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transient boundary conditions
Posted: 05 Feb 2010, 16:59
by 1234hoedjevanpapier
Hi all,
I was wondering if it is possible to define time-dependent boundary conditions (for example temperatures or heat fluxes) in ElmerGUI? Is it also possible to read time-dependent profiles from textfiles?
thanks for your help.
regards,
Jeroen
Re: transient boundary conditions
Posted: 08 Feb 2010, 02:27
by 1234hoedjevanpapier
Dear elmer team,
I found out that the 'scanning' mode can be used to define time dependent boundary conditions? I ran a test case, but thus far the temperature boundary does not change. I added a profile for boundary condition 3 with the following code, similar to a previous post
viewtopic.php?f=3&t=274&p=928&hilit=scanning#p928:
Code: Select all
Boundary Condition 3
Target Boundaries(1) = 3
Name = "Time_boundary"
Temperature = Variable Time
Real
0 266.65
1 266.05
2 265.85
3 265.45
4 265.25
5 265.05
6 264.85
7 264.55
8 264.65
9 265.25
10 266.45
11 267.25
12 268.15
13 268.75
14 269.15
15 269.25
16 269.45
17 268.75
18 269.15
19 269.75
20 269.65
21 269.75
22 270.05
23 269.95
End
End
the first column is the time step, the second the corresponding temperature. But when postprocessing, the temperatures on boundary 3 do not correspond to the profile I defined/ don't change with time. I put the case in the attachment. What am I doing wrong?
thanks for your help,
Jeroen
- test.zip
- input file and mesh
- (17.12 KiB) Downloaded 464 times
Re: transient boundary conditions
Posted: 08 Feb 2010, 14:17
by raback
Hi Jaroen
As you have a real dependence on time you should use "Simulation Type" "transient" ("scanning" is intended for doing a number os steady state simulations varying some parameters). Then you can have your BCs depend on "time" in three different ways: table, MATC expression, UDF. For more examples look for instance
http://www.nic.funet.fi/pub/sci/physics ... Manual.pdf p. 10-12 or search this site for "MATC".
The table may be included from an extarnal file using the following syntax:
Code: Select all
Temperature = Variable Coordinate 1
Real
include tprof.dat
End
-Peter
Re: transient boundary conditions
Posted: 22 Dec 2013, 17:24
by annier
Hi Peter,
It means the file with filename tprof.dat should be in the same directory with SIF file for the convenience.
Yours
Annier
Re: transient boundary conditions
Posted: 06 Dec 2017, 10:01
by cru2323
I'm looking to do HF Aviation monitoring and scanning of frequencies in memory. I'm used to hardware units such as an R75, which are no longer made. Will SDRPlay be able to be used for HF monitoring and scanning? I'm very unfamiliar with how the software works. Thanks for the help.