{"id":367054,"date":"2024-05-16T09:22:01","date_gmt":"2024-05-16T09:22:01","guid":{"rendered":"\/forum\/forums\/topic\/fsi-simulation-of-ascending-aorta\/"},"modified":"2024-05-16T09:22:01","modified_gmt":"2024-05-16T09:22:01","slug":"fsi-simulation-of-ascending-aorta","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fsi-simulation-of-ascending-aorta\/","title":{"rendered":"FSI simulation of ascending aorta"},"content":{"rendered":"<p>Hello to everyone,&nbsp;<\/p>\n<p>I am running FSI for ascending thoracic aortic aortic aneurysm. The issue I am experiencing is the display of reverse flow in fluent until a large time step in 100% of the outlet areas. The simulation is running for 0.8 seconds. I use a time step size of 0.001 seconds. The analysis shows reverse flow until 0.13 seconds for supra aortic vessels and until 0.15 seconds for the outlet in the descending part. After that it runs normally.&nbsp;<br \/>I&#8217;m using a hyperelastic model. When I&#8217;m running with stiffer models or even with elastic model I don&#8217;t face this issue. When I&#8217;m running with a hyperelastic, however, it occurs.<br \/>First I would like to ask if this is a serious problem, and if so, how can I solve it?<\/p>\n<p>Thank you,<br \/>Antonis<\/p>\n","protected":false},"template":"","class_list":["post-367054","topic","type-topic","status-closed","hentry","topic-tag-fluent-cfd-ansys-1","topic-tag-fsi-transient-1"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello to everyone, I am running FSI for ascending thoracic aortic aortic aneurysm. The issue I am experiencing is the display of reverse flow in fluent until a large time step in 100% of the outlet areas. The simulation is running for 0.8 seconds. I use a time step size of 0.001 seconds. The analysis shows\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fsi-simulation-of-ascending-aorta\/\" \/>\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=\"FSI simulation of ascending aorta | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hello to everyone, I am running FSI for ascending thoracic aortic aortic aneurysm. The issue I am experiencing is the display of reverse flow in fluent until a large time step in 100% of the outlet areas. The simulation is running for 0.8 seconds. I use a time step size of 0.001 seconds. 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The analysis shows\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/fsi-simulation-of-ascending-aorta\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/#fluent-#cfd-#ansys-1\\\/#listItem\",\"name\":\"#fluent-#cfd-#ansys\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/#fluent-#cfd-#ansys-1\\\/#listItem\",\"position\":3,\"name\":\"#fluent-#cfd-#ansys\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/#fluent-#cfd-#ansys-1\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/fsi-simulation-of-ascending-aorta\\\/#listItem\",\"name\":\"FSI simulation of ascending aorta\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/fsi-simulation-of-ascending-aorta\\\/#listItem\",\"position\":4,\"name\":\"FSI simulation of ascending aorta\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/#fluent-#cfd-#ansys-1\\\/#listItem\",\"name\":\"#fluent-#cfd-#ansys\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/fsi-simulation-of-ascending-aorta\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/fsi-simulation-of-ascending-aorta\\\/\",\"name\":\"FSI simulation of ascending aorta | Ansys Learning Forum\",\"description\":\"Hello to everyone, I am running FSI for ascending thoracic aortic aortic aneurysm. The issue I am experiencing is the display of reverse flow in fluent until a large time step in 100% of the outlet areas. The simulation is running for 0.8 seconds. I use a time step size of 0.001 seconds. 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