Wno-unused-parameter -Wold-style-cast -Wnon-virtual-dtor -O3  -DNoRepository -ftemplate-depth-100 -I/home/syavash/OpenFOAM/OpenFOAM-2.3.1/src/meshTools/lnInclude -I/home/syavash/OpenFOAM/OpenFOAM-2.3.1/src/finiteVolume/lnInclude  -IlnInclude -I. -I/home/syavash/OpenFOAM/OpenFOAM-2.3.1/src/OpenFOAM/lnInclude -I/home/syavash/OpenFOAM/OpenFOAM-2.3.1/src/OSspecific/POSIX/lnInclude   -fPIC -Xlinker --add-needed -Xlinker --no-as-needed Make/linux64GccDPOpt/perturbU.o -L/home/syavash/OpenFOAM/OpenFOAM-2.3.1/platforms/linux64GccDPOpt/lib \
         -lmeshTools -lfiniteVolume  -lOpenFOAM -ldl   -lm -o /home/syavash/OpenFOAM/syavash-2.3.1/platforms/linux64GccDPOpt/bin/perturbUChannel
make[1]: Leaving directory `/home/syavash/OpenFOAM/syavash-2.3.1/perturbU/perturbUChannel'
make[1]: Entering directory `/home/syavash/OpenFOAM/syavash-2.3.1/perturbU/perturbUCylinder'
g++ -m64 -Dlinux64 -DWM_DP -Wall -Wextra -Wno-unused-parameter -Wold-style-cast -Wnon-virtual-dtor -O3  -DNoRepository -ftemplate-depth-100 -I/home/syavash/OpenFOAM/OpenFOAM-2.3.1/src/meshTools/lnInclude -I/home/syavash/OpenFOAM/OpenFOAM-2.3.1/src/finiteVolume/lnInclude  -IlnInclude -I. -I/home/syavash/OpenFOAM/OpenFOAM-2.3.1/src/OpenFOAM/lnInclude -I/home/syavash/OpenFOAM/OpenFOAM-2.3.1/src/OSspecific/POSIX/lnInclude   -fPIC -Xlinker --add-needed -Xlinker --no-as-needed Make/linux64GccDPOpt/perturbU.o -L/home/syavash/OpenFOAM/OpenFOAM-2.3.1/platforms/linux64GccDPOpt/lib \
         -lmeshTools -lfiniteVolume  -lOpenFOAM -ldl   -lm -o /home/syavash/OpenFOAM/syavash-2.3.1/platforms/linux64GccDPOpt/bin/perturbUCylinder
make[1]: Leaving directory `/home/syavash/OpenFOAM/syavash-2.3.1/perturbU/perturbUCylinder'
make[1]: Entering directory `/home/syavash/OpenFOAM/syavash-2.3.1/perturbU/perturbUGeneric'
g++ -m64 -Dlinux64 -DWM_DP -Wall -Wextra -Wno-unused-parameter -Wold-style-cast -Wnon-virtual-dtor -O3  -DNoRepository -ftemplate-depth-100 -I/home/syavash/OpenFOAM/OpenFOAM-2.3.1/src/meshTools/lnInclude -I/home/syavash/OpenFOAM/OpenFOAM-2.3.1/src/finiteVolume/lnInclude  -IlnInclude -I. -I/home/syavash/OpenFOAM/OpenFOAM-2.3.1/src/OpenFOAM/lnInclude -I/home/syavash/OpenFOAM/OpenFOAM-2.3.1/src/OSspecific/POSIX/lnInclude   -fPIC -Xlinker --add-needed -Xlinker --no-as-needed Make/linux64GccDPOpt/perturbU.o -L/home/syavash/OpenFOAM/OpenFOAM-2.3.1/platforms/linux64GccDPOpt/lib \
         -lmeshTools -lfiniteVolume  -lOpenFOAM -ldl   -lm -o /home/syavash/OpenFOAM/syavash-2.3.1/platforms/linux64GccDPOpt/bin/perturbUGeneric
make[1]: Leaving directory `/home/syavash/OpenFOAM/syavash-2.3.1/perturbU/perturbUGeneric'

Could you help me to solve the problem??

Thanks,
Syavash

July 3, 2007, 05:22	Hi to all, I am a new openF	#1
hadi Member hadi tartoussi Join Date: Mar 2009 Location: paris Posts: 48 Rep Power: 17	Hi to all, I am a new openFoam user,and i would like to know if the perturbU utility exists by default in openFOam or i should add it? can u please tell me how to get this utility? thanks in advance Hadi hua1015 likes this.

