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Search: Posts Made By: Tobi
Forum: OpenFOAM August 1, 2015, 09:04
Replies: 2
Views: 52
Posted By Tobi
Exactly, nothing special :) One guy asked me...

Exactly, nothing special :)
One guy asked me yesterday if I can make it for him and due to the fact it's so simple, I did it last night. Nonetheless I wanted to share it, although it's very simple.
Forum: OpenFOAM August 1, 2015, 04:56
Replies: 2
Views: 52
Posted By Tobi
heatSimpleFoam

Hi all,

yesterday I implemented the temperature equation and heat flux vector into simpleFoam. I did not test it but feel free to check, use and modify it like you want.
...
Forum: OpenFOAM July 31, 2015, 05:18
Replies: 5
Views: 122
Posted By Tobi
Hi Fabian, at the beginning I was wondering...

Hi Fabian,

at the beginning I was wondering why its less diffusive but the reason for that is exactly what we are talking about. (U - Urel) ~ 0. I also tried with different schemes, second order,...
Forum: OpenFOAM Programming & Development July 25, 2015, 11:43
Replies: 5
Views: 253
Posted By Tobi
It's more like: scalar t =...

It's more like:


scalar t = U.runTime().value();


You only can call runTime().value() with an object. Or maybe with the Namespace::
Forum: OpenFOAM Running, Solving & CFD July 24, 2015, 02:17
Replies: 16
Views: 9,583
Posted By Tobi
Hi, why we introduce divDevReff or...

Hi,

why we introduce divDevReff or divDevRhoReff is due to the turbulence models. This function is updated in the turbulence-models and can be modified easily. Otherwise you have to reprogramm the...
Forum: OpenFOAM Programming & Development July 23, 2015, 12:35
Replies: 502
Views: 27,807
Posted By Tobi
Its Not the mixture fraction, it's its Varianz...

Its Not the mixture fraction, it's its Varianz ... Zvar is defined between 0 and 0.25 (parabolic profile). No area weight ed interpolation possible.
See also...
Forum: OpenFOAM July 23, 2015, 10:32
Replies: 5
Views: 122
Posted By Tobi
Hi chriss, you are right. There is always...

Hi chriss,

you are right. There is always Diffusion, hence there is only convection. But like you mentioned, I also don't know why I get the better result with mesh motion. Maybe it's due to the...
Forum: OpenFOAM July 23, 2015, 08:59
Replies: 5
Views: 122
Posted By Tobi
Passive scalar is diffusive without mesh motion

Hi all,

I have a question to all of you. Maybe you are more familiar with that problem. The case is very simple. A 2d rectangular with an outlet velocity of 1m/s, p is fixed at the inlet with...
Forum: OpenFOAM Running, Solving & CFD July 20, 2015, 16:43
Replies: 1
Views: 58
Posted By Tobi
Hi all, solved. Re-programmed all stuff...

Hi all,

solved. Re-programmed all stuff @home and it work now.
Forum: OpenFOAM Running, Solving & CFD July 20, 2015, 15:27
Replies: 1
Views: 58
Posted By Tobi
icoFoam with density

Dear all Foamers,

I want to ask for help, because at the moment I get stuck.

Problem:
I want to make a cavity case in which the bottom is cooled and therefore density change will force flow to...
Forum: OpenFOAM Running, Solving & CFD July 15, 2015, 15:07
Replies: 16
Views: 9,583
Posted By Tobi
divDevRhoReff and divDevReff

Hi all,

as I read before, there are still some people who are confused about the equations and the behavior of the implemented code. Therefore, I want to make the derivations and want to show you...
Forum: OpenFOAM July 10, 2015, 07:02
Replies: 0
Views: 88
Posted By Tobi
Plastic Modulus

Hi all,

does anybody know how the plastic modulus is defined?
Doing some stress analyzes with foam-extend but I do not know how to set up Ep (plastic modulus) for my material. I do not find any...
Forum: OpenFOAM Running, Solving & CFD July 2, 2015, 06:38
Replies: 15
Views: 325
Posted By Tobi
But your solution gets very diffusive (just as a...

