Acoustic simulation : CAABSF/PAASF assignment

Vikrant
Vikrant Altair Community Member
edited October 2020 in Community Q&A

Hello,

I have modelled air around the housing. These structural and fluids are coupled by ACMODL Card. I want to define non-reflecting boundary. for that I have defined PAABSF and referenced to CAABSF. But I dont know how to assign CAABSF to Elements. 

Thanks in advance.

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Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited June 2019

    The CAABSF element must connect entirely to fluid points on the fluid-structure boundary. Card edit option would help you to assign CAABSF eleements

    <?xml version="1.0" encoding="UTF-8"?>Acoustic.JPG

    <?xml version="1.0" encoding="UTF-8"?>Card edit.JPG

  • Vikrant
    Vikrant Altair Community Member
    edited June 2019

    Thanks Rahul for your Reply.

    But I get some different options. 

     

    <?xml version="1.0" encoding="UTF-8"?>elemedit.thumb.png.8e7b01a614c21b1daf278fb3618f39fb.png

     

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited June 2019

    set  type of element config as quad4 then second option contain will give CAABSF.

  • Vikrant
    Vikrant Altair Community Member
    edited June 2019

    Okay, I found it Rahul. 
    Thanks a lot. 

     

  • Vikrant
    Vikrant Altair Community Member
    edited June 2019
    Altair Forum User said:

    Okay, I found it Rahul. 
    Thanks a lot. 

     

    Instead applying only on the fluid structure boundary, I have kept elem type as a CAABSF on all fluid Elements. 
    Is that fine?

     

  • Vikrant
    Vikrant Altair Community Member
    edited June 2019

    Hi, Rahul, 

    I am done with modelling of the fluid structural coupling Problem. 
    I have attached file. could you please check it once.

    Bauteil1,2 and platte - structural components
    Air - fluid (At the end non reflecting boundary)

    Please check if PAABSF and CAABSF are correctly defined or not.

    Thanks a lot.

     

    Regards,

    Vikrant

    Unable to find an attachment - read this blog

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