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Search: Posts Made By: kalyangoparaju
Forum: OpenFOAM June 21, 2013, 12:41
Replies: 0
Views: 456
Posted By kalyangoparaju
Issues with running in parallel OF-2.2.0

Friends,

I am running OF-2.2.0 on a Fedora OS. I tried meshing in parallel using the following command

mpirun -np 64 snappyHexMesh -parallel

Unfortunately, the program crashes with a...
Forum: Main CFD Forum March 23, 2013, 20:57
Replies: 2
Views: 723
Posted By kalyangoparaju
I do LES on jet flows and generally, the mesh...

I do LES on jet flows and generally, the mesh sizes range any where from 6 mil to 20-30 mil depending on the resources. A good size would be around 6-10 mil .
Forum: OpenFOAM Running, Solving & CFD August 13, 2012, 07:47
Replies: 2
Views: 951
Posted By kalyangoparaju
topoSetDict is used for creating/adding/deleting...

topoSetDict is used for creating/adding/deleting and manipulating operations on point,face and cellZones. For more information on how to write a topoSetDict or the options available, go to
...
Forum: OpenFOAM Running, Solving & CFD August 9, 2012, 16:05
Replies: 6
Views: 944
Posted By kalyangoparaju
I had very very similar problem when I tried to...

I had very very similar problem when I tried to simulate a roundtip airfoil inside a windtunnel and analyze the generated vortex.. there are couple of things to keep in mind.

1. It is a good thing...
Forum: OpenFOAM Running, Solving & CFD August 9, 2012, 14:05
Replies: 1
Views: 533
Posted By kalyangoparaju
The error has been resolved .. Even though...

The error has been resolved ..

Even though checkMesh hasn't given me any errors, looks like the mesh is not the best in the world. I had to use 10 nonOrthogonalCorrectors to get it to run and...
Forum: OpenFOAM Running, Solving & CFD August 9, 2012, 14:03
Replies: 6
Views: 944
Posted By kalyangoparaju
Can you please be a bit more clear. As I...

Can you please be a bit more clear.

As I understand you want to simulate the flow over a delta wing in ground effect . Am I right? it is just the wing and the ground and everywhere else it is...
Forum: OpenFOAM Running, Solving & CFD August 9, 2012, 13:58
Replies: 3
Views: 1,496
Posted By kalyangoparaju
When you run potentialFoam, it will initialize...

When you run potentialFoam, it will initialize the U field and write a new boundary condition file called phi which is not compatible with compressible flow. Just delete the phi field and if there...
Forum: OpenFOAM Running, Solving & CFD August 9, 2012, 13:54
Replies: 2
Views: 969
Posted By kalyangoparaju
Hi Maja, If the checkMesh reports...

Hi Maja,

If the checkMesh reports nonOrthogonal and skewed cells, then there is a very good chance that the blowup is because of the mesh. Try changing the nNonOrthogonalCorrectors and also...
Forum: OpenFOAM Running, Solving & CFD August 7, 2012, 11:45
Replies: 1
Views: 533
Posted By kalyangoparaju
Fluctuating sum local error

Guys,

I am having this problem where the sum local fluctuates between 10-30 for I have no idea why. I am running rhoPorousMRFSimpleFoam and everything seems to be right but sum local does this....
Forum: OpenFOAM Native Meshers: snappyHexMesh and Others August 7, 2012, 08:58
Replies: 5
Views: 896
Posted By kalyangoparaju
Deepak, If I understand your problem right,...

Deepak,

If I understand your problem right, you have a cylinder ( pipe) within a bigger pipe(domain) right? And do you want to mesh the inside of the smaller pipe or outside of the smaller pipe? ...
Forum: OpenFOAM Native Meshers: snappyHexMesh and Others July 26, 2012, 15:16
Replies: 23
Views: 6,110
Posted By kalyangoparaju
Thanks a lot bruno. That was indeed a fantastic...

Thanks a lot bruno. That was indeed a fantastic presentation. It definitely helped me sort out my issue but not the way I wanted it to.

The work around I have is, I merged all the stls into 1 stl...
Forum: OpenFOAM Meshing & Mesh Conversion July 26, 2012, 10:36
Replies: 5
Views: 3,319
Posted By kalyangoparaju
ways to create cellZones and faceZones

Friends,

I've been playing around a lot with the creation of cellZones and faceZones and here is what I have to report !

Till now I have found 3 ways to do it. ( I am sure there are more)
...
Forum: OpenFOAM Native Meshers: snappyHexMesh and Others July 24, 2012, 19:33
Replies: 23
Views: 6,110
Posted By kalyangoparaju
Bruno, Here is another picture ( edited in...

