Learning Forum

[Lars Wiesweg]

Hi,

I have the following Problem:

My only  boundary condition is a surface velocity of 1m/s for a frequency range from 0 to 500Hz in 10 steps, and the fluid is  air. 

But my output of the frequency response on the same surface is 0.833-0.877m/s. What did Iwrong? And what can i do to avoid the error ?

If there is no Element behind the surface, the frequency response is 1m/s.

 

Here is a link to get the files for Ansys:

https://we.tl/t-K4hFG4LjMf

 

 

Thanks for help!

[Federico]

Hello Lars, 

I cannot click your link. I'm not sure I understand your question. 

Can you clarify what you are showing and what the issue is?

[Lars Wiesweg]

Hi Federico, thanks for the response. Does the link work with copy and paste? It contains the .sat files of 2 simulation models. It's supposed to be a simple model of a speaker for developing an impedance measuring device. The actual model is more complex. I've gradually reduced it to pinpoint where the error might be. I'm concerned that the boundary condition isn't being applied correctly. To check this, I'm setting a surface velocity of one meter per second on the membrane and examining the simulated velocity output at the boundary surface. This works satisfactorily for the LS file but not for the LS2 file. I hope the issue is clearer now, but feel free to ask further questions if needed. Regards, Lars

[Federico]

As as part of our Forum policy, we cannot download files or click through links when responding to a thread.

Please add screenshots of your model in your post to describe the issue.