SnappyHexMesh& extrudeMesh

immortality · June 2, 2013, 17:02

another error occurred in performing extrudeMesh,I changed that address also:

Code:

ehsan@Ehsan-com:~/Desktop/Files/airfoil_simpleFoam_modified$ extrudeMesh
/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.2.0                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : 2.2.0-b363e8d14789
Exec   : extrudeMesh
Date   : Jun 03 2013
Time   : 01:26:22
Host   : "Ehsan-com"
PID    : 3143
Case   : /home/ehsan/Desktop/Files/airfoil_simpleFoam_modified
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

Selecting extrudeModel linearNormal
Extruding from patch using model linearNormal
Collapsing edges < 0.0001 of bounding box

Extruding patches 1(front) on mesh "../aifoil_snappyHexMesh_modified2"



--> FOAM FATAL IO ERROR: 
cannot find file

file: ../aifoil_snappyHexMesh_modified2/system/controlDict at line 0.

    From function regIOobject::readStream()
    in file db/regIOobject/regIOobjectRead.C at line 73.

FOAM exiting

-------
I'll continue tomorrow,bye for now

s.m · June 2, 2013, 17:08

Quote:

Originally Posted by immortality

another error occurred in performing extrudeMesh,I changed that address also:

Code:

ehsan@Ehsan-com:~/Desktop/Files/airfoil_simpleFoam_modified$ extrudeMesh
/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.2.0                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : 2.2.0-b363e8d14789
Exec   : extrudeMesh
Date   : Jun 03 2013
Time   : 01:26:22
Host   : "Ehsan-com"
PID    : 3143
Case   : /home/ehsan/Desktop/Files/airfoil_simpleFoam_modified
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

Selecting extrudeModel linearNormal
Extruding from patch using model linearNormal
Collapsing edges < 0.0001 of bounding box

Extruding patches 1(front) on mesh "../aifoil_snappyHexMesh_modified2"



--> FOAM FATAL IO ERROR: 
cannot find file

file: ../aifoil_snappyHexMesh_modified2/system/controlDict at line 0.

    From function regIOobject::readStream()
    in file db/regIOobject/regIOobjectRead.C at line 73.

FOAM exiting

-------
I'll continue tomorrow,bye for now

Dear ehsan, these two folders "airfoil_snappyHexMesh_modified2" and "simpleFoam_simpleFoam_modified" should be in on folder beside each other.
thanks

immortality · June 2, 2013, 17:26

yes they are in a unique folder beside to each other.
maybe this line have any problem?

Code:

sourceCase "../aifoil_snappyHexMesh_modified2";

is it right? it doen't find controlDict.

s.m · June 3, 2013, 01:55

Quote:

Originally Posted by immortality

yes they are in a unique folder beside to each other.
maybe this line have any problem?

Code:

sourceCase "../aifoil_snappyHexMesh_modified2";

is it right? it doen't find controlDict.

after finishig the analysis in airfoil_snappyHexMesh you now have "1,2,3,4" folders, yes?
now go to the airfoil_simpleFoam and write the name of the folder that you run the snappyHexMesh in it that is contain of "1,2,3,4" folders.
after this come to airfoil_simpleFoam that is contain "0,constant,system" and run extrudeMesh, and simpleFoam at the end.

s.m · June 3, 2013, 01:58

Quote:

Originally Posted by nimasam

dear saide
check which side of 3D body, are you going to extrude?
are both sides (front and back) are the same?

Dear Nima i have extruded the front face, would you please take look at extrudeMeshDict in the attachment?

s.m · June 3, 2013, 02:08

Quote:

Originally Posted by s.m

Dear ehsan, these two folders "airfoil_snappyHexMesh_modified2" and "simpleFoam_simpleFoam_modified" should be in on folder beside each other.
thanks

this error is because of you run the extrudeMesh in a wrong folder. you should go to the airfoil_simpleFoam then run the extrudeMesh there to give you polyMesh, in the constant folder of it.

immortality · June 3, 2013, 03:29

Hi Saideh
I run the command in true folder but there are only "1,2,3" folders in airfoil_snappyHexMesh_modified2.
which version are you using?
there is an error on snapEdge:

