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Showing results 1 to 12 of 12 Search took 0.00 seconds. Search: Posts Made By: inf.vish

Forum: OpenFOAM Running, Solving & CFD August 28, 2013, 02:10

Replies: 22 Relative roughness in openfoam Views: 6,781 Posted By inf.vish Thanks. I will have a look at the links. ... Thanks. I will have a look at the links. The link you mentioned above is not opening. I do not want to go into the complications of LES since I will be using kOmegaSST only. The problem i...

Forum: OpenFOAM Running, Solving & CFD August 27, 2013, 06:58

Replies: 22 Relative roughness in openfoam Views: 6,781 Posted By inf.vish Thanks I will try. One more question, do the... Thanks I will try. One more question, do the values of k and omega (or epsilon) affect the final solution? I was trying out various values but found that for k>epsilon i get floating point...

Forum: OpenFOAM Running, Solving & CFD August 27, 2013, 00:53

Replies: 22 Relative roughness in openfoam Views: 6,781 Posted By inf.vish I have no idea about y+. I am an undergraduate... I have no idea about y+. I am an undergraduate student and have to do openfoam as part of my internship. I have no prior knowledge of CFD and turbulence models. Thus it is very difficult for me to...

Forum: OpenFOAM Running, Solving & CFD August 25, 2013, 23:23

Replies: 22 Relative roughness in openfoam Views: 6,781 Posted By inf.vish Hello, Sorry for the late reply. Weekends. ... Hello, Sorry for the late reply. Weekends. These are my yPLus values 24826 Also, I am using k-epsilon turbulence model.

Forum: OpenFOAM Running, Solving & CFD August 23, 2013, 07:21

Replies: 22 Relative roughness in openfoam Views: 6,781 Posted By inf.vish Oh it's okay. I will try changing the values of k... Oh it's okay. I will try changing the values of k and epsilon. I read somewhere on the forum that the values of k and epsilon do not matter. So if i set them 0 it should simulate properly. am i...

Forum: OpenFOAM Running, Solving & CFD August 20, 2013, 05:35

Replies: 22 Relative roughness in openfoam Views: 6,781 Posted By inf.vish It is a very simple problem. I have been stuck on... It is a very simple problem. I have been stuck on it for quite a while and honestly, it is getting quite frustrating now. Thanks in advance :)

Forum: OpenFOAM Running, Solving & CFD August 20, 2013, 05:14

Replies: 22 Relative roughness in openfoam Views: 6,781 Posted By inf.vish Yes you are quite right. Cf is called the fanning... Yes you are quite right. Cf is called the fanning friction factor. And you can calculate Darcy friction factor using Colebrook equation. Now my conclusion is - Obtain Fanning friction coefficient...

Forum: OpenFOAM Running, Solving & CFD August 19, 2013, 23:57

Replies: 22 Relative roughness in openfoam Views: 6,781 Posted By inf.vish There is one more problem though. This is... There is one more problem though. This is the test case i am trying out. Just to learn about turbulence. But even at 10^6 reynolds number i am getting laminar streamlines. Can you look up and tell...

Forum: OpenFOAM Running, Solving & CFD August 19, 2013, 23:09

Replies: 22 Relative roughness in openfoam Views: 6,781 Posted By inf.vish Hmm. Okay I will try that. Relative roughness... Hmm. Okay I will try that. Relative roughness means e/D. The right hand scale on moody's chart. Also, Cf is skin friction factor. I believe it is not the same as the friction factor f which is on...

Forum: OpenFOAM Running, Solving & CFD August 18, 2013, 23:20

Replies: 22 Relative roughness in openfoam Views: 6,781 Posted By inf.vish I do not quite get your point over here. The only... I do not quite get your point over here. The only way you can validate using Moody's chart is that you know Reynolds number and relative roughness and you obtain friction factor from openfoam and...

Forum: OpenFOAM Running, Solving & CFD August 16, 2013, 06:01

Replies: 22 Relative roughness in openfoam Views: 6,781 Posted By inf.vish Okay i just realised that my way of validating... Okay i just realised that my way of validating turbulent flow is wrong. Can you tell me how to validate a turbulent flow using some analytical results, like we have poiseuille's law for laminar...

Forum: OpenFOAM Running, Solving & CFD August 16, 2013, 04:44

Replies: 22 Relative roughness in openfoam Views: 6,781 Posted By inf.vish Relative roughness in openfoam How to incorporate relative roughness in openfoam? I am using pisoFoam to solve a simple turbulent flow through a pipe. I want to validate the result using Moody's chart, where i specify reynolds...

Showing results 1 to 12 of 12

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