Search found 26 matches

by JamesMarine
Yesterday, 16:40
Forum: ElmerSolver
Topic: Complicate Noise Source Input in Acoustic Analysis
Replies: 12
Views: 138

Re: Complicate Noise Source Input in Acoustic Analysis

Hi Peter, Many thanks for the instructions on the codes! For the pressure, since i have two values (Pre_re,Pre_imag), can i defined Pressure as Pressure(2) or i need to defined as below: Pressure 1 = Variable "Coordinate" Real Procedure "MyStuff" "acousticPressure1" Pressure 1 = Variable "Coordinate...
by JamesMarine
Yesterday, 03:26
Forum: ElmerSolver
Topic: Complicate Noise Source Input in Acoustic Analysis
Replies: 12
Views: 138

Re: Complicate Noise Source Input in Acoustic Analysis

Hi Peter, The node ID maybe a bit difficult, since they may be generated with different node naming sequencies. I call the file data through an independant function, the function input is X, Y, Z coordinate and output is coordinate pressure value. This function will be called directly from the user ...
by JamesMarine
07 Jul 2020, 18:55
Forum: ElmerSolver
Topic: Complicate Noise Source Input in Acoustic Analysis
Replies: 12
Views: 138

Re: Complicate Noise Source Input in Acoustic Analysis

Thanks to your kind help, i wrote the attached example user functions and try to assign different acoustic pressure loads to node points. I am sorry but i have below additional questions: 1. It seems body force user functions is relatively simple, but i assume body forces can only be applied to a bo...
by JamesMarine
29 Jun 2020, 19:10
Forum: ElmerSolver
Topic: Complicate Noise Source Input in Acoustic Analysis
Replies: 12
Views: 138

Re: Complicate Noise Source Input in Acoustic Analysis

I noted in the models manual it mentioned the use of pressure body forces is rather seldom, is there any differences between body forces or boundary conditions? In previous simulations, i just used boundary conditions such as wave flux or pressure etc? I now already have noirse source in terms of dB...
by JamesMarine
28 Jun 2020, 09:37
Forum: ElmerSolver
Topic: Complicate Noise Source Input in Acoustic Analysis
Replies: 12
Views: 138

Re: Complicate Noise Source Input in Acoustic Analysis

Many thanks for the kind help, Peter. By meaning UDF, do you mean that writing a .f90 file and compile it as an solver? Or just write some functions within the .sif file? What i am trying to do is to assign differnt pressure wave values on differnts nodes. Very sorry that I am a starter of UDF and i...
by JamesMarine
27 Jun 2020, 03:14
Forum: ElmerSolver
Topic: Complicate Noise Source Input in Acoustic Analysis
Replies: 12
Views: 138

Re: Complicate Noise Source Input in Acoustic Analysis

Hi Peter, many thanks for the kind response! I am thinking to associate the source item with discrete nodes. Do you have any kind suggestions on how this can be done? Hi Yes, the Helmholtz solver looks for source terms named "Pressure Source 1" and "... 2" in Body Force section. Just create your own...
by JamesMarine
26 Jun 2020, 19:41
Forum: ElmerSolver
Topic: Complicate Noise Source Input in Acoustic Analysis
Replies: 12
Views: 138

Complicate Noise Source Input in Acoustic Analysis

Is that possible to include relevant complicate noise sources in acoustic analysises in Elemer? For example, noise sources calculated from pressure field or monopole source / Dipole source / Quadrupole source?

Is there any examples on this?
by JamesMarine
05 Jun 2020, 11:12
Forum: ElmerSolver
Topic: Structure Analysis with both Beam and Shell elments
Replies: 16
Views: 954

Re: Structure Analysis with both Beam and Shell elments

Mika, if you don't mind, i have another question regarding shell/beam coupled solvers: does our beam solver support asymmetric beam properties? As you may understand, beam with asymmetric properties is quite common. Thanks for testing, As an update I mention that partially nonlinear analysis can now...
by JamesMarine
05 Jun 2020, 06:46
Forum: ElmerSolver
Topic: Flutter Analysis using Elmer
Replies: 2
Views: 108

Flutter Analysis using Elmer

I am trying to swith from NASTRAN to elmer regarding structure analysis. I am wondering whether Elmer is capable of carrying out flutter analysis of aero-structures.

Is there any materials that I can refer to for this kind of analysis?
by JamesMarine
20 May 2020, 12:29
Forum: ElmerSolver
Topic: Structure Analysis with both Beam and Shell elments
Replies: 16
Views: 954

Re: Structure Analysis with both Beam and Shell elments

Thanks for testing, As an update I mention that partially nonlinear analysis can now be done with "Large Deflection = True". At the moment the beam sections can nevertheless add only linearly behaving stiffness to the combined model, so the nonlinearity arises from the shell part. -- Mika Many than...