Acoustic-Solid Interaction Coupling
Posted May 29, 2024, 3:54 p.m. EDT Structural & Acoustics, Acoustics & Vibrations, Structural Mechanics Version 6.2 5 Replies
Please login with a confirmed email address before reporting spam
Hello,
I'm currently working with a model in the Acoustic-Solid Interaction, Frequency Domain Interface, but I'm having issues with coupling two air domains through a solid interlayer (steel). I've incorporated the acoustic-structure boundary, but it seems that the pressure acoustic domains are not talking to each other. This issue does not arise when I model the interlayer membrane using the Pressure Acoustics module, and only occurs when I have the interlayer under Solid Mechanics.
I've tried to change the thickness of the membrane (also have tried using Thin Layer and Membrane interfaces) and the material (tried using Wood) to no avail, and it just seems like I can't get the air cavities in my model to couple in the z-direction.
Any advice would be appreciated.
Best, Jeffrey
Attachments:
Please login with a confirmed email address before reporting spam
There is an eigenfrequency analysis with solid mechanics disabled in the file. So you are just getting the acoustic modes for each of the two domains. Do you have a file that fits with the problem that you describe (Frequency Domain analysis)?
-------------------René Christensen, PhD
Acculution ApS
www.acculution.com
info@acculution.com
Please login with a confirmed email address before reporting spam
Hi René,
Thank you so much for the reply! I disabled the Solid Mechanics in the Eigenfrequency Study because I don't want to search for pressure modes/eigenvalues within the steel or wood. I'm only searching for the eigensolutions within the air cavities of my model. I've updated my file so that this can be illustrated more clearly.
My issue currently is that when I have the wood interlayer membrane (labeled domain 3) under Solid Mechanics, the coupling between the two layers doesn't seem to register. I've attached two screenshots, showing what I expect (and get when I select the interlayer domain under Pressure Acoustics instead) vs. what I get (interlayer under Solid Mechanics). I thought that the Acoustic-Structure boundary would properly couple the two domains, but it doesn't seem to be operating as expected. I'm wondering if there's something wrong with my modeling strategy that is resulting in this issue.
Also, would it change anything to select the interlayer domain under both Pressure Acoustics and Solid Mechanics?
Please let me know if my problem is still unclear.
Best, Jeffrey
Attachments:
Please login with a confirmed email address before reporting spam
Again, your file is set up in a way that only includes acoustic modes, and not the actual problem that you are having. Are you interested in having the coupling present when solving an eigenmode analysis or a frequency sweep? If you enable structural mechanics and acoustics and you have a Multiphysics coupling, the coupling should be there.
-------------------René Christensen, PhD
Acculution ApS
www.acculution.com
info@acculution.com
Please login with a confirmed email address before reporting spam
Hi René,
Thanks again for your reply. When I enable both solid mechanics and presssure acoustics in the study, it does not properly account for the coupling. I've tried this multiple times. I always have the multiphysics coupling enabled. This is why I am stuck. It should be clear if you enable it in my COMSOL file, but if not apologies for the confusion. I'm hoping to both solve an eigenmode analysis and frequency sweep, although the current file only includes the eigenfrequency study.
Please let me know if my issue is still not clear.
Jeffrey
Please login with a confirmed email address before reporting spam
If you solve the Eigenfrequency problem with Pressure Acoustics, Solid Mechanics, and Acoustic-Structure Boundary all enabled, you can compute the coupled natural frequencies and mode shapes. The Acoustic-Structure Boundary is showing (correctly) the boundaries for which the multiphysics is enforced.
It seems you are not getting an expected result - but this could be due to other issues instead of the multiphsyics coupling. For example, check the mesh - is this resolving the mode shape? It looks like the Young's modulus for American red oak is set to 1 Pa. Is this correct? This is very soft and will result in very slow wave speeds. Keep in mind that if you solve Domain 3 with Pressure Acoustics, along with a different physics assumption, it will utilize different material properites (speed of sound and density) compared to if the domain is solved with Solid Mechanics.
-Mark
Reply
Please read the discussion forum rules before posting.
Discussion Forum Rules and Guidelines
The goal of COMSOL Access is to provide a forum for you to communicate effectively with COMSOL as well as your colleagues within the multiphysics simulation community. This involves providing you with access to technical support and downloads of the latest {:comsol} software releases, as well as the ability to share your comments and work with other users of the {:comsol} software through forums such as the blog, discussion forum, and Application Exchange. In order to make this an efficient and pleasant experience for you and other members of COMSOL Access, we ask that you follow a few rules and guidelines.
When registering for COMSOL Access, you agree to provide your complete and truthful information for all fields requested on your COMSOL Access account registration page. You also agree to maintain the accuracy of all information associated with you on your COMSOL Access account. You agree to maintain your COMSOL Access account for use solely by you, not to share your username and password with anyone else, and to take appropriate precautions to restrict access to your username and password from others. Furthermore, you agree not to submit any information relating to your employer through your COMSOL Access account without your employer’s authorization. Should you use a COMSOL Access account associated with an employer, you agree to immediately discontinue using that account upon termination of that employment.
The moderators of the forums will remove any generally objectionable material as quickly as possible. You acknowledge that all posts made to these forums express the views and opinions of the author and not the administrators, moderators, or webmaster (except for posts by these people). Hence, they will not be held liable.
