[Archived phorum post from squ1.com v2 by Clarice]
Hi Everybody,
I just would like to check one thing:
Does surface normal interfere in acoustic rays & particles calculation?
I mean do I have to set the surface normals of the zone all pointing outside to get acoustic calc results correct or this is really not important in this procedure, just used for thermal and solar calcs?
Thanks in advance for the help
Regards,
Clarice
Re: Surface normals
[Archived phorum post from squ1.com v2 by Olivier]
Clarice,
My first thought was that it would matter if the assembly is not homogeneous: when the assembly is, for example, cork on the inside and concrete on the outside, if the normal is reversed, then i was thinking that the cork becomes the outside element while the concrete becomes the interior element. But that is not what I think happens, as I think the calculation are based on the data you enter for the entire assembly in the Acoustic Data window only, so it might not matter.
I am really not sure on that.
Olivier
Re: Surface normals
[Archived phorum post from squ1.com v2 by Andrew]
Hi Olivier,
You're spot on, there is only one set of absoprtion co-efficients for each material so, irrespective of which side is hit, the absorption is the same.
I have been playing with diffusion coefficients based on the roughness value in the material settings - which should be side-sensitive - however this will not make it into v5.50 as it is still experimental and the results have not been validated properly.
Hope that helps...
Regards,
Andrew
Dr. Andrew Marsh
Square One research Pty Ltd
Re: Surface normals
[Archived phorum post from squ1.com v2 by Ben Hall]
Looking forward to seeing what you can do with predicting diffusion!!! It would be most helpful in studio design.
At the moment we design mostly by experience when it comes to diffusion (short of boundary element analysis...)
Ben.