{"id":160152,"date":"2022-09-26T10:00:43","date_gmt":"2022-09-26T10:00:43","guid":{"rendered":"\/knowledge\/forums\/topic\/discovery-aim-tutorial-flow-over-an-ahmed-body\/"},"modified":"2023-08-16T06:33:36","modified_gmt":"2023-08-16T06:33:36","slug":"discovery-aim-tutorial-flow-over-an-ahmed-body","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/discovery-aim-tutorial-flow-over-an-ahmed-body\/","title":{"rendered":"Discovery AIM tutorial &#8211; Flow over an Ahmed Body"},"content":{"rendered":"<p><strong>This example is\u00a0taken from\u00a0<u><a href=\"https:\/\/confluence.cornell.edu\/display\/SIMULATION\/ANSYS+AIM+-+Flow+over+an+Ahmed+Body\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">Cornell University&#8217;s ANSYS AIM Learning Modules<\/a><\/u><\/strong><\/p>\n<hr \/>\n<nav class=\"toc -selected\">Contents<\/p>\n<ol class=\"toc__section -lev0\">\n<li class=\"toc__item -lev0\">Problem Specification<\/li>\n<li class=\"toc__item -lev0\">Geometry<\/li>\n<li class=\"toc__item -lev0\">Mesh<\/li>\n<li class=\"toc__item -lev0\">Physics Setup<\/li>\n<li class=\"toc__item -lev0\">Results<\/li>\n<li class=\"toc__item -lev0\">Validation<\/li>\n<\/ol>\n<\/nav>\n<h4 content_id=\"problem-specification\" class=\"toc__permalink\" content_id=\"problem-specification\" class=\"toc__permalink\"  id=\"PROBLEM-SPECIFICATION\"><strong>Problem Specification<\/strong><\/h4>\n<p>The Ahmed Body is a standard wind tunnel model used to represent ground vehicles. It was first defined and characterized by S.R. Ahmed in 1984 and has been used since to study the effects of drag and aspect ratio. Below is the blueprint definition of an Ahmed body.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-157279\" src=\"\/knowledge\/wp-content\/uploads\/sites\/4\/2022\/08\/HG202.png\" alt=\" width=\"787\" height=\"352\" \/><\/p>\n<p>In this tutorial, we will subject an Ahmed body to air at 40 m\/s in order to find the velocity vectors, pressures on the body, and streamlines around the body.<\/p>\n<hr \/>\n<h4 content_id=\"geometry\" class=\"toc__permalink\" content_id=\"geometry\" class=\"toc__permalink\"  id=\"GEOMETRY\"><strong>Geometry<\/strong><\/h4>\n<p>In this video, you will learn to import the geometry and create an Enclosure for analysis.<\/p>\n<p><iframe loading=\"lazy\" class=\"vidyard_iframe\" src=\"https:\/\/play.vidyard.com\/S6n8bKwuzMLYk8chQzfpSM.html?v=3.1.1&amp;\" width=\"700\" height=\"400\" frameborder=\"0\" scrolling=\"no\" allowfullscreen=\"allowfullscreen\" data-mce-fragment=\"1\"><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<hr \/>\n<h4 content_id=\"mesh\" class=\"toc__permalink\" content_id=\"mesh\" class=\"toc__permalink\"  id=\"MESH\"><strong>Mesh<\/strong><\/h4>\n<p>In this\u00a0example, we will be using\u00a0<strong>Automatic\u00a0Physics-Aware Meshing<\/strong>.\u00a0Automatic physics-aware meshing helps automate and simplify your problem setup. With automatic physics-aware meshing, the computational mesh is generated automatically based on the solution fidelity setting and the\u00a0physics inputs.<\/p>\n<hr \/>\n<h4 content_id=\"physics-setup\" class=\"toc__permalink\" content_id=\"physics-setup\" class=\"toc__permalink\"  id=\"PHYSICS-SETUP\"><strong>Physics Setup<\/strong><\/h4>\n<p>This video shows how to set up boundary conditions to the fluid volume. One of the faces of the Fluid\u00a0volume is given symmetry boundary condition and other faces apart from the Inlet and Outlet are given as Openings.<\/p>\n<p><iframe loading=\"lazy\" class=\"vidyard_iframe\" src=\"https:\/\/play.vidyard.com\/vWEc9YrpBtyFLzi6HyzWEW.html?v=3.1.1&amp;\" width=\"700\" height=\"400\" frameborder=\"0\" scrolling=\"no\" allowfullscreen=\"allowfullscreen\" data-mce-fragment=\"1\"><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<hr \/>\n<h4 content_id=\"results\" class=\"toc__permalink\" content_id=\"results\" class=\"toc__permalink\"  id=\"RESULTS\"><strong>Results<\/strong><\/h4>\n<p>In this video, we will learn to generate results in the form of\u00a0 Velocity Vector, Pressure contours and we will also generate Streamlines for the Ahmed Body.<\/p>\n<p><iframe loading=\"lazy\" class=\"vidyard_iframe\" src=\"https:\/\/play.vidyard.com\/6NAnBraXMaUbQgZg3iy4Qh.html?v=3.1.1&amp;\" width=\"700\" height=\"400\" frameborder=\"0\" scrolling=\"no\" allowfullscreen=\"allowfullscreen\" data-mce-fragment=\"1\"><span data-mce-type=\"bookmark\" style=\"display: inline-block; width: 0px; overflow: hidden; line-height: 0;\" class=\"mce_SELRES_start\">\ufeff<\/span><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<hr \/>\n<h4 content_id=\"validation\" class=\"toc__permalink\" content_id=\"validation\" class=\"toc__permalink\"  id=\"VALIDATION\"><strong>Validation<\/strong><\/h4>\n<p>An excellent way of validating simulations is by comparing them to research papers which are relevant. Since the Ahmed body is so widely studied and used as validation, it is not difficult to find supporting evidence. For this tutorial, the information gathered from the simulation will be compared to \u201cEmbedded Large Eddy Simulation of Flow around the Ahmed Body\u201d by Domenico Caridi done in ANSYS FLUENT. Below is a contour of the pressure on the rear surface of the Ahmed body. This can be compared to our model by creating a similar contour in our simulation.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-157281\" src=\"\/knowledge\/wp-content\/uploads\/sites\/4\/2022\/08\/HG203.png\" alt=\" width=\"616\" height=\"442\" \/><\/p>\n","protected":false},"template":"","class_list":["post-160152","topic","type-topic","status-publish","hentry","topic-tag-aim-tutorial","topic-tag-discovery-aim","topic-tag-fluids"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_last_active_time":["09-13-2022  20:20:00"],"_bbp_forum_id":["159552"],"_btv_view_count":["4104"],"family":[""],"application_name":[""],"product_version":[""],"_bbp_likes_count":["1"]},"test":"watchlearnansys-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/160152","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/160152\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=160152"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}