July 3, 2007, 07:00	Hello, it's not included in O	#2
alberto Senior Member Alberto Passalacqua Join Date: Mar 2009 Location: Ames, Iowa, United States Posts: 1,912 Rep Power: 36	Hello, it's not included in OpenFOAM. You can download it here: - For a channel: http://www.cfd-online.com/OpenFOAM_D...ages/1/40.html - For a cylinder: http://www.cfd-online.com/OpenFOAM_D...es/1/2946.html With kind regards, Alberto songwukong, beatlejuice, jarpve and 1 others like this. __________________ Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats (current status: http://albertopassalacqua.com/?p=1541) OpenQBMM - An open-source implementation of quadrature-based moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using.

July 3, 2007, 07:23	Thank you very much Alberto	#3
hadi Member hadi tartoussi Join Date: Mar 2009 Location: paris Posts: 48 Rep Power: 17	Thank you very much Alberto regards Hadi

December 14, 2013, 18:21		#5
wyldckat Retired Super Moderator Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,975 Blog Entries: 45 Rep Power: 128	Greetings pante, The old forum had this safety mechanism, where the attached files were renamed to always have the file extension ".unk". The solution is simple: after you download the file, you have to manually rename the file extension to the correct extension, as indicated on the surrounding text for the link you used for the download. In this case, change "unk" to "tgz". Best regards, Bruno songwukong and gu1 like this. __________________ OpenFOAM: FAQ \| Getting started Forum: How to get help, to post code/output and forum guide Read this before sending me PM

April 10, 2014, 10:01		#7
aylalisa Senior Member Join Date: Nov 2012 Location: Bavaria Posts: 145 Rep Power: 13	Dear Sunxing, did you read thesis of Eugene de Villiers: "The Potential of Large Eddy Simulation for the Modeling of Wall Bounded Flows" Page. 164 ff. and the the file perturbU.C till line 78. It does not directly answer your question but could improve understanding. Best regards, aylalisa JamesCC and watermelon like this.

December 14, 2013, 13:44		#4
pante New Member Join Date: Feb 2013 Posts: 10 Rep Power: 13	hello, I try to download perturbU utility for using it in a pipe flow, but for some reason I get a file of type .unk (unknown). Can anyone provide me a valid link for downloading perturbU utility?

April 11, 2014, 04:16		#9
aylalisa Senior Member Join Date: Nov 2012 Location: Bavaria Posts: 145 Rep Power: 13	Hi Sunxing, I've found yesterday (after I've replied your thread): http://lists.cfd-online.com/pipermai...ch/019398.html Aylalisa

May 7, 2014, 06:27		#10
Z.Q. Niu Member Niu Join Date: Apr 2014 Posts: 55 Rep Power: 12	Hello aylalisa, I has download purturbU from http://www.cfd-online.com/OpenFOAM_D...ages/1/40.html for channel.I wmake it in my open foam 2.2.0, but it points that "mathematicalConstant" is not declared. Do you wmake perturbU successfuly? would you mind sending me your file of perturbU? My email is silence@tju.edu.cn Thank you !

May 7, 2014, 14:45		#11
amanbearpig Member Join Date: Apr 2011 Posts: 57 Rep Power: 15	I do not have version 2.2.0, but I encountered the same issue in 2.2.2. It's due to how pi is defined in different versions of OpenFOAM. Thankfully it is not a difficult fix. If you edit the .C perturbU file and change any references (I believe there are 2) of 'mathematicalConstant' to 'constant::mathematical', this should rectify the issue. songwukong likes this.

May 7, 2014, 22:27		#12
Z.Q. Niu Member Niu Join Date: Apr 2014 Posts: 55 Rep Power: 12	Thank you, amanbearpig! I have solved it ,the problem is indeed due to mathematicalConstant, I has corrected it successfully!

March 21, 2015, 13:34		#16
wyldckat Retired Super Moderator Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,975 Blog Entries: 45 Rep Power: 128	Greetings to all! I've given a proper wiki page and git repository to perturbU and all of the 3 variants I found that were made by Eugene de Villiers: Wiki page: http://openfoamwiki.net/index.php/Contrib/perturbU Repository: https://github.com/wyldckat/perturbU May anyone feel free to update that wiki page and fork from that repository! Best regards, Bruno songwukong and rt08 like this.

June 1, 2015, 05:54	perturbU + precursor inlet	#17
canopus Member SM Join Date: Dec 2010 Posts: 97 Rep Power: 15	Hi! I want to do LES of a diffuser. For the inlet I want to run a precursor LES of channel for which I set cyclic for inlet and outlet. Then I run perturbUChannel but the original 0/U file is replaced by some numbers. Is it OK to run with this condition? How does the solver know about cyclic patches then?

June 2, 2015, 07:31		#19
canopus Member SM Join Date: Dec 2010 Posts: 97 Rep Power: 15	Thanks for your reply. I found that the numbers are the initial field and the boundary conditions of 0/U still exist and can be found in the bottom of the file.

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