Elmer Discussion Forum

Hi, Thank you Peter for revealing this “special” syntax of MATC expression. There is nothing written about this in the MATCManual.pdf, and (unless analysing the source code) I would have perhaps never used this form. More accurately, I would have never used this form again, because I have attempted ...

Hi Peter, Thank you for helping us understand Elmer. Your explanation, and especially the sentence: Unless there is some variable involved "MATC" does not offer any advantage over "$" but is more costly. creates an impression that the two forms of MATC expressions: $ expression M...

This post presents a way to use an arbitrary parameter name Cv as “Flux Coefficient” in FluxSolver and assign a value to it using a MATC expression. Apparently, MATC can not use parameters defined in sif file sections, but all parameters and variables we want to use in MATC must be first declared at...

This post is a clarification of my earlier confusion concerning the MATC calculation of the “Flux Coefficient” in FluxSolver. Found the source of confusion mentioned in my post dated 08 Jan 2018, 13:56. During my experimentations with FluxSolver the expression: Cv = 3.85e-4 was first used in section...

That would be very practical indeed. Actually there is work on a solution for that: The Elmer plugin for Salomé can already reload sif files it writes (see http://www.elmerfem.org/forum/viewtopic.php?f=9&t=4482 ). But it doesn't implement more sif features than ElmerGUI. I am just starting to w...

Hi Adamo, Thanks for sharing the hack. I am not using this solver at the moment, but interested in this technique that you used to fix the problem. There are similar problems in FluxSolver as well, which could be perhaps fixed in a similar way as you did here. Did you compile the source code on Wind...

Hi Matthias, Thanks for the great tip! If the compilation process doesn't get clarified in the near future, then surely the second best option is to use Launchpad. Actually in mean time I have deleted Linux Mint 17, and installed Ubuntu 16.04 specifically to be able to use Launchpad (we have to prog...

Hi Matthias, Thank you for sharing useful information. I will delete Ubuntu and install Linux Mint later; this time your version of 17.3 and see if Elmer can be installed correctly from Launchpad on my computer as well. But right now I am lost in figuring out how to use Elmer for acoustics (this is ...

After two steps forward, here is the one step back: During night of 6th January I was able to successfully run the FluxSolver as described in my previous post using Cv = Real MATC "1/(Density * Angular Frequency)" in the Material 1 section. The results were good as well. Then around middle...

An update: found out how to define an arbitrary Flux Coefficient for the FluxSolver and assign a value to it via a formula. In the “Material 1” section define the arbitrary variable (or constant) Cv either by assigning a known number to it like: Cv = Real 3.85e-4 or by assigning a value to it by a M...