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-   -   Error with sonicFOAM simulation of wing - db/regIOobject/regIOobjectRead.C (http://www.cfd-online.com/Forums/openfoam-solving/111386-error-sonicfoam-simulation-wing-db-regioobject-regioobjectread-c.html)

Jaggy_Snake January 5, 2013 14:22

Error with sonicFoam simulation - 'keyword ffminx is undefined'
 
[EDIT] I accidentally mis-titled this thread... Is it possible for a mod to change the title to "Error with sonicFoam simulation - 'keyword ffminx is undefined' " ?


Hi guys, and a happy new year.


I'm trying to model the flow over an aircraft wing with sonicFlow.

I've generated a tentative mesh of my wing (I'll need to refine it further) and I'm now trying to set up my initial conditions by copying the required files from the sonicFoam/ras/nacaAirfoil tutorial.

When I run sonicFoam I'm getting the following error:
Code:

Create mesh for time = 3

Reading thermophysical properties

Selecting thermodynamics package ePsiThermo<pureMixture<constTransport<specieThermo<eConstThermo<perfectGas>>>>>

--> FOAM FATAL IO ERROR:
keyword ffminx is undefined in dictionary "/home/fergus/OpenFOAM/fergus-2.1.1/run/Again/3/p::boundaryField"

file: /home/fergus/OpenFOAM/fergus-2.1.1/run/Again/3/p::boundaryField from line 25 to line 48

  From function dictionary::subDict(const word& keyword) const
  in file db/dictionary/dictionary.C at line 461.

FOAM exiting

I don't know where/what the 'keyword ffminx' is, and I don't know where to find the file db/dictionary/dictionary.C

Any ideas?



Thanks in advance

Jaggy_Snake January 7, 2013 14:09

OK, I've noticed that 'ffminx' is the name given to one of the patches generated by HelyxOS.

Possibly the way I'm meshing is causing me problems...

I initially meshed with HelyxOS but my wing's trailing edge was badly meshed due to the sharp edge. So I applied the SurfaceFeatureExtract tool by executing:

Code:

surfaceFeatureExtrace -includedAngle 150 -writeObj constant/triSurface/sevensixsevenwing.stl sevensixsevenwing
Then edited the snappyHexMeshDict generated by Helyx by adding the following lines:

Code:

features(
{file "sevensixsevenwing.eMesh";
  level 0;
})

I then deleted the contents of the previous polyMesh folder and re-run snappyHexMesh. This resolves the mesh around the wing trailing edge.

However when I execute sonicFoam, I get the error posted in the original post. Possibly this is bad practise which is causing the described error?


Thanks again, and sorry for the double post.

RocketMan1691 February 21, 2013 03:21

ffminx is one of the patches HELYX generates (the plane corresponding to minimum x). The error relates to the 0/P file which does not have a definition for ffminx. It sounds like switching approaches half way through has left some loose ends.

I would start by checking the boundary conditions in the U and P files have entries corresponding to the blockMesh and snappyHexMesh dictionaries.

A note on sequence too. I have always got very confused if I mess with the sequence because old files get left behind. So once you are happy with the boundary conditions, I would copy the dictionaries to a new case and then run the mesh generation process from scratch.

Hope this helps


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