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Old   November 6, 2010, 12:03
Default Issues with mapFields
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Austin French
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Hi all.

I'm trying to use the mapFields utility to go from a coarser mesh to a finer one. I'm interested in refining the mesh around a body and have been using refinement regions in snappyHexMesh. The surface refinement on the body isn't changing at all, so the body meshes should be ~identical.

After solving my coarser mesh to 1000 steps, I run the mapFields two different ways and get two different problems.

Using -consistent, I get a target folder at the correct time in my new finer mesh. The interpolation has some issues but seemingly not near regions that are newly refined. Namely, I get small regions decreasing velocity to 0, which isn't ideal, but I think running the solution should get rid of them. The problem is I also get negative values of omega at those regions. This trips the bounding omega in the log file when I try to solve and the solver crashes. The error message has a lot about turbulence models and FPE's but I certainly don't find it particularly helpful.

Using the mapFieldDict method, I get the following output.

Code:
xxx@XXX-linux:~/OpenFOAM/xxx-1.7.1/run/domain_1b$ mapFields ../domain_1a
/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  1.7.1                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : 1.7.1-320803922ee1
Exec   : mapFields ../domain_1a
Date   : Nov 07 2010
Time   : 01:30:07
Host   : XXX-linux
PID    : 13179
Case   : /home/xxx/OpenFOAM/xxx-1.7.1/run/domain_1b
nProcs : 1
SigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Source: ".." "domain_1a"
Target: "/home/xxx/OpenFOAM/xxx-1.7.1/run" "domain_1b"

Create databases as time

Source time: 1000
Target time: 1000
Create meshes

Source mesh size: 1130080    Target mesh size: 1824109


Mapping fields for time 1000


End
Again the times line up, and the meshes are correct. But the fields aren't interpolated at all and I do not get a new folder for time = 1000. I think it might be my mapFieldDict file, but I've followed the advice of other threads and the OpenFOAM manual.

Code:
/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  1.7.0                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "system";
    object      mapFieldsDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

patchMap        
(
    inboard inboard
    outboard outboard
    inlet inlet
    outlet outlet
    bottomAndTop bottomAndTop    
    hull_BL_A_O hull_BL_A_O
);

cuttingPatches  
(
    
);


// ************************************************************************* //
The mapFieldsDict method runs through all the interpolate fields if I have already run -consistent, but the second interpolation doesn't change the values at all. I'm using OpenFoam 1.7.1 which doesn't require a target field as was noted in at least one other thread and attempting to put one in gives an argument error as expected.

So, I'm not entirely sure what to do. Obviously, not having to solve the whole 1.8mil mesh would be nice since its just a mesh refinement. I'm finding this problem is intermittent. Sometimes I am able to use -consistent and don't get the negative omega values. It varies with the mesh refinement that I am starting with and what I add to it. Which is all very frustrating.
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Old   January 13, 2011, 06:09
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Matthias Voß
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hi,

i am having the same problem. mapFields running without error but also without creating something.

Did you found a solution?
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Old   January 16, 2011, 14:12
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Usit McCarra
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In my case it works executing:

mapFields directory_example/case_directory -sourceTime latestTime

I left patchMap and cuttingPatches subDicts blank in the mapFieldsDict, but I created beforehand the temporal directory.

Have a look at your time directory named "100" (latest time) because it should exist. Your simulation should reach the latest time to map the results and write it. If it is not created check the writing interval in controlDict.

In my case the mesh size is the same but the geometry is different because it is a dynamic mesh problem. I have not tried with meshes of other sizes.
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Old   February 12, 2011, 15:24
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Hi
Is it possible to map all the time directories of a case, to another one?!
I mean map data from directories 0, 0.01, 0.02, 0.03, ..... of case 1 into directories 0, 0.01, 0.02, 0.03, ..... of case 2, all with one command?!!
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Old   April 12, 2011, 14:07
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Mark Beal
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Did you ever solve this? I'm having exactly the same problem. If I use -consistent I get negative omega values and my solver gives up, if I use mapFieldsDict (with blank entries) I don't get an output.

I'm trying to map between a coarse and a medium mesh where the mesh density has only been changed by upping the values in blockMeshDict before running snappyHexMesh.

