{"id":389489,"date":"2024-10-14T12:33:15","date_gmt":"2024-10-14T12:33:15","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/boundary-conditions-for-single-moving-reference-frame-in-6-degrees-of-freedom\/"},"modified":"2024-10-14T12:33:15","modified_gmt":"2024-10-14T12:33:15","slug":"boundary-conditions-for-single-moving-reference-frame-in-6-degrees-of-freedom","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/boundary-conditions-for-single-moving-reference-frame-in-6-degrees-of-freedom\/","title":{"rendered":"Boundary conditions for single moving reference frame in 6 degrees of freedom"},"content":{"rendered":"

<p>Hi Yall,<\/p><p>I am studying dynamic stability derivates of aerospace vehicles. I am trying to set up an analysis that has the following steps:<\/p><\/p>\n

    \n
  1. Steady initial conditions with the local frame not moving relative to the global frame (this works fine)<\/li>\n
  2. I then need to run a transient study where I pitch, roll, and translate my vehicle.<\/li>\n<\/ol>\n

    <p>I have successfully achieved my results using dynamic meshing or using a sliding mesh approach for the rotations. <\/p><p>However, I am trying to increase my computational efficiency as I need to run many such cases. I am trying to run my case using a single moving reference frame for the entire domain, as sketched below in 2d. Doing so, however, produces very weird results. I have sizeable static pressure variations across my domain in the far field. <\/p><p>I am currently using the pressure far field for my entire boundary condition, with a constant Mach and constant direction. Additionally, I activated the frame motion for my entire domain and set a constant rotation and a constant translation.<\/p><p> Am I approaching this correctly? Should I instead define things as moving meshes? If possible, I’d like to avoid the need to use dynamic or sliding meshes.<\/p><p>Additionally, I’ve attached a picture of a constant rotation-only vector and pressure field. In this case, the frame rotates counterclockwise. Thank you for your time!<\/p><p>\"\"<\/p><p>\"\"<\/p><\/p>\n","protected":false},"template":"","class_list":["post-389489","topic","type-topic","status-publish","hentry","topic-tag-fluent","topic-tag-moving-reference-frame-2","topic-tag-rigid-body","topic-tag-simulation","topic-tag-transient"],"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