But your solution gets very diffusive (just as a hint).
Maybe you can switch to a high order scheme after a few timesteps, or even after the solution is converged to improve your gradients.
Forum: OpenFOAM Pre-Processing July 1, 2015, 01:50
Replies: 4
Views: 145
Posted By Tobi
Hi, I also checked the von Mises at the...

Hi,

I also checked the von Mises at the plateHole but did not get same results. Using that
formula:


https://upload.wikimedia.org/math/6/6/6/66613de183b344ea370a669dbe4087ab.png

I get...
Forum: OpenFOAM Pre-Processing June 30, 2015, 14:55
Replies: 4
Views: 145
Posted By Tobi
Hi Philip, thanks for your replay. I already...

Hi Philip,

thanks for your replay. I already saw today, that you are using stress solver within openfoam. I will check it out tomorrow but in my case it was a 3d cylinder with a tension force.
...
Forum: OpenFOAM Pre-Processing June 30, 2015, 09:46
Replies: 4
Views: 145
Posted By Tobi
Stress Analyzes, sigmaEq and Von Mises

Hi all,

I am a bit confused at the moment. Using the solver solidDisplacementFoam and a simple test case (beam with tension; fixed pressure) leads to a sigmaEq which should be the von Mises...
Forum: OpenFOAM Running, Solving & CFD June 29, 2015, 07:55
Replies: 15
Views: 325
Posted By Tobi
Hello Max, 1900 Iterations are not really a...

Hello Max,

1900 Iterations are not really a lot of iteration. In my combustion solver I have to run something like 30.000 Iterations till I reach a steady state situation. This always depend on...
Forum: OpenFOAM Running, Solving & CFD June 29, 2015, 07:48
Replies: 5
Views: 210
Posted By Tobi
Hi, normally you should not ask "why this...

Hi,

normally you should not ask "why this happens" (:
Check your results, and then think about it. For me it seems that you choose a BC configuration that allows you to create a pressure...
Forum: OpenFOAM Running, Solving & CFD June 24, 2015, 09:02
Replies: 5
Views: 210
Posted By Tobi
Hi, Boundary Condition for U for...

Hi,

Boundary Condition for U


for the outlet you can use inletOutlet and set inletValue to zero to provide no backflow



the rest is okay
Forum: OpenFOAM Running, Solving & CFD June 23, 2015, 10:15
Replies: 32
Views: 507
Posted By Tobi
In the previous post I wanted to say that you...

In the previous post I wanted to say that you have to implement it yourself ;)
Everything is still included so I know that its not a hard task :)

So good luck and keep the community up to date.
Forum: OpenFOAM Running, Solving & CFD June 23, 2015, 08:38
Replies: 32
Views: 507
Posted By Tobi
I think it's a good start. As I mentioned, the...

I think it's a good start. As I mentioned, the time resolution is necessary to get the information path (I only read about it, because I never used sonic/supersonic flows). Normally the Pimple loop...
Forum: OpenFOAM Running, Solving & CFD June 23, 2015, 08:35
Replies: 32
Views: 507
Posted By Tobi
Thanks, I already know that, but if you want...

Thanks, I already know that, but if you want additional output you have to hard code it :)
Back to the topic,...

I am not sure if in special cases D0 and D differs if you have alpha = 1. I think...
Forum: OpenFOAM Running, Solving & CFD June 23, 2015, 06:41
Replies: 32
Views: 507
Posted By Tobi
Hi all, dear Chriss, I checked the...

Hi all, dear Chriss,

I checked the relaxation function and here is the result:

### Case 1 ###
Using the following relax dictionary:

relaxationFactors
{
fields
Forum: OpenFOAM Running, Solving & CFD June 23, 2015, 05:41
Replies: 32
Views: 507
Posted By Tobi
Hi Chriss, you are welcomed for discussion....

Hi Chriss,

you are welcomed for discussion. Also I learn always new things and repeating is very good for keeping the stuff in mind. Okay as far as you told, you get the point of relaxation, final...
Forum: OpenFOAM Running, Solving & CFD June 23, 2015, 04:40
Replies: 32
Views: 507
Posted By Tobi
So you did not get the point ;) You are using...

So you did not get the point ;)
You are using relaxation wrong, as mentioned above.
Showing results 1 to 25 of 1088

 
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