Code:

ehsan@Ehsan-com:~/Desktop/Files/airfoil_snappyHexMesh_modified2$ snapEdge
snapEdge: command not found

what does do this command?

nimasam · June 3, 2013, 05:14

Quote:

Originally Posted by s.m

Dear Nima i have extruded the front face, would you please take look at extrudeMeshDict in the attachment?

your extrudeMeshDict are completely right

, did you check your mesh before extrusion? check whether it is front and back are the same

s.m · June 3, 2013, 07:57

Quote:

Originally Posted by immortality

Hi Saideh
I run the command in true folder but there are only "1,2,3" folders in airfoil_snappyHexMesh_modified2.
which version are you using?
there is an error on snapEdge:

Code:

ehsan@Ehsan-com:~/Desktop/Files/airfoil_snappyHexMesh_modified2$ snapEdge
snapEdge: command not found

what does do this command?

openFoam does not have snapEdge dictionary you should compile it to your openFoam before running the snapEdge in the terminal.
it doesn't necessary for this multi element airfoil. run snappyHexMesh without the snapEdge. so it should create 3 folders for you.

s.m · June 3, 2013, 08:00

Quote:

Originally Posted by nimasam

your extrudeMeshDict are completely right

, did you check your mesh before extrusion? check whether it is front and back are the same

yes i check the mesh, after finishing the SHM. the picture that i put in the 1th post is before layering , after layering and after extrudeMesh.
would you please take a look on my snappHexMesh file?

immortality · June 3, 2013, 10:05

how to compile snapEdge?
now its running for 30 minutes.
the problem is on the values?
how is the order of coefficients?flap,main,slat from above to bottom?
what is Cl(f) and Cl(r)?

Code:

Cm    = 0.377331
    Cd    = 0.165487
    Cl    = 0.234554
    Cl(f) = 0.494607
    Cl(r) = -0.260054

nimasam · June 3, 2013, 13:36

Quote:

Originally Posted by s.m

yes i check the mesh, after finishing the SHM. the picture that i put in the 1th post is before layering , after layering and after extrudeMesh.
would you please take a look on my snappHexMesh file?

1- i know there is difference in mesh shape before and after extrusion

you insist on it several times

, my question was whether front and back face before extrusion after snappyHexMesh have the same shape

still waiting for your response

2- your snappyHexMesh is fine enough

s.m · June 4, 2013, 01:27

Quote:

Originally Posted by nimasam

1- i know there is difference in mesh shape before and after extrusion

you insist on it several times

, my question was whether front and back face before extrusion after snappyHexMesh have the same shape

still waiting for your response

2- your snappyHexMesh is fine enough

of course they have the same shape, i attach some picture from front and back views of my snappyHexMesh

s.m · June 4, 2013, 01:52

Quote:

Originally Posted by immortality

how to compile snapEdge?
now its running for 30 minutes.
the problem is on the values?
how is the order of coefficients?flap,main,slat from above to bottom?
what is Cl(f) and Cl(r)?

Code:

Cm    = 0.377331
    Cd    = 0.165487
    Cl    = 0.234554
    Cl(f) = 0.494607
    Cl(r) = -0.260054

i write three function for three element separately, so you should get three group result for "cd, cl and cm" as i know the cl for main element should reach 2.44, and 0.24 for flap.

nimasam · June 4, 2013, 05:14

Quote:

Originally Posted by s.m

of course they have the same shape, i attach some picture from front and back views of my snappyHexMesh

i have no more clue

in my mind, be lucky in your simulation,
if you stick in simulation with free software, maybe you want to use other free software such as salome, netgen, gmsh and like that for your simulation

and import it to OpenFOAM

s.m · June 4, 2013, 05:41

Quote:

Originally Posted by nimasam

i have no more clue

in my mind, be lucky in your simulation,
if you stick in simulation with free software, maybe you want to use other free software such as salome, netgen, gmsh and like that for your simulation

and import it to OpenFOAM

you mean what is happen after running extrudeMesh is because of my mesh?

nimasam · June 4, 2013, 05:48

Quote:

Originally Posted by s.m

you mean what is happen after running extrudeMesh is because of my mesh?

i mean that you can create your mesh some where else

with less sophisticated problem

but now, i remember, maybe there is another clue

before, extrude Mesh use following command:

Quote:

flattenMesh

check whether it helps or not

Dadou · January 29, 2014, 01:53

Quote:

Originally Posted by immortality

dear Saideh in doing this command:

Code:

surfaceFeatureExtract -includedAngle 150 -writeObj constant/triSurface/airfoil.stl airfoil

this error displayed:

Code:

Create time

Reading surfaceFeatureExtractDict



--> FOAM FATAL IO ERROR: 
cannot open file

file: /home/ehsan/Desktop/airfoil_snappyHexMesh_modified/system/surfaceFeatureExtractDict at line 0.