I've tried:

Code:
mapFields ../Coarse -consistent
(negative values and solver problems)
Code:
mapFields ../Coarse -sourceTime 10
(no output, "10" is the last time step)
Code:
mapFields ../Coarse -sourceTime 0
(nothing)
Code:
mapFields ../Coarse -sourceTime latestTime
(nothing)

For each of the the cases I get a similar shell output of

Code:
Build  : 1.7.x-131caa989cd3
Exec   : mapFields ../Coarse -sourceTime latestTime
Date   : Apr 12 2011
Time   : 18:01:07
Host   : msbealo-desk
PID    : 7678
Case   : /home/msbealo/OpenFOAM/msbealo-1.7.1/run/Medium
nProcs : 1
SigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Source: ".." "Coarse"
Target: "/home/msbealo/OpenFOAM/msbealo-1.7.1/run/" "Medium"

Create databases as time

Source time: 10
Target time: 10
Create meshes

Source mesh size: 274765    Target mesh size: 495044


Mapping fields for time 10


End
My mapFieldsDict looks like:

Code:
patchMap ( );

cuttingPatches  ( );
I've also tried explicitly stating which patches to copy using (inlet inlet etc) with not change.

Any help please? I know it's probably something pretty silly.

Mark
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Old   April 12, 2011, 15:26
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maybe mapFields is not able to interpolate between meshes of different sizes. I'll try to figure it out.
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Old   April 13, 2011, 09:14
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Hi

I think you should make a temporary folder in the case and initial files of fields you want to map should be there.
For example:
if you want to map field omega from time 5 of coarse mesh to omega field from time 5 of fine mesh you should:

1- make a directory of time 5 in fine mesh case.
2- in that folder you should have a dictionary of omega that indicate boundary conditions ( the same as dictionary that you write in your 0 dictionary)
3-In your controlDict of case fine, change startTime to 5.
4- run the command "mapFields ../Coarse"

It will map field omega from folder 5 of case coarse to folder 5 of case fine.

Thats it!
Mohammadreza
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Old   April 13, 2011, 09:58
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Mohammadreza

Thanks! That seems to be working. I'm currently running something in the background so I can't test it fully but it does run using your suggestions.

Regards,

Mark
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Old   June 10, 2011, 11:24
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Yes, it seems mapFields works (only) when the source time and target time are the same.
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Old   February 10, 2012, 12:18
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Quote:
Originally Posted by BlackBoatNavArch View Post
Using -consistent, I get a target folder at the correct time in my new finer mesh. The interpolation has some issues but seemingly not near regions that are newly refined. Namely, I get small regions decreasing velocity to 0, which isn't ideal, but I think running the solution should get rid of them.
Did you figure out the problem ?

I have exactly the same issue, I have many regions where mapFields attributes 0 values which is really bad... I guess it's a question of interpolation, but did anybody find a solution ?
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Old   February 14, 2012, 09:22
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No one found why mapFields outputs 0 values ?
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Old   February 14, 2012, 13:52
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ic3wall,

For me, I followed Mohammadreza advise (above) and it works fine. I guess the obvious question is are you mapping the right time directory from the source to the target? You're not mapping the '0' folder?

Make sure your target controlDict has the startTime of the last time of the source case. So, if you ran the first simulation to 10 seconds and then want to map this to the next case, copy the '0' time to '10' (to set up the right files), change the startTime to 10 in the target case and run mapFields.

Post the output of mapFields if you still get something strange.

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Old   February 14, 2012, 15:58
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Quote:
Originally Posted by Opxah View Post
Yes, it seems mapFields works (only) when the source time and target time are the same.
You can map inconsistent geometry as is documented in the user manual, which is what cuttingPatches and mappingPatches entries are for. When the new mesh is within the domain of the old one you still have values from which you can map fields and patches (the cavity tutorials in the manual show this clearly), but if your new domain has parts that are outside your old domain, then the default value mapFields gives those regions is 0.

I've experienced stability issues when refining meshes and wrote a utility to deal with it. The basic algorithm is:

1) Create a field with uniform value 1 in the mesh you want map FROM, call it "mark" or something
2) Create a field with uniform value -1 in the mesh you want to map TO, with the same name ("mark" in this general example)
3) Do your mapping inconsistently, and now
4) Now run through the the new "mark field", and whenever you find a cell (I restricted myself to cells) that has mark == -1, you should replace all field values (U, T, etc) for that cell with interpolations from valid nearby cells (those whose value of "mark" is 1)

How you do the interpolation is up to you. Because the differences in geometry are so small in our case, we just directly copied valid field values. If the differences are larger you should do some kind of weighted interpolation.
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Old   February 14, 2012, 16:14
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Quote:
Originally Posted by mturcios777 View Post
You can map inconsistent geometry as is documented in the user manual, which is what cuttingPatches and mappingPatches entries are for. When the new mesh is within the domain of the old one you still have values from which you can map fields and patches (the cavity tutorials in the manual show this clearly), but if your new domain has parts that are outside your old domain, then the default value mapFields gives those regions is 0.

