Learning Forum

[noycepm]

I currently have this 3D Harmonic Acoustics model setup, I am wondering if it is possible to recreate this model in an equivalent 2D space by just taking the top face? I know this is not possible with the Harmonic Acoustics system, so what would be the equivalent?

[Erik Kostson]

 

 

 

Hi

2D harmonic acoustics can be carried out using the coupled field harmonic system in workbench (not sure if all possible BC are available as it is beta - TL plot does not work as should).

As it (2D) is beta I would suggest to do this in 3D (use only one element through thickness - as shown in the link below).

I said in your previous post, which I replied to, 

we do not have such an example in our topics in acoustics course in AIS unfortunetaly, but 

there is a very good example on how to run this type of analysis (it is based on an older acoustic extension which we do not use, but the principle, all BC and loads are the same as in newer versions).

https://simutechgroup.com/acoustic-simulation-of-a-silencer/

All the best

Erik

 

 

 

[noycepm]

Hi there, this is great thank you. So would I physically design my geometry to be one cell thick so what ever I set my element size to be, that will be the thickness? Also would this work with a circular cross section?

[Erik Kostson]

Hi

No worries - happy it helped.

I think yes you could have it as you say perhaps - not sure if it works for all the cross sections (I think the tutorial is for a square / rect. I believe).

All the best

Erik

[noycepm]

Yes I would assume it would not be possible for circular cross sections but that's ok. I am currently trying to figure out this transfer admittance matrix. I have realised I have to create a trim element with ports on either side so I have done that but I can't seem to figure out how to setup the material. From the tutorial they specify using steel but that can't be assigned to the acoustic region so how do I make this trim element work?

[noycepm]

Hi there, so I am having another issue, my transfer admittance matrix is not working for this geometry, I was hoping to be able to set the inner surfaces as one port and the outer surfaces as another but that won't work. Is there anything I can do?

[Erik Kostson]

Hi

We do not have any examples of that.

There is a very good video explaining how this type of object can be used:

https://www.youtube.com/watch?v=umHEM7dESeU

Hope this helps

Erik

[noycepm]

I have tried to recreate their model in the first tutorial, and I am getting this error, do you know what it means?

[Erik Kostson]

Not sure - please open up a new topic as this is now related to the DMP solver. 

Closing this topic, as it might be useful to others (say how to do a 2D acoustic anlaysis, etc.)

All the best

Erik