You agree not to post or link to any material that is abusive, obscene, vulgar, slanderous, hateful, threatening, sexually oriented, or that infringes upon or violates any third-party rights or any other material that may violate any applicable laws. You agree that you will not otherwise use your COMSOL Access account to violate or to assist anyone in violating any law. Engaging in any activity in violation of these COMSOL Access rules and guidelines may lead to you being immediately and permanently banned from COMSOL Access. The IP address of all posts is recorded to aid in enforcing these conditions. You agree that the webmaster, administrator, and moderators of the forums have the right to remove, move, or close any topic at any time as they see fit. As a user of COMSOL Access, you agree to any information you have entered into any of the forums being stored in a database.
You agree that you will not use your COMSOL Access account in violation of any applicable export control laws. You represent and warrant that you are not subject to any comprehensive sanction or embargo by the U.S. or any other country, nor are you identified on any list maintained by the U.S. government that identifies persons for which the U.S. maintains restrictions. Further, you represent and warrant that you are not subject to any restriction on the receipt of technology or products under the export control laws of the U.S. or any other country.
Basic Rules
- Flaming: Do not post any messages that harass, insult, belittle, threaten, or flame another member or guest. Debates are fine, but argue with the point, not the person.
- Trolling: Do not post with the purpose of starting a dispute. Note that a person disagreeing with your opinion is not considered trolling; keep it civil, even if you are sure that the other person is wrong. Anything seen as trolling will result in you being banned.
- Spamming: Posts without content or containing nonsense waste space and everyone's time. Spam will be removed from the forum.
- Offensive Posts, Links or Images: Do not use profanity, racial, ethnic, religious, or other slurs or any other offensive material.
- Advertising: Posting of advertisements for products or services, links to auctions, affiliate links, links to promote websites, and so forth is not allowed.
- Disclosure of Personal Information: Do not disclose any other member's email, real name, address, phone number, IP address, or other personal information. This includes posting contents of emails and private messages without the sender's consent. Do not bring personal disputes into the forums. Bans and warnings issued to other users are considered personal information.
- Misleading Titles: The subject line of the post should be as informative as possible about the content of the post. This also reduces the amount of duplicate posts.
- Thread Hijacking: Taking a thread off-topic to pursue one's own agenda is not permitted.
- Piracy: Do not upload, post, email, transmit, or otherwise make available any content that infringes upon any patent, trademark, trade secret, copyright, or other proprietary rights ("Rights") of any party. This includes COMSOL model files created by a forged or illegitimate license.
- Honesty: Users must provide truthful information in creating their COMSOL Access account.
These rules are subject to change. The moderators reserve the right to remove, edit, or move posts at their discretion. The COMSOL Access administrators will reserve the right to permanently remove a user account without notice if any of the rules are not followed. Particular services accessible with your COMSOL Access account may be subject to additional rules. You agree to comply with all rules applicable to each service you access through your COMSOL Access account.
Posting Guidelines
When posting, understand that you are trying to communicate with other people. Although many COMSOL Access members are not fluent in English, the official language of this forum is English.
Here are some important guidelines of language:
- Write in English.
- If you are familiar with LaTeX, please use this to write mathematical equations.
- Always do a quick check for spelling/grammar mistakes.
- Format your post in a legible manner. Use the Preview button often.
- Be concise and articulate as much as possible.
- Use the Enter key to create paragraphs.
- Capitalize correctly. It is difficult to read posts that are written entirely in uppercase or lowercase.
- Use correct punctuation. Avoid run-on sentences.
- Try to avoid using “text speak”, “net speak”, or slang. The purpose of language is to be understood.
- Never invent acronyms and use as few acronyms as possible. For example, write "COMSOL Multiphysics" and not "CMP".
- Review your post before publishing it. Try to catch typos.
- Please check to see if a topic has already been posted. Do not post multiple threads on the same topic.
Disclaimer
By submitting content to the forums, you hereby grant COMSOL a nonexclusive, royalty-free, perpetual, worldwide, and unrestricted license to reproduce, publicly display, publicly distribute, and prepare derivative works of the content. COMSOL hereby grants you a license to copy and/or use content from the forums solely for your own internal purposes. COMSOL provides the forum service for the benefit of our users to share content with the community. All content is provided "as is" without warranty of any kind, express or implied, including without limitation, warranties of merchantability, noninfringement, design, operation, and fitness for a particular purpose, and the entire risk as to the quality and performance of the programs is with you.
Neither COMSOL, the authors, nor the copyright owners of submitted materials warrant that the programs will be error-free, uninterrupted, virus-free, secure, and suitable for your needs, produce specific results, or that errors or failures will be corrected. Comments on supplied content should be sent to the author or copyright owner through the tools provided in the forums.
Please log in to post a reply.
Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.
Suggested Content
- BLOG Introduction to Modeling Acoustic-Structure Interactions in COMSOL®
- KNOWLEDGE BASE Error: Failed to Connect to Solid Edge
- FORUM Acoustic-Structure Interaction Time Dependent Computational Cost Reduction Advice
- FORUM Use of the Acoustic-Shell interaction module
- FORUM coupling vibration of a plate and acoustic