{"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":"

Hi,<\/p>\n

I would like to ask about the steps in how one can simulate the rotational motion of a CFD model.<\/p>\n

 <\/p>\n

Context:<\/p>\n

Geometrically the well plate model has a diameter of 34.8mm<\/strong> and a total height of 10mm<\/strong>. The medium inside is of a height of 2mm<\/strong>. <\/p>\n

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. <\/p>\n

Nodes: 492,280<\/p>\n

Elements: 471,630<\/p>\n

Aspect ratio: 3.4165 average (follows the recommended < 5, but is expected due to inflation layers)<\/p>\n

Skewness: 0.02715 average (relatively close to 0)<\/p>\n

Orthogonal quality: 0.9917 average (relatively close to 1)<\/p>\n

<\/p>\n

 <\/p>\n

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 (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). <\/strong>The solid is modelled as the standard aluminium in the Ansys library with a density of 2719 Kg\/m3.<\/strong> <\/p>\n

Named expressions for the X and Y domains have already been created and the Z domain follows gravity (-9.81m\/s2)<\/strong> and applied accordingly. <\/p>\n

The original experiment as shown by the image below shows that the the orbital shaking motion follows an orbital radius, a, of 5mm<\/strong> and an angular velocity, ω,  of 150rpm<\/strong> (or 15.707963 rad\/s<\/strong>). How would i simulate the swirling motion with these 2 parameters during the setup phase of Ansys. <\/p>\n

\"Sketch<\/p>\n

 <\/p>\n

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

Context:<\/p>\n

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>\n

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":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t