Bruno,

Here is another picture ( edited in MS paint ;-) )

The arrow indicates the direction of flow. The geometry, I think, is pretty easy to understand. It has walls everywhere.. completely...
Forum: OpenFOAM Native Meshers: snappyHexMesh and Others July 24, 2012, 13:32
Replies: 3
Views: 992
Posted By kalyangoparaju
Mihai, were you able to successfully mesh...

Mihai,

were you able to successfully mesh this geometry? how did you go about it?

Kalyan
Forum: OpenFOAM Native Meshers: snappyHexMesh and Others July 23, 2012, 20:15
Replies: 23
Views: 6,110
Posted By kalyangoparaju
Bruno, Specifically,this is what is...

Bruno,

Specifically,this is what is happening


14719

The mesh is supposed to be inside the octagon, but it ends up being everywhere. The pic shows the 3 stls. You can see the higher...
Forum: OpenFOAM Native Meshers: snappyHexMesh and Others July 23, 2012, 19:17
Replies: 23
Views: 6,110
Posted By kalyangoparaju
Bruno, Now that I have your attention, I...

Bruno,

Now that I have your attention, I will try to explain my problem.

When I have 3 closed stls and I put them in triSurface and run snappy, there is a particular line in the output which...
Forum: OpenFOAM Native Meshers: snappyHexMesh and Others July 23, 2012, 16:45
Replies: 2
Views: 1,201
Posted By kalyangoparaju
Multi Stl snappyHexMesh

Friends,

I am trying to mesh a geometry with 3 regions ( inlet, porous and outlet). I have 3 closed stl's for all the 3 regions in the triSurface dictionary. When I write the snappyHexMeshDict (...
Forum: OpenFOAM Running, Solving & CFD July 23, 2012, 14:51
Replies: 6
Views: 2,090
Posted By kalyangoparaju
Claudio, I know it is too late but did that...

Claudio,

I know it is too late but did that suggestion help? i.e. setting them to cyclic.

Kalyan
Forum: OpenFOAM Native Meshers: snappyHexMesh and Others July 23, 2012, 10:31
Replies: 23
Views: 6,110
Posted By kalyangoparaju
Bruno, Should this procedure be followed...

Bruno,

Should this procedure be followed always if we want a multi region mesh? I have 3 different closed stls which make the inlet, porous and outlet of a pipe. When I mesh, I have all the...
Forum: OpenFOAM Running, Solving & CFD July 23, 2012, 09:21
Replies: 2
Views: 696
Posted By kalyangoparaju
Yannick, The fact that the mass flow is not...

Yannick,

The fact that the mass flow is not balanced ( inlet 1 = outlet1 +outlet2), I think, points towards boundary conditions or any other issue rather than the pimple solver setup.

Kalyan
Forum: OpenFOAM Running, Solving & CFD July 23, 2012, 09:18
Replies: 2
Views: 409
Posted By kalyangoparaju
Amirr, Make sure the meshes fit well. It...

Amirr,

Make sure the meshes fit well. It might be a good idea to check the merged mesh in paraview after you merge them. There have been issues when other users saw a few gaps in the geometry.
...
Forum: OpenFOAM Native Meshers: snappyHexMesh and Others July 23, 2012, 08:03
Replies: 14
Views: 3,951
Posted By kalyangoparaju
Eric, In my very limited experience, I...

Eric,

In my very limited experience, I noticed that getting values of y+ below 10 is not really possible using snappy. I would be really glad if someone has a solution for this but till date, I...
Forum: OpenFOAM Meshing & Mesh Conversion July 23, 2012, 07:57
Replies: 2
Views: 866
Posted By kalyangoparaju
Shailesh, I am sorry for the late reply. ...

Shailesh,

I am sorry for the late reply.

Running snappy in parallel is exactly the same as running any other solver in parallel. You need to have the decomposeParDict which has the...
Forum: OpenFOAM July 19, 2012, 11:19
Replies: 6
Views: 1,281
Posted By kalyangoparaju
Amit, Did you solve your problem. I am...

Amit,

Did you solve your problem.

I am assuming that you have a high relaxation factor for epsilon. Decreasing it might help. If not, try to change the initial values of epsilon.

Also, to...
Forum: OpenFOAM July 19, 2012, 11:16
Replies: 2
Views: 1,103
Posted By kalyangoparaju
Hi, I know this is very late but did you...

Hi,

I know this is very late but did you solve your problem. The issue can be with the porosity treatment.

I had a similar problem when I was using explicit porosity treatment for high...
Showing results 1 to 25 of 53

 
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