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Search took 0.00 seconds. Search: Posts Made By: fabian_roesler
Forum: OpenFOAM Running, Solving & CFD January 15, 2021, 03:55
Replies: 328
Views: 101,593
Posted By fabian_roesler
Hi, This is my first post since years. The erf...

Hi,
This is my first post since years. The erf function was the first more or less running version we developed at the thermodynamics chair in Bayreuth. The more sophisticated version is in my PhD...
Forum: OpenFOAM Running, Solving & CFD July 20, 2016, 10:04
Replies: 328
Views: 101,593
Posted By fabian_roesler
The solver doesn't differ between melting and...

The solver doesn't differ between melting and solidification.
When a boundary is colder than the melting point, solidification starts.

Cheers

Fabian
Forum: OpenFOAM Running, Solving & CFD July 15, 2016, 03:57
Replies: 328
Views: 101,593
Posted By fabian_roesler
Hi Actually you do not have to compile...

Hi

Actually you do not have to compile anything, as the whole solver for solidification and melting is there as a new fvOption module since version 3.

Check this out:...
Forum: OpenFOAM Running, Solving & CFD October 7, 2015, 03:53
Replies: 328
Views: 101,593
Posted By fabian_roesler
Exclamation solidificationMeltingSource

Hi folks. During a small solver research within OpenFOAM 2.4.x I found a new fvOption for solidification and melting:

Basically it uses the same approach as most solvers in this thread - the...
Forum: OpenFOAM Running, Solving & CFD September 3, 2015, 03:18
Replies: 328
Views: 101,593
Posted By fabian_roesler
Hi manalis It's a long time ago since I...

Hi manalis

It's a long time ago since I posted this solver here. However, I remember that the viscosity was implemented temperature dependant.

mu = mu0*(scalar(1)-max(muk*(T-Tl),scalar(0)));
...
Forum: OpenFOAM Running, Solving & CFD October 17, 2014, 03:20
Replies: 328
Views: 101,593
Posted By fabian_roesler
Hi chriss85 I'd say that solid>liquid>gas...

Hi chriss85

I'd say that solid>liquid>gas transition should be possible. "The only thing" you have to do is implementing the liquid to gas transition into my solver. I put that into quotes because...
Forum: OpenFOAM Running, Solving & CFD October 13, 2014, 08:34
Replies: 328
Views: 101,593
Posted By fabian_roesler
I am happy that you like my work. The solve is...

I am happy that you like my work. The solve is designed for solid/liquid phase change. All the Darcy term and stuff would not be necessary for evaporation. However, its implementation should not be...
Forum: OpenFOAM Running, Solving & CFD October 8, 2014, 07:15
Replies: 328
Views: 101,593
Posted By fabian_roesler
PhD Thesis on modeling and simulation of phase change processes in macro encapsula

Hi Folks

My PhD thesis on modeling and simulation of phase change processes in macro encapsulated latent heat thermal energy storage is now published. It is written in German and was published by...
Forum: OpenFOAM Running, Solving & CFD August 27, 2014, 03:03
Replies: 328
Views: 101,593
Posted By fabian_roesler
Hi Earlier in this thread I posted...

Hi



Earlier in this thread I posted that the erfConvectiveMeltingFoam is a method to decrease the nonlinear behavior of the energy conservation equation. However, you will not get rid of it...
Forum: OpenFOAM Running, Solving & CFD August 19, 2014, 02:55
Replies: 328
Views: 101,593
Posted By fabian_roesler
warning: unused variable

Hi,

those warnings appear because of the curly brackets around the TEqn. The variables are defined outside these brackets and are only used inside. Thus, the compiler does not recognized their...
Forum: OpenFOAM Running, Solving & CFD August 5, 2014, 09:56
Replies: 328
Views: 101,593
Posted By fabian_roesler
Hi Soon, there will be my PhD thesis...

Hi

Soon, there will be my PhD thesis available. I am in the final state of printing and it will also be available as eBook. I will post the link here. Moreover, my former colleges from the chair...
Forum: OpenFOAM Running, Solving & CFD August 5, 2014, 07:17
Replies: 328
Views: 101,593
Posted By fabian_roesler
Yes sure, the boussinesq approximation is only...

Yes sure, the boussinesq approximation is only valid for small temperature differences. However, the error one faces is not that big and the flow field will not change entirely. I also programed a...
Forum: OpenFOAM Running, Solving & CFD August 5, 2014, 02:46
Replies: 328
Views: 101,593
Posted By fabian_roesler
Hi I do not have access to my literature at...

