[balav94]

Hi everyone!

I am new to Openfoam and trying to run some tutorials. One such tutorial is this-

https://github.com/OpenFOAM/OpenFOAM...nWithObstacles

I am not able to understand the README file provided, as I am not able to figure out the functions necessary to run the case.

PDR test case Step to introduce the PDR fields: 1) Create zero-size patches for wall or/and coupled baffles in the boundary file. 2) Specify the boundary contitions for these patches in the fields. 3) Create the new PDR mesh using the PDRMesh utility.

It would be great if someone can help me run this tutorial.

Thanks!

[khedar]

Try reading the README along with the Allrun script which might help. Normally running allrun script is all you need to run a case and hence you can figure it out what steps you need to follow for running a case

runApplication blockMesh
runApplication changeDictionary
runApplication topoSet

runApplication PDRMesh -overwrite

1. blockmesh creates the mesh (Step 1 of readme probably?)
2. changeDictionary specifies the boundary conditions (Step 2)
3. PDRMesh with over write option will create PDR mesh and overwrite the existing mesh(Step 3)

[balav94]

Hi Khedar!

I am currently having issues with my system. I will try this and get back to you.

However, I did read the Allrun script. I was facing some error in the changeDictionary step. I will post the error once I try it out, in 2-3 days

Thanks!

[balav94]

Hi Khedar!

When I run the 'changeDictionary' command, I get the following error. Can you help me out?

balavignesh@bumblebee:~/OpenFOAM/balavignesh-4.1/run/flamePropagationWithObstacles$ changeDictionary
/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 4.1 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
Build : 4.1-1e03d68d4f4e
Exec : changeDictionary
Date : Nov 14 2016
Time : 14:52:26
Host : "bumblebee"
PID : 10607
Case : /home/balavignesh/OpenFOAM/balavignesh-4.1/run/flamePropagationWithObstacles
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster
allowSystemOperations : Allowing user-supplied system call operations

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

Create mesh for time = 0

Read dictionary changeDictionaryDict with replacements for dictionaries 1(dictionaryReplacement)
Reading polyMesh/boundary file to extract patch names
Loaded dictionary boundary with entries
6
(
outer
ground
blockedFaces
baffleWall
baffleCyclic_half0
baffleCyclic_half1
)

Extracted patch groups:
group cyclic with patches
2
(
baffleCyclic_half0
baffleCyclic_half1
)

group wall with patches
3
(
ground
blockedFaces
baffleWall
)

Replacing entries in dictionary dictionaryReplacement
Loading dictionary dictionaryReplacement


--> FOAM FATAL IO ERROR:
cannot find file

file: /home/balavignesh/OpenFOAM/balavignesh-4.1/run/flamePropagationWithObstacles/0/dictionaryReplacement at line 0.

From function regIOobject::readStream()
in file db/regIOobject/regIOobjectRead.C at line 72.

FOAM exiting

[khedar]

It seems there is no dictionaryReplacement file at the specified Location..

Edited:After trying the tutorial myself.
I tried running the case with Allrun script and it ran fine, without any problem.

Then i tried all functions individually and again it worked fine. Don't forget to rename 0.org to 0 before running anything.

cp -r 0.orig 0
blockMesh
changeDictionary
topoSet
PDRMesh -overwrite

PDRFoam

[balav94]

Hey Khedar!

I tried it again. This time, I manually replaced the boundary conditions & associated values instead of using 'changeDictionary'. It worked. However, I got the same error when I ran the 'changeDictionary' function.

But, once I load the solution into ParaView, I am not able to see which is the obstacle past which the flame is propagating and what the domain is, in this problem. Were you able to? If yes, can you explain me?

Thanks anyways!

[balav94]

Hi Khedar!

I successfully managed to setup my case using XiFoam. However, after a few timesteps, I am getting the janaf (temperature out of bounds) warning. Eventually, after some timesteps, the simulation stops.

I searched through the posts and found some threads. But, I am not able to understand as to how I can resolve this error.

Can you (or someone else) help in this regard?

Thanks!

[khedar]

Reply to post 6: did you copy 0.org Folder to 0 Folder before running the changeDictionary ?
Reply to post 7: normally out of bounds error for any field Variable is either due to Bad Mesh or improper boundary conditions..I would suggest you to do a checkMesh for your Mesh and recheck your boundary conditions.. Below is a link to a seemingly good Tutorial on XiFoam.I have no experience with it..
Good luck.
http://www.tfd.chalmers.se/~hani/kur...port.pdf<br />