{"id":312962,"date":"2023-10-24T06:33:15","date_gmt":"2023-10-24T06:33:15","guid":{"rendered":"\/forum\/forums\/reply\/312962\/"},"modified":"2023-10-24T06:36:38","modified_gmt":"2023-10-24T06:36:38","slug":"312962","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/312962\/","title":{"rendered":"Reply To: Implement of constraints between two objects in frequency-domain calculations"},"content":{"rendered":"<p>&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;Hi Mike&lt;\/p&gt;&lt;p&gt;&nbsp; &nbsp; Thanks for your reply. I&rsquo;m worried about the calculation of the radiation loads. Although the constraints are established between two objects, the added mass and radiation damping coefficients are still obtained by exerting objects&rsquo; forced motion. The forced motion would cause narrow gap resonance phenomena. For exmaple, in the surge direction, the outer object is fixed and the inner object moves in a harmonic motion with unit amplitude. This will overestimate the radiation waves in the gap and cause strange peaks around resonant frequency in added mass and radiation damping. But in physics, such singular peaks do not exist due to constraints between two objects.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/10\/24-10-2023-1698128604-mceclip0.png\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/10\/24-10-2023-1698128675-mceclip2.png\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/10\/24-10-2023-1698128692-mceclip3.png\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/10\/24-10-2023-1698128756-mceclip4.png\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/10\/24-10-2023-1698128851-mceclip5.png\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/10\/24-10-2023-1698129085-mceclip6.png\" \/>&lt;\/p&gt;&lt;p&gt;The incorrect radiation damping coefficients gererate the incorrect radiation impulse response function when convolution integral is activated. I&rsquo;m worried that this will affect the time domain calculations. How AQWA solved the problem?&lt;\/p&gt;&lt;p&gt;Best regards,&lt;\/p&gt;&lt;p&gt;Tianyuan&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-312962","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi Mike Thanks for your reply. I\u2019m worried about the calculation of the radiation loads. Although the constraints are established between two objects, the added mass and radiation damping coefficients are still obtained by exerting objects\u2019 forced motion. The forced motion would cause narrow gap resonance phenomena. For exmaple, in the surge direction, the\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/312962\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Reply To: Implement of constraints between two objects in frequency-domain calculations | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hi Mike Thanks for your reply. I\u2019m worried about the calculation of the radiation loads. Although the constraints are established between two objects, the added mass and radiation damping coefficients are still obtained by exerting objects\u2019 forced motion. The forced motion would cause narrow gap resonance phenomena. 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I\u2019m worried about the calculation of the radiation loads. Although the constraints are established between two objects, the added mass and radiation damping coefficients are still obtained by exerting objects\u2019 forced motion. The forced motion would cause narrow gap resonance phenomena. 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I\\u2019m worried about the calculation of the radiation loads. Although the constraints are established between two objects, the added mass and radiation damping coefficients are still obtained by exerting objects\\u2019 forced motion. The forced motion would cause narrow gap resonance phenomena. 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I\u2019m worried about the calculation of the radiation loads. Although the constraints are established between two objects, the added mass and radiation damping coefficients are still obtained by exerting objects\u2019 forced motion. The forced motion would cause narrow gap resonance phenomena. 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I\u2019m worried about the calculation of the radiation loads. Although the constraints are established between two objects, the added mass and radiation damping coefficients are still obtained by exerting objects\u2019 forced motion. The forced motion would cause narrow gap resonance phenomena. For exmaple, in the surge direction, the","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/312962\/#breadcrumblist"},"datePublished":"2023-10-24T06:33:15+00:00","dateModified":"2023-10-24T06:36:38+00:00"},{"@type":"WebSite","@id":"https:\/\/innovationspace.ansys.com\/forum\/#website","url":"https:\/\/innovationspace.ansys.com\/forum\/","name":"Ansys Learning Forum","description":"Ansys Innovation Space","inLanguage":"en-US","publisher":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#organization"}}]},"og:locale":"en_US","og:site_name":"Ansys Learning Forum | Ansys Innovation Space","og:type":"article","og:title":"Reply To: Implement of constraints between two objects in frequency-domain calculations | Ansys Learning Forum","og:description":"Hi Mike Thanks for your reply. I\u2019m worried about the calculation of the radiation loads. 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