Elmer Discussion Forum

Hello, everyone, I am trying to apply the attenuation by divergence model to the Helmholtz equation in Elmer ( damping ). The divergence attenuation model that I apply is: Adiv = 20 × lg(d) + 11 (in dB) In Pa is: Adiv=20e-6 * 10^((20 *LOG(d)/LOG(10) + 11) / 20) where d= distance The way to include i...

Hello everyone! I'm trying to load this .in2d into Elmer GUI, but it crashes without giving me any messages. I have verified that there are no duplicate points or lines, and that the materials are well defined. Also BCs and different maxH configurations. Could it be due to some kind of element limit...

Thank you very much Rich,
I have been able to quickly review that forum thread and it looks very good.
Let's see if I can move forward with that information.

Hello everyone, After my last intervention "https://www.elmerfem.org/forum/viewtopic.php?t=8279" I am still trying to learn about Helmholtz and Wave Equation solvers for environmental noise simulations. I have been studying the code, but I am certainly very limited due to my limited progra...

Thank you so much!

Wave equation: https://youtu.be/zN7UiyHBNmg

Hello again, I have been playing with the equation 12.3 of the ElmerModelsManual and, although it gives different results from p(t), I do not find a physical sense to them. I expected, for example, that at p(t)=0, no waves would be seen in space, however, the result is PW1. This is logical, consider...

Thank you kevinarden, That's what I did. I downloaded it and explored it with VisualStudio. I have to confess that my programming skills are very poor. Reviewing all this, I cannot understand the reason for the difference in the outcome variables. I will start from the hypothesis that in 2D, the &qu...

Hello again.

I have reviewed this file https://github.com/ElmerCSC/elmerfem/bl ... zSolve.F90, but I cannot find the definition of the boundary conditions or the outputs in it.

Variables "pressure wave", "pressure wave 1"... are not mentioned

Thanks @Rich_B and @kevinarden, I really appreciate your help. Sorry for the delay in responding. I've been looking at other forum topics, in particular https://www.elmerfem.org/forum/viewtopic.php?t=4976 and https://www.elmerfem.org/forum/viewtopic.php?t=4553 , that deal with similar problems. I ha...

Thanks again @kevinarden, I've already tried it, but the same thing happens to me with the results of "Pressure Wave 2" and "Pressure Wave 2 flux". In both cases, the result is "0" in the entire domain. I'm applying it to example 17 from Elmer's tutorial https://www.nic...