    From function regIOobject::readStream()
    in file db/regIOobject/regIOobjectRead.C at line 87.

FOAM exiting

ehsan@Ehsan-com:~/Desktop/airfoil_snappyHexMesh_modified$ surfaceFeatureExtract -includedAngle 150 -writeObj constant/triSurface/airfoil.stl airfoil

Usage: surfaceFeatureExtract [OPTIONS]
options:
  -case <dir>       specify alternate case directory, default is the cwd
  -dict <file>      read control dictionary from specified location
  -noFunctionObjects
                    do not execute functionObjects
  -srcDoc           display source code in browser
  -doc              display application documentation in browser
  -help             print the usage

extract and write surface features to file

Using: OpenFOAM-2.2.0 (see www.OpenFOAM.org)
Build: 2.2.0-b363e8d14789



--> FOAM FATAL ERROR: 
Wrong number of arguments, expected 0 found 3
Invalid option: -writeObj
Invalid option: -includedAngle


FOAM exiting

I'm totally unfamiliar with snappyHexMesh commands if I have run it mistakenly.

Hello,

Did you solve this problem? Because I have the same problem and I can't solve it. I tried to look it up in the forum but nothing new or really helpfull.

Thank you

Dadou

nimasam · January 29, 2014, 02:30

well, you may want to add surfaceFeatureExtractDict to your system folder, and edit it appropriately

Dadou · January 29, 2014, 03:14

Quote:

Originally Posted by nimasam

well, you may want to add surfaceFeatureExtractDict to your system folder, and edit it appropriately

Thank you

Regards,

June 2, 2013, 17:26		#23
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 26	yes they are in a unique folder beside to each other. maybe this line have any problem? Code: sourceCase "../aifoil_snappyHexMesh_modified2"; is it right? it doen't find controlDict. __________________ Injustice Anywhere is a Threat for Justice Everywhere.Martin Luther King. To Be or Not To Be,Thats the Question! The Only Stupid Question Is the One that Goes Unasked.

June 3, 2013, 03:29		#27
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 26	Hi Saideh I run the command in true folder but there are only "1,2,3" folders in airfoil_snappyHexMesh_modified2. which version are you using? there is an error on snapEdge: Code: ehsan@Ehsan-com:~/Desktop/Files/airfoil_snappyHexMesh_modified2$ snapEdge snapEdge: command not found what does do this command? __________________ Injustice Anywhere is a Threat for Justice Everywhere.Martin Luther King. To Be or Not To Be,Thats the Question! The Only Stupid Question Is the One that Goes Unasked.

June 3, 2013, 10:05		#31
immortality Senior Member Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,208 Rep Power: 26	how to compile snapEdge? now its running for 30 minutes. the problem is on the values? how is the order of coefficients?flap,main,slat from above to bottom? what is Cl(f) and Cl(r)? Code: Cm = 0.377331 Cd = 0.165487 Cl = 0.234554 Cl(f) = 0.494607 Cl(r) = -0.260054 __________________ Injustice Anywhere is a Threat for Justice Everywhere.Martin Luther King. To Be or Not To Be,Thats the Question! The Only Stupid Question Is the One that Goes Unasked.

January 29, 2014, 02:30		#39
nimasam Senior Member Nima Samkhaniani Join Date: Sep 2009 Location: Tehran, Iran Posts: 1,266 Blog Entries: 1 Rep Power: 24	well, you may want to add surfaceFeatureExtractDict to your system folder, and edit it appropriately __________________ My Personal Website (http://nimasamkhaniani.ir/) Telegram channel (https://t.me/cfd_foam)

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