{"id":367045,"date":"2024-05-16T08:30:49","date_gmt":"2024-05-16T08:30:49","guid":{"rendered":"\/forum\/forums\/topic\/ansys-fluent-rotate-boundary-change-wind-direction\/"},"modified":"2024-05-16T08:30:49","modified_gmt":"2024-05-16T08:30:49","slug":"ansys-fluent-rotate-boundary-change-wind-direction","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ansys-fluent-rotate-boundary-change-wind-direction\/","title":{"rendered":"Ansys fluent rotate boundary\/change wind direction"},"content":{"rendered":"

Hi!<\/p>\n

I am new to Ansys Fluent and have a technical question. I want to carry out a wind engineering analysis of a structure. I have previous results of wind tunnel tests for multiple wind directions. I want to analyze the same wind directions numerically in Ansys. The current method I applied is that I set the boundary conditions in every new wind direction by changing the direction of the velocity vectors in the boundary inlets. I used a structured mesh where I use hexahedral elements in the outer domain parallel to the x-y axes, and an inner domain where I make a transition between the structutred mesh and th inflation layer around the surface.<\/p>\n

I know that I can apply an alternative method by keeping the same boundary conditions and rotating the structure inside the flow domain (I think this is called an O-grid, but I’m not sure). How can I do this? My structure is a 3D tensile membrane, so the geometry is complex in terms of its doubly curved surface. I generated the geometry of the membrane surface in a CAD software, and imported that into desgin modeler. Then I do the enclosure and everything else in Ansys. I want to keep the structured mesh that I introduced in the previous section.<\/p>\n

Do you have any advice or recommendations? Which method is better? The rotating method would spare me some computational capacity since the flow domain can be smaller. But I found somewhere that the interface can cause inaccuracies compared to the fix mesh.<\/p>\n

I only found example problems online (images, descriptions, videos) about 2D problems where they rotated the object.<\/p>\n

 <\/p>\n

Sorry for the long question. I attach photos about the current set up of the mesh.\"\"<\/p>\n

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