{"id":445915,"date":"2025-11-07T19:03:30","date_gmt":"2025-11-07T19:03:30","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/icfd-simulation-behaved-like-the-fluid-does-not-exist\/"},"modified":"2025-11-07T19:03:30","modified_gmt":"2025-11-07T19:03:30","slug":"icfd-simulation-behaved-like-the-fluid-does-not-exist","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/icfd-simulation-behaved-like-the-fluid-does-not-exist\/","title":{"rendered":"ICFD simulation behaved like the fluid does not exist"},"content":{"rendered":"<p>&lt;p style=&#8221;language: en-SE; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0in; text-align: justify; text-justify: inter-ideograph; direction: ltr; unicode-bidi: embed; mso-line-break-override: none; word-break: normal; punctuation-wrap: hanging;&#8221;&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: normal; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt;Hi Dear Support,&lt;\/span&gt;&lt;\/p&gt;&lt;p style=&#8221;language: en-SE; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0in; text-align: justify; text-justify: inter-ideograph; direction: ltr; unicode-bidi: embed; mso-line-break-override: none; word-break: normal; punctuation-wrap: hanging;&#8221;&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: normal; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt;I am simulating an ellipse (structure) with a fluid core in LS-DYNA. I used&nbsp;ICFD to model fluid core with *ICFD&lt;\/span&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: bold; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt;_&lt;\/span&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: normal; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt;BOUNDARY&lt;\/span&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: bold; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt;_&lt;\/span&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: normal; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt;NONSLIP. The structure was solved using explicit solver while the fluid was solved using &lt;\/span&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: normal; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt;implict&lt;\/span&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: normal; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt; solver. They were coupled using *ICFD&lt;\/span&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: bold; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt;_&lt;\/span&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: normal; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt;CONTROL&lt;\/span&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: bold; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt;_&lt;\/span&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: normal; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt;FSI with two-way coupling (i.e., OWC = 0)&lt;\/span&gt;&lt;\/p&gt;&lt;p style=&#8221;language: en-SE; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0in; text-align: justify; text-justify: inter-ideograph; direction: ltr; unicode-bidi: embed; mso-line-break-override: none; word-break: normal; punctuation-wrap: hanging;&#8221;&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: normal; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt;The results looked &lt;\/span&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: normal; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt;similar to&lt;\/span&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: normal; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt; another simulation that the fluid is not &lt;\/span&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: normal; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt;presetned&lt;\/span&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: normal; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt; (i.e., &lt;\/span&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: normal; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt;an&lt;\/span&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: normal; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt; purely explicit &lt;\/span&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: normal; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt;simuation&lt;\/span&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: normal; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt;). Could I instruct me what I could do wrong in the simulation with ICFD? What should I check to debug? Any discussion and suggestion are highly appreciated.&nbsp;&lt;\/span&gt;&lt;\/p&gt;&lt;p style=&#8221;language: en-SE; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0in; text-align: justify; text-justify: inter-ideograph; direction: ltr; unicode-bidi: embed; mso-line-break-override: none; word-break: normal; punctuation-wrap: hanging;&#8221;&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: normal; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt;Also happy to share my k files if needed and interested.&lt;\/span&gt;&lt;\/p&gt;&lt;p style=&#8221;language: en-SE; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0in; text-align: justify; text-justify: inter-ideograph; direction: ltr; unicode-bidi: embed; mso-line-break-override: none; word-break: normal; punctuation-wrap: hanging;&#8221;&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: normal; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt;Best,&lt;\/span&gt;&lt;\/p&gt;&lt;p style=&#8221;language: en-SE; margin-top: 0pt; margin-bottom: 0pt; margin-left: 0in; text-align: justify; text-justify: inter-ideograph; direction: ltr; unicode-bidi: embed; mso-line-break-override: none; word-break: normal; punctuation-wrap: hanging;&#8221;&gt;&lt;span style=&#8221;font-size: 18.0pt; font-family: &#8216;Times New Roman&#8217;; mso-ascii-font-family: &#8216;Times New Roman&#8217;; mso-fareast-font-family: +mn-ea; mso-bidi-font-family: +mn-cs; mso-fareast-theme-font: minor-fareast; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; font-weight: normal; font-style: normal; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;&#8221;&gt;Zhou&lt;\/span&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/11\/07-11-2025-1762542198-Picture1.jpg\" alt=\"\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-445915","topic","type-topic","status-publish","hentry","topic-tag-icfd-1"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/icfd-simulation-behaved-like-the-fluid-does-not-exist\/\" \/>\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=\"ICFD simulation behaved like the fluid does not exist | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:url\" 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