I've experienced stability issues when refining meshes and wrote a utility to deal with it. The basic algorithm is:

1) Create a field with uniform value 1 in the mesh you want map FROM, call it "mark" or something
2) Create a field with uniform value -1 in the mesh you want to map TO, with the same name ("mark" in this general example)
3) Do your mapping inconsistently, and now
4) Now run through the the new "mark field", and whenever you find a cell (I restricted myself to cells) that has mark == -1, you should replace all field values (U, T, etc) for that cell with interpolations from valid nearby cells (those whose value of "mark" is 1)

How you do the interpolation is up to you. Because the differences in geometry are so small in our case, we just directly copied valid field values. If the differences are larger you should do some kind of weighted interpolation.
I'm mapping values from a very large field on a smaller one (which is envoloped by the bigger one) with a different mesh resolution. It is an inconsistent mapping. The zero values are scattered in the new field, this is the weird thing. The new mapped field looks like a checkerboard.

I'll try to post a picture.
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Old   February 15, 2012, 10:20
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Here it goes, the first picture is the large field and the second one is the result of the mapping on the smaller one. The yellow rectangle in the first picture shows the smaller domain on which I'm mapping.

As you can see on the second picture, there are several zero values scattered everywhere.

Here's a part of the nonuniform List output that corresponds to the mapped field:

25921
(
0.5
0.5
0.25
0
0
0.5
0
0.5
0
0
0
0.5
0.5
0
0.5
0.5
0.5
0.25
0
0.5
0.5
0.5
0
0
0.39767
0
0
0.0518247
0.00227012
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0.137366
0.248451
0
0
0.488571
...)
Attached Images
File Type: jpg large.jpg (92.7 KB, 400 views)
File Type: jpg small.jpg (57.0 KB, 377 views)
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Old   February 15, 2012, 15:22
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Problem found!

I was using mapFieldsDict incorrectly, both patches I wanted to map are coincident, so they had to be included in PatchMap(...). CuttingPatches had to be empty.

Basically I was mapping internal fields onto a surface ... which is not I what I wanted.

Thank you for your help!
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Old   May 24, 2013, 10:46
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Hello all,

I will use this thread to ask another issue with mapFields.

I am using the results from a URANS simulation as initial values for LES. I use mapFields utility for this. Consisten flag on as the geometry and boundary conditions are the same.

1) If I use mapFields with ---> source: Coarse mesh, target: Fine mesh
I get he values that make no sense (Zero pressure, negative k and omega, 1000 velocity...)

2) If I use mapFields with ---> source: Fine mesh, target: Coarse mesh.
Then it works fine!

Can anybody explain me why?? Is is a bug?
I need to use the data from the URANS simulation for LES. Is there any other way I can do it without using mapFields?

Thanks a lot =)
Any idea / comment will be more than welcome
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Old   May 24, 2013, 11:57
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Always I am using mapFields everything is working

Code:
 
mapFields -sourceTime latestTime -case ../coarseMeshSimulationName/
The entries in the mapFieldsDict are empty.!

Works perfekt all the time.
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Old   May 24, 2013, 14:27
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Happy to know that it works perfectly for you.

But mine is just so crap at some cells as you can see on the pic
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Old   April 10, 2014, 02:15
Default Plane normal defined with zero length
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Hi all,

I am having some problem in using the mapFields utility.
When I map from coarse to fine mesh the utility works fine and gives me a clean result.
However on trying to go from one level of refinement (region refinement using SHM) in one mesh to another level of refinement (refinement close to an imported STL file in SHM) in another mesh mapfields creates problems

Here is when I face the problem:-

I refine a region of my mesh and run my solver. Next I create a different coarse mesh with an STL file in the region of the previous refinement (using shm) and try mapping the results from the latest time of my refined mesh to the coarse mesh. This gives me the following error. I have posted the gdb output here. Please note that the points mentioned in the error output are not near the new STL file.
Code:
(gdb) r ../frac1 -sourceTime 'latestTime'
Starting program: /opt/OpenFOAM/OpenFOAM-2.3.x/platforms/linux64GccDPOpt/bin/mapFields ../frac1 -sourceTime 'latestTime'
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.3.x                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : 2.3.x-e0d5f5a218ab
Exec   : /opt/OpenFOAM/OpenFOAM-2.3.x/platforms/linux64GccDPOpt/bin/mapFields ../frac1 -sourceTime latestTime
Date   : Apr 10 2014
Time   : 00:05:53
Host   : "ubuntu"
PID    : 9303
Case   : /home/ripuvm/OpenFOAM/ripuvm-2.3.x/multiFrac/cases/Consecutive1Well/frac2
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

