Search found 53 matches

by dmitry
10 Mar 2017, 09:23
Forum: ElmerSolver
Topic: Heat simulation mesh lvl3 cylinder shape issue
Replies: 7
Views: 5496

Re: Heat simulation mesh lvl3 cylinder shape issue

Hi!
I guess, in order to help you, we need the SIF file and the mesh, you used.
by dmitry
30 Dec 2016, 08:26
Forum: ElmerSolver
Topic: 3-Dimensional Natural Convection
Replies: 4
Views: 4592

Re: 3-Dimensional Natural Convection

Hi!
I just have look at SIF. I don't try to run the case.
One thing, I've spotted is:

Code: Select all

  Variable = Flow Solution[Velocity:2 Pressure:1]
In 3D case it should be

Code: Select all

  Variable = Flow Solution[Velocity:3 Pressure:1]
in order to initialize three components of Velocity vector.
Good luck! ;)
by dmitry
21 Oct 2016, 23:36
Forum: ElmerSolver
Topic: Failed convergence tolerances
Replies: 9
Views: 8852

Re: Failed convergence tolerances

Yor're welcome Anil ;) In addition to previous post I'd like to share transient version of sif. Quite funny results obtained. First the flow moves forward and symmetrically. I thought previous steady simulation is wrong... But after thinking some time the flow decides where to go. With different set...
by dmitry
16 Oct 2016, 13:07
Forum: ElmerSolver
Topic: Failed convergence tolerances
Replies: 9
Views: 8852

Re: Failed convergence tolerances

Hi, dear Cristobal! In incompressible flow inlet and outlet velocities have to be equal. That is not observed on specified picture. So, we have to do something. I played around with Cristobal's reactor and I want to share the results. I have prepared a non-GUI case and obtained the results. First of...
by dmitry
11 Oct 2016, 13:37
Forum: ElmerSolver
Topic: k-epsilon model for turbulence
Replies: 7
Views: 5905

Re: k-epsilon model for turbulence

Hmm...
It is strange. I just have downloaded your project, load it to ElmerGUI and press "Start". Convergence was reached after 46 iterations.
by dmitry
07 Oct 2016, 08:32
Forum: ElmerSolver
Topic: material for thermal/heat simulation
Replies: 2
Views: 2346

Re: material for thermal/heat simulation

Hi!
Heat eqn. besides heat conductivity includes heat capacity and density. So, if you do not specify these parameters, you will not be able to solve Heat eqn. correctly

Regards, Dmitry!
by dmitry
05 Oct 2016, 19:53
Forum: ElmerSolver
Topic: k-epsilon model for turbulence
Replies: 7
Views: 5905

Re: k-epsilon model for turbulence

Hi, Saaddin! You missed one important thing. Amount of Nonlinear iterations of both solvers have to be equals one, as mentioned in tutorial. Nonlinear System Max Iterations = 1 Oterwise Elmer try to solve only NavierStokes eqn. first and it do not calculate k and e after NavierStokes iteration. The ...
by dmitry
04 Oct 2016, 16:58
Forum: ElmerSolver
Topic: k-epsilon model for turbulence
Replies: 7
Views: 5905

Re: k-epsilon model for turbulence

I guess, you should provide your last try (sif file), then we can understand, what to do.
by dmitry
03 Oct 2016, 18:32
Forum: Contributed Cases
Topic: Multi-phase flow simulation 2D - Level Set Method
Replies: 2
Views: 6257

Re: Multi-phase flow simulation 2D - Level Set Method

Hi, Peter! Thank you for your detailed comments!
Elmer cover some fields of my interests, but, I guess, it's inevitable to start learn OpenFOAM, if I want to deal with free surfaces effectively.

Regards, Dmitry!
by dmitry
02 Oct 2016, 18:33
Forum: Contributed Cases
Topic: Multi-phase flow simulation 2D - Level Set Method
Replies: 2
Views: 6257

Multi-phase flow simulation 2D - Level Set Method

Hi dear Elmer users! I want to share a non-GUI case of 2D multi-phase flow simulation by the means of Level Set Method. Falling water column simulated here. Case is based on "levelset3" test. Also present post touch on a matter of following topic (Density ratio of phases 1/1000): http://ww...