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Showing results 1 to 15 of 15 Search took 0.00 seconds. Search: Posts Made By: Heroic

Forum: OpenFOAM Running, Solving & CFD December 17, 2012, 02:04

Replies: 26 pisoFoam with k-epsilon turb blows up - Some questions Views: 11,170 Posted By Heroic Hi Aadhavan, For k and epsilon I am using... Hi Aadhavan, For k and epsilon I am using upwind schemes as you stated. In contrast to the values I had before, I found out I had to increase the values outside of the pipe by a lot in order to...

Forum: OpenFOAM Running, Solving & CFD December 13, 2012, 02:44

Replies: 26 pisoFoam with k-epsilon turb blows up - Some questions Views: 11,170 Posted By Heroic It seems I got things up and running now,... It seems I got things up and running now, including the k-epsilon model. Due to some high velocities through small cells I seem to be getting very high (bounded) values for epsilon locally. These are...

Forum: OpenFOAM Running, Solving & CFD December 10, 2012, 10:55

Replies: 26 pisoFoam with k-epsilon turb blows up - Some questions Views: 11,170 Posted By Heroic That is what I have done already. The quality is... That is what I have done already. The quality is at least 0.2 for all tetras. If I check for determinant only, it even says the determinant is 1 everywhere. However, the % behind it less than 100%, I...

Forum: OpenFOAM Running, Solving & CFD December 10, 2012, 08:47

Replies: 26 pisoFoam with k-epsilon turb blows up - Some questions Views: 11,170 Posted By Heroic Hello, I have been working on the mesh in... Hello, I have been working on the mesh in order to get rid of the non-orthogonal elements. Right now I only have bottom up generated tetra mesh (no prism layers), but that should hold to at least...

Forum: OpenFOAM Running, Solving & CFD November 26, 2012, 02:44

Replies: 26 pisoFoam with k-epsilon turb blows up - Some questions Views: 11,170 Posted By Heroic Another update. I have been able to run long... Another update. I have been able to run long simulations on my coarsened mesh with great convergence and no crashes (not sure if I am overthinking things, but could it be that a no-slip wall and a...

Forum: OpenFOAM Running, Solving & CFD November 19, 2012, 02:56

Replies: 26 pisoFoam with k-epsilon turb blows up - Some questions Views: 11,170 Posted By Heroic Hello, I would like to give an update on the... Hello, I would like to give an update on the case. Just for testing purposes I decided to remove the outlet velocity and set it to a zeroGradient instead. It is not exactly what I wanted to...

Forum: OpenFOAM Running, Solving & CFD November 15, 2012, 11:05

Replies: 26 pisoFoam with k-epsilon turb blows up - Some questions Views: 11,170 Posted By Heroic Hi Aadhavan, The turbulence models are of no... Hi Aadhavan, The turbulence models are of no priority at the moment, since simulations also crash when using laminar flow. It seems you have swapped two values, but I do not expect the problems to...

Forum: OpenFOAM Running, Solving & CFD November 13, 2012, 09:53

Replies: 26 pisoFoam with k-epsilon turb blows up - Some questions Views: 11,170 Posted By Heroic Hi Aadhavan, I have been reading a little... Hi Aadhavan, I have been reading a little about Y+ and I realized that I am in the low Re region for which I appear to need values of Y+ < 1 in case of a k-epsilon model. For the laminar...

Forum: OpenFOAM Running, Solving & CFD November 13, 2012, 03:31

Replies: 26 pisoFoam with k-epsilon turb blows up - Some questions Views: 11,170 Posted By Heroic Hi Aadhavan, As I said in my previous post,... Hi Aadhavan, As I said in my previous post, I am slowly starting to think there may be some problems with my mesh as well. The area where it goes wrong is properly meshed though, so I have...

Forum: OpenFOAM Running, Solving & CFD November 12, 2012, 03:49

Replies: 26 pisoFoam with k-epsilon turb blows up - Some questions Views: 11,170 Posted By Heroic The results are in... I tried to simulate both... The results are in... I tried to simulate both with and without a turbulence model enabled. With the k-epsilon model included the simulation crashed within 10 timesteps (probably because of the...

Forum: OpenFOAM Running, Solving & CFD November 9, 2012, 07:04

Replies: 26 pisoFoam with k-epsilon turb blows up - Some questions Views: 11,170 Posted By Heroic Hi Tom, That was exactly my plan. I have... Hi Tom, That was exactly my plan. I have done it with the icoFoam case already, but nothing weird showed up in paraView. It simply went wrong from 1 timestep to another without any visibly weird...

Forum: OpenFOAM Running, Solving & CFD November 9, 2012, 05:36

Replies: 26 pisoFoam with k-epsilon turb blows up - Some questions Views: 11,170 Posted By Heroic Hi Tom, Thanks again for your suggestions. I... Hi Tom, Thanks again for your suggestions. I have now updated my fvSchemes and fvSolution files and a simulation is running as we speak. Running on the original mesh now, as it seems my...

Forum: OpenFOAM Running, Solving & CFD November 7, 2012, 03:33

Replies: 26 pisoFoam with k-epsilon turb blows up - Some questions Views: 11,170 Posted By Heroic Hi Tom, I am aware of the suddenly... Hi Tom, I am aware of the suddenly increasing Courant number and that's pretty much the whole problem. I have been running some simulations using icoFoam (not realistic, but I thought it might...

Forum: OpenFOAM Running, Solving & CFD November 5, 2012, 05:46

Replies: 26 pisoFoam with k-epsilon turb blows up - Some questions Views: 11,170 Posted By Heroic Hi Tom, Thank you for your response. Since I... Hi Tom, Thank you for your response. Since I am not too familiar with meshing and the mesh worked before, I assumed everything would be correct. I guess that is not the way to go ;) First I...

Forum: OpenFOAM Running, Solving & CFD October 31, 2012, 05:49

Replies: 26 pisoFoam with k-epsilon turb blows up - Some questions Views: 11,170 Posted By Heroic pisoFoam with k-epsilon turb blows up - Some questions Hello, I am fairly inexperienced when it comes to OpenFOAM and CFD in general. Slowly I am getting more familiar with the structure of OpenFOAM and I know the basics of CFD, but so far I have...

Showing results 1 to 15 of 15

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