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Source: ".." "frac1"
Target: "/home/ripuvm/OpenFOAM/ripuvm-2.3.x/multiFrac/cases/Consecutive1Well" "frac2"

Create databases as time
Case   : ../frac1
nProcs : 1

Source time: 133
Target time: 54

Create meshes

Source mesh size: 68670    Target mesh size: 83482


Creating and mapping fields for time 133

Creating mesh-to-mesh addressing for region0 and region0 regions using cellVolumeWeight


--> FOAM FATAL ERROR: 
Plane normal defined with zero length
Bad points:(15.24 -114.3 -22.86) (15.24 -106.68 -22.86) (15.24 -99.06 -22.86)

    From function void plane::calcPntAndVec
(
    const point&,
    const point&,
    const point&
)

    in file meshes/primitiveShapes/plane/plane.C at line 116.

FOAM aborting

#0  Foam::error::printStack(Foam::Ostream&) in "/opt/OpenFOAM/OpenFOAM-2.3.x/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#1  Foam::error::abort() in "/opt/OpenFOAM/OpenFOAM-2.3.x/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#2  Foam::plane::calcPntAndVec(Foam::Vector<double> const&, Foam::Vector<double> const&, Foam::Vector<double> const&) in "/opt/OpenFOAM/OpenFOAM-2.3.x/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#3  Foam::tetOverlapVolume::tetTetOverlapVol(Foam::tetPoints const&, Foam::tetPoints const&) const in "/opt/OpenFOAM/OpenFOAM-2.3.x/platforms/linux64GccDPOpt/lib/libmeshTools.so"
#4  Foam::tetOverlapVolume::cellCellOverlapVolumeMinDecomp(Foam::primitiveMesh const&, int, Foam::primitiveMesh const&, int, Foam::treeBoundBox const&) const in "/opt/OpenFOAM/OpenFOAM-2.3.x/platforms/linux64GccDPOpt/lib/libmeshTools.so"
#5  Foam::meshToMeshMethod::interVol(int, int) const in "/opt/OpenFOAM/OpenFOAM-2.3.x/platforms/linux64GccDPOpt/lib/libsampling.so"
#6  Foam::cellVolumeWeightMethod::calculateAddressing(Foam::List<Foam::List<int> >&, Foam::List<Foam::List<double> >&, Foam::List<Foam::List<int> >&, Foam::List<Foam::List<double> >&, int, int, Foam::List<int> const&, Foam::List<bool>&, int&) in "/opt/OpenFOAM/OpenFOAM-2.3.x/platforms/linux64GccDPOpt/lib/libsampling.so"
#7  Foam::cellVolumeWeightMethod::calculate(Foam::List<Foam::List<int> >&, Foam::List<Foam::List<double> >&, Foam::List<Foam::List<int> >&, Foam::List<Foam::List<double> >&) in "/opt/OpenFOAM/OpenFOAM-2.3.x/platforms/linux64GccDPOpt/lib/libsampling.so"
#8  Foam::meshToMesh::calcAddressing(Foam::polyMesh const&, Foam::polyMesh const&) in "/opt/OpenFOAM/OpenFOAM-2.3.x/platforms/linux64GccDPOpt/lib/libsampling.so"
#9  Foam::meshToMesh::calculate() in "/opt/OpenFOAM/OpenFOAM-2.3.x/platforms/linux64GccDPOpt/lib/libsampling.so"
#10  Foam::meshToMesh::meshToMesh(Foam::polyMesh const&, Foam::polyMesh const&, Foam::meshToMesh::interpolationMethod const&, Foam::HashTable<Foam::word, Foam::word, Foam::string::hash> const&, Foam::List<Foam::word> const&) in "/opt/OpenFOAM/OpenFOAM-2.3.x/platforms/linux64GccDPOpt/lib/libsampling.so"
#11  
 in "/opt/OpenFOAM/OpenFOAM-2.3.x/platforms/linux64GccDPOpt/bin/mapFields"
#12  
 in "/opt/OpenFOAM/OpenFOAM-2.3.x/platforms/linux64GccDPOpt/bin/mapFields"
#13  __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#14  
 in "/opt/OpenFOAM/OpenFOAM-2.3.x/platforms/linux64GccDPOpt/bin/mapFields"

Program received signal SIGABRT, Aborted.
0x00007ffff4260425 in raise () from /lib/x86_64-linux-gnu/libc.so.6
Any help will be highly appreciated.

Thank you.
Regards,
Ripu
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