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how to add impulses in Elmer
Posted: 19 May 2019, 09:03
by chen junnan
Hello.I want to use the ELMER to do the fsi about the artery.
Now I have mode a simple model for it and completed the simulation.
I uploaded the sif file.
The next step I want to add the impulses into the input flow.
Could you give me an advice?
Thanks in advance
Re: how to add impulses in Elmer
Posted: 20 May 2019, 22:20
by kevinarden
You can use MATC to input as a function of time or use tables, see the MATC manual
Velocity = Variable Time
Real MATC "if (tx <= .01) (tx/.01)*200.E6; if (tx > .01) 0.0"
Re: how to add impulses in Elmer
Posted: 21 May 2019, 13:27
by kevinarden
Tables and Arrays
Tables (piecewise linear
or cubic):
Arrays:
Velocity = Variable Time
Real cubic
0 0
.1 1
.2 0
.3 1
.4 0
.5 1
End
Re: how to add impulses in Elmer
Posted: 27 May 2019, 11:15
by chen junnan
Hello kevinarden.Many thanks.
I followed your advice to input the impulses in Elmer.
But it does not work.If there something wrong in my operation?
I only use the Navier-Stokes and Nonlinear-Elasticty solutions for Fsi.
Do I need to add Mesh updates solution?
Could you please explain it more specifically.
Many Thanks.
chen
Re: how to add impulses in Elmer
Posted: 27 May 2019, 15:48
by raback
Hi chen,
Why don't you look at test case "ArteryOutlet" under $ELMERSRC/fem/test. It comes with
- coupled fluid-structure & mesh update
- 1D non-reflective outlet model with on-the-fly defined mesh
- pulse defined in an UDF function
To have all these defined in the GUI is not currently practical as there are some rare solvers that do not have menu stuctures defined (like the ArteryOutlet solver).
-Peter
Re: how to add impulses in Elmer
Posted: 28 May 2019, 09:37
by chen junnan
Hello peter,
I find the test case that you reminded.
But I do not konw how to use it.Is there some instructions about it ?
Thank you.
-chen
Re: how to add impulses in Elmer
Posted: 28 May 2019, 11:55
by kevinarden
read the runtest.cmake file the mesh is made by
ElmerGrid 1 2 contra.grd
then run the problem with the case.sif using
ElmerSolver
Re: how to add impulses in Elmer
Posted: 28 May 2019, 12:29
by kevinarden
chen junnan wrote: ↑27 May 2019, 11:15
Hello kevinarden.Many thanks.
I followed your advice to input the impulses in Elmer.
But it does not work.If there something wrong in my operation?
I only use the Navier-Stokes and Nonlinear-Elasticty solutions for Fsi.
Do I need to add Mesh updates solution?
Could you please explain it more specifically.
Many Thanks.
chen
You would have to describe how it doesn't work or post both the sif and mesh file and i can test it.