Increased number of particles lost in meshing problem and Improper calculation in surface receivers

[marir...@gmail.com]

Hi all,

We are trying to run a model(Dimension: 36mx15mx11m) made with CAD software in isimpa with sound source of around 20 and the same we want to define with the fitting zones also to consider the diffusion characteristics. We tried running 1 million particles and so on. The following problems we noted and needed suggestions and help to rectify that,

i.  A huge number of particles (around millions)got lost by meshing problems

ii. And the surface receiver cutting the particular room only doesn't produce the results in the whole plane, only a few areas outside of the particular room produce the result and showing the sound level gradient. Other areas were empty. When we increased the number of particles to 2 million, we could see some patches in some area of the surface receivers.

iii. It was throwing an error in the console saying that 'Error:Calculation code error:Warning 3240837l particles has been in error on 4513350l particles. The computation result may be wrong, please check the particles statitics file for more details.'

The cumulative effect of all the problems making the punctual receiver's values infinity in most places and provide unreliable sound level results. 

Please guide us in sorting out these issues.

[nico....@gmail.com]

Hi,

It maybe a misplacement of a sound source regarding the location of the meshing tetrahedra. So you can try to move the sound source by some millimetres in order to solve the issue.

best regards,

Nicolas Fortin

[marir...@gmail.com]

Hi,

Thank you Nicolas for the support.

The issue of wrong prediction results has been sorted out. I have kept the fitting zone very close to the walls at 0.25 m, so the calculation went wrong. 

Now it resolved when I kept at 0.5 m. Seems like it is not taking decimal places into account in the calculation.

And still the problem of "Error:Calculation code error:Warning 3240837l particles has been in error on 4513350l particles. The computation result may be wrong, please check the particles statitics file for more details" exists.

What is the reason for this warning message and what it meant in the calculation? And also, How is the number of particles in the above calculated?

Regards,

Mariselvan Pragadeeswaran