{"id":319760,"date":"2023-11-28T12:06:12","date_gmt":"2023-11-28T12:06:12","guid":{"rendered":"\/forum\/forums\/topic\/simulating-an-orbital-shaker\/"},"modified":"2024-03-15T06:28:33","modified_gmt":"2024-03-15T06:28:33","slug":"simulating-an-orbital-shaker","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/simulating-an-orbital-shaker\/","title":{"rendered":"Simulating an orbital shaker"},"content":{"rendered":"<p>Hi,<\/p>\n<p>I would like to ask about the steps in how one can simulate the rotational motion of a CFD model.<\/p>\n<p>&nbsp;<\/p>\n<p>Context:<\/p>\n<p>Geometrically the well plate model has a diameter of <strong>34.8mm<\/strong> and a total height of <strong>10mm<\/strong>. The medium inside is of a height of <strong>2mm<\/strong>.&nbsp;<\/p>\n<p>I have made a O-grid structured mesh representing a well plate that I have added resolution to the base and wall through a combination of adding a bias factor from the edge of the wall radially moving towards the centre and adding inflation layers from the base of the well plate toward the center. I am sufficiently certain the mesh itself is of good quality. This is important for the context of collecting wall shear stress at the edge and base of the well plate.&nbsp;<\/p>\n<p>Nodes: 492,280<\/p>\n<p>Elements: 471,630<\/p>\n<p>Aspect ratio: 3.4165 average (follows the recommended &lt; 5, but is expected due to inflation layers)<\/p>\n<p>Skewness: 0.02715 average (relatively close to 0)<\/p>\n<p>Orthogonal quality: 0.9917 average (relatively close to 1)<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/11\/28-11-2023-1701170642-mceclip0.png\" width=\"353\" height=\"312\"><\/p>\n<p>&nbsp;<\/p>\n<p>The model follows a VOF model with laminar flow consisting of 2 fluid phases of the liquid medium and air with the respective dynamic viscosity and density&nbsp;<strong>(0.78e-03 Kg\/ms and 1003 Kg\/m3 for the liquid meidum and 1.8688e-05 Kg\/ms and 1.1115 Kg\/m3 for air).&nbsp;<\/strong>The solid is modelled as the standard aluminium in the Ansys library with a density of <strong>2719 Kg\/m3.<\/strong>&nbsp;<\/p>\n<p>Named expressions for the X and Y domains have already been created and the Z domain follows gravity <strong>(-9.81m\/s2)<\/strong> and applied accordingly.&nbsp;<\/p>\n<p>The original experiment as shown by the image below shows that the the orbital shaking motion follows an orbital radius, a, of <strong>5mm<\/strong> and an angular velocity, &omega;,&nbsp; of <strong>150rpm<\/strong> (or <strong>15.707963 rad\/s<\/strong>). How would i simulate the swirling motion with these 2 parameters during the setup phase of Ansys.&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.researchgate.net\/publication\/324117107\/figure\/fig1\/AS:621114724192257@1525096698268\/Sketch-of-an-orbital-shaker-with-a-cylindrical-container-a-Definition-sketch-of-the.png\" alt=\"Sketch of an orbital shaker with a cylindrical container. (a)... | Download  Scientific Diagram\" width=\"560\" height=\"220\"><\/p>\n<p>&nbsp;<\/p>\n<p>Question 1: I believe this can be done in the Cell Zone conditions tab but I am unsure as to how to do this?<\/p>\n<p>Context:<\/p>\n<p>The model also has 2 main boundary conditions with the wall (named selections: wall) having a no-slip condition and the outlet (named selections: top) being set as a pressure outlet. A free surface level method is used with the specifications of the total well plate height and fluid medium height below:<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/11\/28-11-2023-1701172163-mceclip1.png\"><\/p>\n<p>Question 2: Is the Inlet boundary condition required? as the inlet currency is set as the (named seletions: base) which is not accurate from the orbital shaking experiment. I believe the liquid medium should already be inside the well plate and not coming through an inlet. Do i have to change this to an inteface in the boundary conditions?<\/p>\n","protected":false},"template":"","class_list":["post-319760","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["303164","199","180752"],"_bbp_author_ip":["23.52.43.16"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["517"],"_bbp_topic_status":["answered"],"_bbp_likes_count":["0"],"_bbp_topic_id":["319760"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","180752","303164"],"_bbp_voice_count":["3"],"_bbp_reply_count":["8"],"_bbp_last_reply_id":["367775"],"_bbp_last_active_id":["367775"],"_bbp_last_active_time":["2024-05-21 09:03:16"]},"test":"lingesh001suss-edu-sg"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/319760","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/319760\/revisions"}],"predecessor-version":[{"id":357212,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/319760\/revisions\/357212"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=319760"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}