Hi

I do not have access to my literature at the moment. However, what I remember is that the experiments by Gau and Viskanta where stopped at certain times after start of melting; the liquid phase...
Forum: OpenFOAM Running, Solving & CFD August 1, 2014, 05:51
Replies: 328
Views: 101,593
Posted By fabian_roesler
Vortices during melting of metal at a vertical wall

Well, from your transportProperties I can see that you simulate a metal PCM (if I may guess I'd say it is Gallium). Moreover I guess you have a fine mesh.
Have a look into the literature. There you...
Forum: OpenFOAM Running, Solving & CFD July 31, 2014, 02:33
Replies: 328
Views: 101,593
Posted By fabian_roesler
More info

Could you post your setup for OpenFOAM? blockMeshDict, fvSolution, fvSchemes, transportProperties and controlDict. With a litle bit more info the answer could be much more specific.

Cheers Fabian
Forum: OpenFOAM Running, Solving & CFD July 24, 2014, 09:05
Replies: 328
Views: 101,593
Posted By fabian_roesler
Well, do you have a fixed heat flux through the...

Well, do you have a fixed heat flux through the wall or is it an adiabatic wall? Second would be zeroGradient and first depends on what you intend to simulate. For example heat transfer through a...
Forum: OpenFOAM Running, Solving & CFD July 10, 2014, 14:40
Replies: 328
Views: 101,593
Posted By fabian_roesler
Increase outer correctors and maxCO

Hi

as the solver is based on the PIMPLE algorithm you can increase your max Co above one. This is achieved by outer Simple iterations and thus, the conservation equations can be under relaxed....
Forum: OpenFOAM Running, Solving & CFD July 4, 2014, 03:43
Replies: 328
Views: 101,593
Posted By fabian_roesler
compressibleInterFoam and convMeltFoam

Hi steph

I did exactly that within by PhD thesis. I defended the thesis one month ago and it will be published soon. Unfortunately it is written in German. I combined the compressibleInterFoam...
Forum: OpenFOAM Running, Solving & CFD June 30, 2014, 07:27
Replies: 328
Views: 101,593
Posted By fabian_roesler
third solid phase for fins in solid liquid phase change

Hi shakil

Well, I did not perform real conjugate heat transfer simulations with two different meshes for PCM and solid/gas like in chtMultiRegionFoam. However, I did some simulations to study the...
Forum: OpenFOAM Running, Solving & CFD June 27, 2014, 09:29
Replies: 328
Views: 101,593
Posted By fabian_roesler
Parallel convMeltFoam

Hi

attached you find the parallelized convMeltFoam solver. It runs parallel now after decomposing the case. I tested it on a 3D case with 10M cells.

Regards

Fabian
Forum: OpenFOAM Running, Solving & CFD April 24, 2014, 03:55
Replies: 328
Views: 101,593
Posted By fabian_roesler
Thumbs up temperature dependant density for all terms in all conservation equations

Hi Zhipeng

You will not find a ready-made solver for that. However, here is what I did for such problems: I switched from the Boussinesq approximation to a temperature dependent density for all...
Forum: OpenFOAM Running, Solving & CFD April 17, 2014, 10:14
Replies: 328
Views: 101,593
Posted By fabian_roesler
Hi, p_rgh is not the buoyant pressure. It...

Hi,

p_rgh is not the buoyant pressure. It is pressure p minus the static pressure (which is rho*g*h). So p_rgh is the dynamic pressure. As pressure is relative, you set p and p_rgh at the...
Forum: OpenFOAM Running, Solving & CFD April 17, 2014, 08:06
Replies: 328
Views: 101,593
Posted By fabian_roesler
Hi this code snipped checks weather a...

Hi

this code snipped checks weather a reference cell is needed or not and sets the pRefValue to the reference cell pRefCell. In incompressible flow, pressure is relative (the solution does not...
Forum: OpenFOAM Running, Solving & CFD February 26, 2014, 02:40
Replies: 328
Views: 101,593
Posted By fabian_roesler
Version mismatch

Hi wumin

This sounds to me like a version mismatch. Which OpenFOAM version do you use? I bet you use OpenFOAM 2.3.x since the ddtPhiCorr in pEqn was changed to a more general ddtCorr. Have a look...
Forum: OpenFOAM Running, Solving & CFD January 11, 2014, 04:42
Replies: 328
Views: 101,593
Posted By fabian_roesler
melting with third phase

Hi callahance

I did exactly what you propose in my thesis. However, I am still in the PhD process and want the solver, results and thesis be public not before my defense of the doctor's thesis....
Showing results 1 to 25 of 48
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