Filling Process

The graphical user interface of Elmer
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hoppiw07
Posts: 3
Joined: 24 Aug 2021, 12:03
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Filling Process

Post by hoppiw07 »

Hi everyone,

i have a problem with elmer gui and paraview. First to my project, I want so simulate a filling process of a liquid in a glas. The first eight steps looks not too bad, but the drop goes not to the bottom of the glas. Also an error code is always written:
I change the BDF from 1 to 2 to 3, integrate an other solver, change the timesteps and intervall, change constants but nothing gets me ahead and so the error code was the same. Did someone have an idea whats the problem in my sif or mesh is?

Thanks in advance.
Attachments
case.sif
(4.81 KiB) Downloaded 21 times
2D.msh
(682.25 KiB) Downloaded 15 times
2D.geo
(809 Bytes) Downloaded 16 times
hoppiw07
Posts: 3
Joined: 24 Aug 2021, 12:03
Antispam: Yes

Re: Filling Process

Post by hoppiw07 »

as an complement to my first message
Attachments
mesh.elements
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mesh.boundary
(12.68 KiB) Downloaded 13 times
egproject.xml
(152.28 KiB) Downloaded 15 times
Rich_B
Posts: 68
Joined: 24 Aug 2009, 20:18

Re: Filling Process

Post by Rich_B »

Hi,

I ran your case, here is the last section of the solver output:
FlowSolve: -------------------------------------
FlowSolve: NAVIER-STOKES ITERATION 20
FlowSolve: -------------------------------------
FlowSolve:
FlowSolve: Starting Assembly...
FlowSolve: Assembly:
: ..Assembly done
FlowSolve: Dirichlet conditions done
ComputeChange: NS (ITER=20) (NRM,RELC): ( 0.87747935E+40 1.5579146 ) :: navier-stokes
FlowSolve: iter: 20 Assembly: (s) 2.59 49.28
FlowSolve: iter: 20 Solve: (s) 0.26 6.35
FlowSolve: Result Norm : 8.7747935060334869E+039
FlowSolve: Relative Change : 1.5579145737967666
SaveResult: -----------------------------------------
SaveResult: Saving results to file: ./2D/previousrun.result
SaveResult: Done writing results file
SaveResult: -----------------------------------------
ResultOutputSolver: -------------------------------------
ResultOutputSolver: Saving in unstructured VTK XML (.vtu) format
ResultOutputSolver: -------------------------------------
LevelSetTimestep: Levelset timestep 1.235E-42
ERROR:: ExecSimulation: Timestep smaller than epsilon: 1.235E-42
If you search the forum for
levelset peter
look for items such as this one:

viewtopic.php?f=7&t=4&p=21833&hilit=lev ... ter#p21833
Unread post by raback » 03 Dec 2019 16:42
Hi Brando,

This might be outside the capabilities of Elmer. Sloshing has been done only for fluids that do it in a civilized manner (using moving mesh & ALE formulation). Severe sloshing would be better of with VOF or SMH methods. We have levelset but it is pretty simple one and does not conserve mass. Elmer does have particles but there can be no shear between them currently. I would probably look at codes that were built on particles in mind. FEM excels on PDEs that have some minimization principle associated and you've none of that here.

-Peter
Rich.
hoppiw07
Posts: 3
Joined: 24 Aug 2021, 12:03
Antispam: Yes

Re: Filling Process

Post by hoppiw07 »

Thanks Rich_B for your help.

In the time, i optimize the sif and it looks a little bit better. But the problem is also that the gas go not realistic out and the drop reach not correct the buttom

I also had the idea to solve the problem with freesurface but i think, for a liquid is levelset the correct part.

Does someone see the mistake in the sif and can help?

Big thanks in advance.

hoppiw07
Attachments
case.sif
here my sif.
(4.92 KiB) Downloaded 10 times
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